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Leading UK Companies for Cross-Platform App Development That Actually Deliver

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    Targets we’ve achieved:
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    AI Summary
    Sergii Steshenko
    CEO & Co-Founder @ Lengreo

      Finding a good dev team to build your app across platforms isn’t just about picking a framework or staying within budget. It’s about working with people who understand what you’re trying to build – and why. You need developers who know how to ship for iOS and Android without duct-taping everything together, and who get the real-world trade-offs that come with going cross-platform. We’ve rounded up some solid UK-based firms using Flutter, React Native, Xamarin, and a few other tools that go beyond just writing code. These teams help get working products into real users’ hands.

      1. LenGreo

      1. LenGreo

      Lengreo helps companies in the UK build and scale cross-platform applications by combining solid tech execution with a clear understanding of business goals. Whether it’s Flutter, React Native, or a more tailored stack, we approach mobile app development the same way we handle our digital strategy work: no fluff, just results. For us, building apps isn’t about ticking boxes. It’s about launching tools people actually use.

      Cross-platform app development is one of the areas where we work closely with UK clients, particularly those in SaaS, biotech, and IT. What makes this work go smoothly is our ability to integrate into existing teams, adjust to real-world deadlines, and keep communication transparent throughout. We’re not fans of bloated features or slow processes – we’d rather ship something that’s lean, usable, and easy to scale.

       

      Key Highlights:

      • Active cross-platform builds for UK companies
      • Feels like an embedded team, not just outsourced work
      • Strong track record in SaaS, healthcare, and deep tech
      • Knows how to build without bloating
      • Offices in Amsterdam and Kyiv, with in-person EU availability

       

      Services:

      • Cross-platform mobile apps (Flutter, React Native)
      • Custom backend and web development
      • Product design and prototyping
      • SEO and demand generation
      • Lead generation and appointment setting

       

      Contact Information:

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      2. Magora

      2. Magora

      Magora’s based in London and works with UK businesses that want to ship cross-platform apps without running two separate dev tracks. They use frameworks like Flutter and React Native and usually start with discovery sessions and scoping – so the team actually knows what they’re building before jumping into code.

      They’ve worked in sectors like logistics, healthcare, and enterprise platforms. Their projects often involve backend integration and full lifecycle support, from UI mockups to QA and launch. The team includes in-house analysts, designers, developers, and testers – all on an agile loop.

       

      Key Highlights:

      • London-based with full-cycle UK delivery
      • Runs on Flutter and React Native
      • Good at mapping and scoping projects early
      • Supports launch and maintenance
      • Works with both new ventures and mature teams

       

      Services:

      • Cross-platform app development
      • iOS and Android app development
      • UI/UX design and prototyping
      • API integration and backend services
      • Maintenance and version updates

       

      Contact Information:

      • Website: magora-systems.com
      • E-mail: info@magora.co.uk
      • Facebook: www.facebook.com/magora.systems
      • Twitter: x.com/magora_systems
      • LinkedIn: www.linkedin.com/company/magora
      • Instagram: www.instagram.com/magora_team
      • Address: Office 4.01, 4th Floor The Tea Building, 56 Shoreditch High St London E1 6JJ
      • Phone: +44 20 7183 5820

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        3. Hidden Brains

        3. Hidden Brains

        Hidden Brains works with UK clients that need mobile apps to work across iOS, Android, and sometimes even Windows – without rewriting everything. They use a mix of Flutter, Xamarin, Ionic, and React Native depending on the project. It’s not one-size-fits-all, and they’re pretty good at adapting to whatever legacy setup you’ve already got.

        They’ve got a UK office in Hampshire and tend to work with businesses in logistics, education, and retail. If you’ve got an old app that needs modernizing or you’re trying to move from native to cross-platform, this is one of those teams that can handle the transition without drama.

