Best Application Development Companies in the USA

At LenGreo, we focus on combining technology and marketing to support companies in growing their online presence and improving their digital performance. We provide services that range from digital strategy and SEO to web development and lead generation. With a distributed team and presence in both Europe and the USA, we work with clients across multiple industries, including software development and cyber security.

As part of our development offering, we deliver application development services for companies in the USA, supporting both business and technical teams in building user-centered websites and landing pages. This includes the full cycle from discovery and prototyping to development and quality assurance. We also assist in integrating marketing strategies and digital tools that align with the needs of each client, offering a structured yet flexible approach to project delivery.

Hoofdzaken:

• Offices in Amsterdam and Kyiv with international client base
• Provides application development services in the USA
• Works with B2B, SaaS, biotech, and software development companies
• Combines marketing and tech expertise under one structure
• Offers technical consulting and implementation alongside marketing
  

Services:

• Application and Website Development
• SEO en digitale marketing
• Lead Generation and Outreach
• Paid Ads and Campaign Management
• Vraaggeneratie
• Social Media and Content Management
• Strategy Consulting and Market Research
  

Contactgegevens:

• Website: Lengreo
• Contact Email: hallo@lengreo.com
• Telefoonnummer: +31 686 147 566
• LinkedIn: Lengreo
• Twitter: @Lengreo
• Instagram: @lengreo

Our cases

SEO for BIM & VDC Services Provider

PPC For Adult Content Platform

Biological Age Blood Testing Kit

10Pearls is a digital development company operating in multiple regions, including the United States. The company provides application development services, focusing on mobile platforms. Its work covers a range of technical and product development stages, including initial research, design, engineering, and post-launch support. The company builds applications across different industries and integrates features such as AI, cross-platform compatibility, and user experience optimization. Development processes include strategic planning, prototyping, native and cross-platform development, as well as support for wearables and gaming applications. Quality assurance and deployment planning are also part of their application lifecycle approach.

Hoofdzaken:

• Operates in the USA and several global locations
• Offers mobile application development including AI integration
• Focuses on user experience, quality assurance, and app performance
• Provides native and cross-platform development
• Covers wearable and gaming application development
  

Services:

• Product discovery and research
• Product roadmap and prototyping
• UI/UX-ontwerp
• AI app development
• Native and cross-platform app development
• Wearable and gaming app development
• In-app optimization
• Onderhoud en ondersteuning
• QA and mobile testing
• Deployment and go-to-market planning
  

Contactgegevens:

• Website: 10pearls.com
• Address: 8614 Westwood Center Dr, Ste 540 Vienna, VA 22182
• Phone: (703) 935-1919
• E-mail: info@10pearls.com
• LinkedIn: www.linkedin.com/company/10pearls
• Twitter: x.com/TenPearls
• Facebook: www.facebook.com/10Pearls

Utility is a digital product agency based in the USA that delivers custom application development services. The company develops mobile and web applications, working across the entire product lifecycle from initial strategy and planning to design, development, and growth optimization. Their services are structured around four main areas: technology, design, strategy, and growth. In application development, Utility works with both established enterprises and early-stage ventures, building solutions with a focus on functionality, infrastructure, user experience, and integration of AI and emerging technologies. In addition to software engineering, the company also provides support in product validation, user research, data-driven experimentation, and technical audits.

Hoofdzaken:

• Based in the USA with over a decade of operational history
• Works with startups and Fortune 500 companies
• Offers mobile app development alongside web and backend services
• Provides user experience design and AI integration
• Supports clients through strategy, technical audits, and growth planning
  

Services:

• Ontwikkeling van mobiele apps
• webontwikkeling
• Backend infrastructure
• AI and emerging technology integration
• UX and visual design
• Product validation and planning
• Technical audits
• Data analysis and growth experimentation
• Ongoing management and user retention
  

Contactgegevens:

• Website: utility.agency
• Address: 135 Madison Ave, 5th Floor, New York, NY 10016
• E-mail:  info@utility.agency
• LinkedIn: www.linkedin.com/company/utility-agency
• Twitter: x.com/Utility_agency
• Instagram: www.instagram.com/utility_agency

Progatix is a software development company based in the United States with a focus on mobile application development. The company operates across multiple U.S. cities and offers services for both iOS and Android platforms, as well as cross-platform and hybrid mobile apps. Development services are structured to support clients from early concept and consultation through deployment, testing, and long-term support. Progatix works across various industries and applies a range of frameworks and technologies, including Flutter, React Native, Kotlin, Swift, and others. Application development is aligned with a defined process that includes planning, design, development, and delivery, with added services in UI/UX design, app marketing, and technical support. The company also covers niche areas such as AR, wearable apps, and blockchain development.