         

        Key Highlights:

        • UK office in Hampshire
        • Multi-framework delivery: Flutter, Xamarin, Ionic, React Native
        • Handles rebuilds and migrations
        • Works across logistics, education, retail

         

        Services:

        • Cross-platform app development
        • UI/UX design for multi-platform interfaces
        • Cross-platform migration and rebuild
        • Maintenance and feature expansion
        • Technical consulting and planning

         

        Contact Information:

        • Website: www.hiddenbrains.co.uk
        • E-mail: biz@hiddenbrains.com
        • Facebook: www.facebook.com/HiddenBrains
        • Twitter: x.com/HiddenBrains
        • LinkedIn: www.linkedin.com/company/hiddenbrains-infotech
        • Address: Unit P Hunting Gate, East Portway, Andover, Hampshire, SP10 3ER, UK
        • Phone: +44 (0)20-7993-2188
        4. Mobile App Developers Ltd (MAD)

        4. Mobile App Developers Ltd (MAD)

        Mobile App Developers Ltd – yeah, they go by MAD – builds cross-platform apps that don’t feel clunky or stitched together. Their go-to framework is Flutter, and they take on work from early-stage startups to large businesses across the UK.

        They’re London-based and tend to work in industries like finance, food, and eCommerce. Their apps are built to scale – meaning you can roll something out quickly and build on top of it later. They also help with migration, updates, and getting your app store presence sorted post-launch.

         

        Key Highlights:

        • London HQ with UK-wide focus
        • Solid Flutter shop
        • Flexible scope options – start small, scale later
        • Post-launch support and migration help

         

        Services:

        • Cross-platform mobile apps
        • Multi-device UI design
        • Testing and store support
        • Migration from native setups

         

        Contact Information:

        • Website: mobileappdevelopersltd.co.uk
        • E-mail: ideas@mobileappdevelopersltd.co.uk
        • Facebook: www.facebook.com/people/Mobile-App-Developers/100083120331640
        • Twitter: x.com/Mad_uk2023
        • LinkedIn: www.linkedin.com/company/mobile-app-developers-uk
        • Instagram: www.instagram.com/mobileappsuk
        • Address: 2, Frederick Street, Kings Cross, London, WC1X 0ND, England, UK.
        • Phone: +442045721212
        5. Devfan

        5. Devfan

        Devfan works with UK businesses that just want to keep things simple – build once, run everywhere, and don’t stress about platform quirks. They mostly stick with Flutter and React Native and are pretty good at making sure apps look and feel consistent whether they’re opened on a phone, tablet, or even desktop.

        They tend to click with fast-moving startups and growing teams that don’t have time to manage separate iOS and Android builds. Devfan’s the kind of team that doesn’t disappear after launch either – they’ll stick around for updates, bug fixes, and tweaks as your product grows. Based in London, they offer a way to get to market faster without the whole platform-lock headache.

         

        Key Highlights:

        • Cross-platform builds using Flutter and React Native
        • Consistent UX across devices
        • Post-launch help with updates and fixes
        • Works well for MVPs and long-term builds

         

        Services:

        • Cross-platform mobile app development
        • Hybrid app development
        • Responsive UI/UX design
        • App maintenance and updates

         

        Contact Information:

        • Website: devfan.co.uk
        • E-mail: james@devfan.co.uk
        • Address: 20 Wenlock Road, London, N1 7GU, England
        6. Nimble AppGenie

        6. Nimble AppGenie

        Nimble AppGenie builds cross-platform apps for UK companies that need to hit iOS and Android at the same time – without doubling the dev work. They use a mix of tools like Flutter, React Native, and Ionic, and they’ve delivered projects in fintech, edtech, fitness, and a few other fast-moving sectors.

        They’re also pretty open to newer tech – AI, blockchain, IoT – if your project needs it. A lot of their work involves rebuilding existing apps or helping teams get to MVP faster with something that won’t fall apart under pressure. The whole process is modular, and they keep it transparent, so you’re never in the dark about what’s happening.

         

        Key Highlights:

        • Projects across fintech, fitness, edtech
        • Skilled in AI, IoT, and modern tech stacks
        • Handles full dev cycle from design to QA
        • Supports rebuilds and migrations
        • Flexible team setups for UK clients

         

        Services:

        • Cross-platform app development (React Native, Flutter, Ionic)
        • App design and prototyping
        • Legacy app rebuilds and migration
        • Post-launch support and optimization
        • App integrations and QA

         

        Contact Information:

        • Website: www.nimbleappgenie.com
        • E-mail: contact@nimbleappgenie.com
        • Facebook: www.facebook.com/nimbleappgenielondon
        • Twitter: x.com/nimbleappgenie
        • LinkedIn: www.linkedin.com/company/nimble-appgenie
        • Instagram: www.instagram.com/nimbleappgenie
        • Address: 27 Old Gloucester Street, London, WC1N 3AX, United Kingdom
        • Phone: +44 20 8123 3976
        7. Revatics

        7. Revatics

        Revatics helps UK companies build apps that run smoothly across platforms without wasting dev hours or budget. Their go-to setup usually starts with one shared codebase (Flutter, Xamarin, React Native), which they turn into apps that behave reliably across phones, tablets, and browsers.

        They’re not just a build-and-done shop either – they handle everything from bug fixes and feature rollouts to QA and user testing. The team works closely with clients throughout the build, and their hands-on approach means fewer surprises and smoother delivery.

         

        Key Highlights:

        • UK-based team with hands-on delivery
        • Shared codebase builds to speed up timelines
        • Consistent UX across devices
        • Handles QA, testing, and ongoing updates

         

        Services:

        • Cross-platform app development
        • Progressive Web App (PWA) builds
        • Multi-device UI/UX design

         

        Contact Information:

        • Website: www.revatics.co.uk
        • E-mail: contact@revatics.co.uk
        • Facebook: www.facebook.com/revatics
        • LinkedIn: www.linkedin.com/company/revatics
        • Instagram: www.instagram.com/revatics.official
        • Address: Suite 1227 Unit 3A, 34-35 Hatton Garden, Holborn, London EC1N 8DX
        • Phone: +44 20 8040 4343
        8. Intelivita

        8. Intelivita

        Intelivita works with UK companies that need mobile apps to behave the same across platforms – without building everything twice. They’re solid with Flutter, Xamarin, and Ionic, and they usually kick things off with a bit of business analysis and prototyping before diving into development. Keeps things focused and avoids scope creep.

        They’ve got offices in Leeds, Manchester, and London, so they’re easy to reach if you’re UK-based. Their clients tend to come from eCom, healthcare, and logistics – industries where speed and cross-platform consistency matter. They handle everything from initial planning to post-launch fixes and scale-ups.

         

        Key Highlights:

        • Teams in Leeds, Manchester, and London
        • Covers strategy, development, and long-term support
        • Works with Flutter, Ionic, Xamarin
        • Knows how to scale in fast-moving industries
        • Flexible delivery options

         

        Services:

        • Cross-platform app builds
        • Multi-device UI/UX design
        • Post-launch testing and updates
        • Backend integration
        • Business analysis and prototyping

         

        Contact Information:

        • Website: www.intelivita.co.uk
        • E-mail: sales@intelivita.co.uk
        • Facebook: www.facebook.com/intelivita
        • Twitter: x.com/Intelivita
        • LinkedIn: www.linkedin.com/company/intelivita
        • Instagram: www.instagram.com/intelivita
        • Address: Kemp House, 152-160 City Rd, London, EC1V 2NX, UK
        • Phone: +44 161 504 3600
        9. iTechniq

        9. iTechniq

        iTechniq helps UK teams build cross-platform apps that work reliably without draining time or budget. They mostly use Flutter, React Native, and Ionic, and if needed, they’ll tie that into custom backend systems to keep things smooth. The process is pretty straightforward: discovery sessions, design planning, development, testing – nothing bloated or overcomplicated.

        Most of their clients fall into two camps: early-stage teams trying to move fast, and more established businesses that want consistent performance without juggling multiple codebases. They’re based in Manchester and prefer long-term partnerships where everyone’s on the same page rather than one-off dev sprints.

         

        Key Highlights:

        • UK-based team working with Flutter and React Native
        • Helps unify iOS and Android builds into a single codebase
        • Focus on smooth UX and clean backend integration
        • Strong QA support baked into the workflow

         

        Services:

        • Cross-platform app development
        • UI/UX design and prototyping
        • Native-like app performance tuning
        • API and cloud service integration
        • QA and post-deployment support

         

        Contact Information:

        • Website: itechniq.com
        • E-mail: hello@itechniq.com
        • Facebook: www.facebook.com/people/ITechniq/61560394077237
        • Twitter: x.com/iTechniq_labs
        • LinkedIn: www.linkedin.com/company/itechniq
        • Instagram: www.instagram.com/itechniq_labs
        • Address: 24 Caddie Road, Manchester, M38 9DD
        • Phone: (+44) 0744 260 3925
        10. Devstree

        10. Devstree

        Devstree builds apps that run reliably across both iOS and Android – no separate builds, no duplicated effort. Flutter and React Native are their tools of choice, and they usually start with wireframes and planning before diving into dev and cloud integration. It’s a setup that works well for UK teams that want structure without the overhead.

        They’re based in Leicester and offer different engagement models – whether you need someone part-time to join your team or a fully managed build. After launch, they’ll stick around for updates, support, and scaling if needed. Their clients often come from healthcare, education, and on-demand services.

         

        Key Highlights:

        • UK delivery with a team in Leicester
        • Uses Flutter and React Native to speed up builds
        • Offers both dedicated devs and full project teams
        • Strong on UI consistency and fast turnaround
        • Good fit for healthcare and education projects

         

        Services:

        • Cross-platform mobile app development
        • UI/UX planning and design
        • Cloud and backend development
        • QA and ongoing support

         

        Contact Information:

        • Website: www.devstree.uk
        • E-mail: info@devstree.uk
        • Facebook: www.facebook.com/devstreeitsolutionsuk
        • Twitter: x.com/DevstreeUK
        • LinkedIn: www.linkedin.com/company/devstreeuk
        • Instagram: www.instagram.com/devstree.uk
        • Address: 8, Overing Close, Leicester LE47QS, UK
        • Phone: +44 7404 650992
        11. London App Development

        11. London App Development

        London App Development helps UK clients launch mobile apps that just work – across iOS and Android, without all the code duplication. They use Flutter, React Native, and Xamarin to build cross-platform tools that look and feel consistent no matter what device your users are on.

        The team’s based in London and works across industries like fintech, healthcare, logistics, and education. They don’t just build apps either – they offer consulting, design, web versions, and support after launch. Whether you’re just getting your MVP off the ground or scaling something bigger, they’ve got it covered.

         

        Key Highlights:

        • London-based with national reach
        • Works with Flutter, React Native, and Xamarin
        • Covers design, development, consulting, and web apps
        • Helps ship MVPs and long-term products

         

        Services:

        • Cross-platform mobile and web app development
        • MVP and proof-of-concept builds
        • Multi-platform UI/UX design
        • Maintenance and app updates
        • AI and consulting services

         

        Contact Information:

        • Website: londonappdevelopment.co.uk
        • E-mail: sales@londonappdevelopment.co.uk
        • Twitter: x.com/london_app_dev
        • LinkedIn: www.linkedin.com/company/london-app-development
        • Address: Kemp House 152-160, City Road, London, EC1V 2NX, United Kingdom
        • Phone: +44 203 467 7471
        12. Strivemindz

        12. Strivemindz

        Strivemindz builds mobile apps for companies that want to move fast without sacrificing quality. They work with tools like Flutter, Kotlin, and React Native to deliver cross-platform apps that run the same way on Android and iOS – saving time and budget in the process.

        They’re based in Bristol and handle everything from the first idea through to testing, launch, and post-launch support. Their work spans startups and larger businesses, and they’re especially comfortable in finance, education, and retail. If you need extra hands, they also offer dedicated developer hiring and custom integrations – like chat or GPS features.

         

        Key Highlights:

        • UK office in Bristol with global delivery
        • Builds with Flutter, Kotlin, and React Native
        • End-to-end app lifecycle support
        • Handles complex feature integration (chat, GPS, etc.)

         

        Services:

        • Cross-platform and hybrid app development
        • UI/UX design and wireframing
        • QA and bug testing
        • App updates and performance tweaks

         

        Contact Information:

        • Website: www.strivemindz.com
        • E-mail: sales@strivemindz.com
        • Facebook: www.facebook.com/strivemindz
        • Twitter: x.com/Strivemindz
        • LinkedIn: www.linkedin.com/company/strivemindz
        • Instagram: www.instagram.com/strivemindz
        • Phone: +44-117 325 0777
        13. Chimpare

        13. Chimpare

        Chimpare helps UK companies build apps that run across all major platforms – without ballooning timelines or budgets. They use frameworks like Flutter, Kotlin, React Native, and Ionic to keep things efficient and avoid multiple codebases. From planning and design to development and testing, they cover the whole workflow.

        They’re based in Whiteley with a local contact in Nottingham, and they’re pretty flexible with delivery. Some clients go fixed-scope; others need long-term support. They also handle migrations from native apps and work across sectors like healthcare, retail, logistics, and finance.

         

        Key Highlights:

        • Whiteley HQ, Nottingham contact for UK clients
        • Uses Flutter, Kotlin, React Native, and Ionic
        • Flexible build options and long-term support
        • Handles migrations and redesigns

         

        Services:

        • Cross-platform app development
        • UI/UX design for multiple platforms
        • Cross-platform QA and testing
        • Maintenance and technical support
        • Migration from native to cross-platform

         

        Contact Information:

        • Website: chimpare.com
        • E-mail: hello@chimpare.com
        • Facebook: www.facebook.com/people/Chimpare-Designs/61573807152250
        • LinkedIn: www.linkedin.com/company/chimpare-com
        • Instagram: www.instagram.com/chimpare_design
        • Address: Solent Business Park, 4500 parkway, Whiteley Fareham, PO15 7AZ, United Kingdom
        • Phone: +44 0115 894 4772
        14. CMARIX

        14. CMARIX

        CMARIX works with UK businesses that want apps that don’t care what platform they’re running on. They’re flexible when it comes to tools – Flutter, React Native, Xamarin, Ionic, Kotlin – you name it. Whether it’s a lightweight app for consumers or something a bit more enterprise-level, they’ve probably built it.

        They’re set up to support both product companies and service-based teams, and they’re big on cutting down the usual platform-by-platform headaches. You can also hire developers directly through them if you want to keep things more in-house without actually hiring in-house. From UI/UX to dev, QA, and post-launch tweaks, they cover the whole cycle.

         

        Key Highlights:

        • UK presence with local delivery teams
        • Builds with Flutter, React Native, Ionic, Xamarin, and more
        • Handles both full-scope projects and team extension
        • Focus on long-term delivery, not just shipping something and vanishing

         

        Services:

        • Cross-platform and hybrid mobile app development
        • Flutter and React Native builds
        • Progressive Web Apps (PWAs)
        • UI/UX design and prototyping

         

        Contact Information:

        • Website: www.cmarix.com
        • E-mail: biz@cmarix.com
        • Facebook: www.facebook.com/cmarixinfotech
        • Twitter: x.com/cmarixinfotech
        • LinkedIn: www.linkedin.com/company/cmarix
        • Instagram: www.instagram.com/cmarixinfotech
        • Address: 45 Queens Road, Aberdeen UK, AB15 4ZN
        • Phone: +1 415-704-4242
        15. SSK Business Solutions

        15. SSK Business Solutions

        SSK helps UK companies build apps that work on both iOS and Android without building everything twice. They stick to shared-code frameworks like React Native, Xamarin, PhoneGap, and NativeScript. Whether it’s an internal app, a fast-track MVP, or something more client-facing, they focus on keeping the experience close to native but without the extra budget burden.

        Their team’s based in Walsall, and they’ve worked on everything from geo-based apps to enterprise tools and eCommerce builds. They also plug into open-source frameworks like Sencha or jQuery on the backend. Once the app’s live, they stay on for maintenance, updates, and testing.

         

        Key Highlights:

        • Walsall-based team with UK-wide delivery
        • Builds hybrid apps with frameworks like Xamarin and PhoneGap
        • Keeps dev time and cost down with shared code
        • Offers backend integrations and UI/UX design

         

        Services:

        • Cross-platform app development
        • React Native, Xamarin, and PhoneGap builds
        • UI/UX design for hybrid apps
        • Backend integration with mobile frameworks

         

        Contact Information:

        • Website: sskservices.co.uk
        • E-mail: info@sskservices.co.uk
        • Address: 246 Green Lane, Walsall, WS28HS, UK
        • Phone: +447447445104
        16. Sandycode

        16. Sandycode

        Sandycode keeps it simple: they build apps that run across iOS and Android using one codebase – usually Flutter or React Native. The team’s based in Waterlooville, and they’re focused on getting quality apps into the world quickly, without cutting corners. Everything they build plays nicely with Apple and Google’s guidelines, so no weird behavior on launch day.

        They tend to work with startups and small to mid-sized businesses that want to launch something clean, fast, and stable. Beyond the build, they also help with UI/UX design, MVP launches, and updating older apps that need a bit of modernizing.

         

        Key Highlights:

        • UK-based in Waterlooville
        • Builds with Flutter and React Native
        • Focuses on clean, responsive design and app stability
        • Good fit for MVPs, single-page apps, and modern rebuilds

         

        Services:

        • Cross-platform app development
        • React Native and Flutter builds
        • UI/UX design for multi-platform apps
        • MVP and app modernization services

         

        Contact Information:

        • Website: www.sandycode.co.uk
        • E-mail: info@sandycode.co.uk
        • LinkedIn: www.linkedin.com/company/sandycodeuk
        • Address: Unit 29 Highcroft Industrial Estate, Enterprise Road, Waterlooville, United Kingdom, PO8 0BT
        • Phone: +44 (0) 2477 145 858
        17. Theodo

        17. Theodo

        Theodo builds cross-platform apps with React Native and Flutter – and they do it fast. Whether you’re a startup or one of those bigger FTSE 100 names, they help teams get apps live quicker by reusing code across platforms. They’re also into building universal apps that work across mobile and web without sacrificing that native feel.

        A lot of their devs have strong web backgrounds, so if you’re aiming for something scalable and maintainable without siloing teams by platform, they’re worth talking to. They also bake strategy into the process, helping clients streamline across teams and reduce unnecessary duplication.

         

        Key Highlights:

        • Strong UK team with a web-first mindset
        • Builds mobile apps that work across iOS, Android, and web
        • Focuses on speed, shared code, and keeping teams aligned
        • Experience across industries – from startups to enterprise

         

        Services:

        • Cross-platform app development
        • Universal app builds (web + mobile)
        • React Native and Flutter development
        • Native iOS/Android support where needed

         

        Contact Information:

        • Website: www.theodo.co.uk
        • E-mail: contact-uk@theodo.com
        • Twitter: x.com/theodo_uk
        • LinkedIn: www.linkedin.com/company/theodo-uk
        • Address: 20 Baltic Street East, London, EC1Y 0UL
        18. Auxano Global Services

        18. Auxano Global Services

        Auxano Global Services builds cross-platform apps with a flexible setup that adjusts to how your team works. Whether you need someone part-time or a dedicated squad, their UK delivery model makes it pretty easy to scale up or down. They’ve got a strong focus on UI/UX and custom builds – not the cookie-cutter stuff – and lean on Flutter and AI where it makes sense.

        They’re one of those teams that doesn’t walk away after the app goes live either. Post-launch support is part of the deal, especially for companies working in tight or competitive markets. They’ve done quite a bit in wearables too, including apps with remote monitoring baked in.

         

        Key Highlights:

        • UK-based delivery with flexible hiring options
        • Good track record in wearable and enterprise apps
        • Hands-on with AI features and real-device performance
        • Support continues after launch – no ghosting

         

        Services:

        • Custom cross-platform mobile and web development
        • Wearable app development
        • AI-powered mobile features
        • UI/UX for multi-platform projects
        • QA, testing, and ongoing support

         

        Contact Information:

        • Website: auxanoglobalservices.co.uk
        • Facebook: www.facebook.com/AuxanoGlobalServicesCom
        • Twitter: x.com/AuxanoGlobal
        • Instagram: www.instagram.com/auxanoglobalservices
        • Address: 18 Bridge RoadTwickenham TW3 1SG
        • Phone: +1 209 736 5046
        19. Mobile App Experts

        19. Mobile App Experts

        Mobile App Experts is based in Greater London and focuses on building cross-platform apps that don’t waste time duplicating work across platforms. They follow a pretty structured workflow – from research to testing to deployment – and once your app is ready, you actually own everything: source code, servers, all of it.

        Their team works with startups and mid-sized businesses, offering everything from UI/UX refinement to custom features. If you’re still figuring out if cross-platform is even the right call, they also offer advisory support without the fluff. Straight answers, technical clarity.

         

        Key Highlights:

        • Based in Greater London, focused on UK clients
        • Clear, structured delivery process
        • Full handover of app assets post-launch
        • Designs built to work cleanly across Android and iOS

         

        Services:

        • Custom cross-platform app development
        • UI/UX design for multi-device support
        • Android and iOS mobile development
        • Mobile app consulting

         

        Contact Information:

        • Website: www.mobileappexperts.co.uk
        • E-mail: hello@mobileappexperts.co.uk
        • Facebook: www.facebook.com/MobileAppExpertsUK
        • Twitter: x.com/MobAppExpert
        • LinkedIn: www.linkedin.com/company/mobileapp-experts
        • Address: 3 Claire Gardens, HA74EH, Stanmore, Greater London, U.K.
        • Phone: +44 744 026 1268
        20. WeDoWebApps UK

        20. WeDoWebApps UK

        WeDoWebApps UK takes a practical approach to cross-platform app development – no big talk, just focused delivery. They build mobile apps that work across iOS and Android using React Native and Flutter, and they keep everything in-house from design to testing, which means fewer handoffs and delays.

        Their process is built around structure and iteration. Early prototyping, user feedback, and test-driven development are all part of the mix. They’ve worked with clients from a bunch of different industries and tend to treat mobile and web as one ecosystem, not two separate things to bolt together later.

         

        Key Highlights:

        • UK delivery team that keeps things under one roof
        • Strong on design consistency across devices
        • Builds with Flutter and React Native
        • Post-launch support built into the process

         

        Services:

        • Cross-platform app development
        • Mobile UI/UX design
        • Flutter and React Native builds
        • Backend development and API integration

         

        Contact Information:

        • Website: www.wedowebapps.co.uk
        • E-mail: sales@wedowebapps.co.uk
        • Facebook: www.facebook.com/wedowebappsltd
        • Twitter: x.com/wedowebappsuk
        • LinkedIn: www.linkedin.com/company/wedowebapps-ltd
        • Instagram: www.instagram.com/wedowebappsltd
        • Address: 2 Garrick Rd, London, UK
        • Phone: +44 788 330 8093

        Conclusion

        Cross-platform development isn’t just about saving time or checking off tech specs – it’s about building something that actually works across devices, for real users, without burning your budget or your team. Every company on this list approaches that balance a bit differently, but the goal’s the same: consistent UX, solid performance, and apps that scale without doubling the effort.

        AI Summary