Hoofdzaken:

• Headquartered in Florida with additional offices in New York, Chicago, and Karachi
• Offers services throughout the United States
• Provides mobile app development for Android, iOS, hybrid, and cross-platform needs
• Covers industry-specific app development for sectors such as healthcare, fintech, and education
• Applies a defined process covering planning, design, development, and deployment
  

Services:

• Android and iOS app development
• Cross-platform and hybrid app development
• Custom mobile app development
• UI/UX-ontwerp
• App testing and QA
• App deployment and store optimization
• Enterprise and startup app solutions
• Mobile app consulting
• Wearable, AR, and IoT app development
• Blockchain and dApp development
  

Contactgegevens:

• Website: progatix.com
• Address: 801 International Pkwy, Lake Mary, FL 32746
• Phone: +1 (321) 329-5439
• E-mail: info@progatix.com
• LinkedIn: www.linkedin.com/company/progatix
• Facebook: www.facebook.com/Progatix
• Instagram: www.instagram.com/progatix.inc

LimeGreen Apps is a mobile application development company based in the United States, offering services for startups, businesses, and enterprise clients. The company provides development for both Android and iOS platforms, as well as cross-platform solutions using various frameworks and technologies. LimeGreen Apps supports clients through the entire app lifecycle, including research, UI/UX design, backend development, deployment, and support. Their team works with clients across different industries and focuses on delivering mobile applications aligned with technical and user requirements. In addition to app development, the company also provides product strategy and system architecture services.

Hoofdzaken:

• Based in the USA, serving clients across industries
• Develops mobile apps for Android, iOS, and cross-platform use
• Offers full-cycle development from planning to post-launch support
• Supports both startups and established businesses
• Involved in system architecture, backend development, and UI/UX design
  

Services:

• Android and iOS mobile app development
• Cross-platform app development
• Product strategy and planning
• UI/UX design and prototyping
• Backend system development
• Quality assurance and app testing
• Post-launch maintenance and support
• API integrations and cloud solutions
  

Contactgegevens:

• Website: limegreenapps.com
• Address: 200 Park Ave #1700, New York, NY 10166, United States
• Phone:  +1 (877) 305-0317
• E-mail: info@limegreenapps.com
• LinkedIn: www.linkedin.com/company/limegreenapps
• Twitter: x.com/limegapps
• Facebook: www.facebook.com/Limegapps
• Instagram: www.instagram.com/limegapps

TekRevol is a mobile app development company operating in the United States, providing end-to-end services across a wide range of platforms and industries. The company develops native and cross-platform applications for iOS and Android, using frameworks like React Native and Flutter. TekRevol also supports wearable tech, embedded software, and game development. Their process includes concept validation, design, development, testing, and post-launch maintenance. Technical services cover API integration, real-time monitoring, scalable architecture, and security compliance. The company serves multiple sectors including healthcare, eCommerce, fintech, real estate, and education, and integrates technologies such as AI, blockchain, IoT, and AR/VR.

Hoofdzaken:

• U.S.-based company with offices in major cities including Houston, Chicago, and New York
• Delivers mobile apps for Android, iOS, cross-platform, and wearable devices
• Offers post-launch lifecycle management including updates and optimization
• Uses modern technologies including AI, AR/VR, IoT, and blockchain
• Supports enterprise and startup clients across different industries
  

Services:

• Android and iOS app development
• React Native and Flutter cross-platform development
• Wearable and embedded app development
• Mobile game development
• UI/UX-ontwerp
• App performance monitoring and scaling
• App store optimization and marketing support
• Custom API development and cloud integration
• AI-driven features and real-time analytics
• Ongoing maintenance, compliance updates, and feature enhancement
  

Contactgegevens:

• Website: www.tekrevol.com
• Address: 500 W 2nd St Suite 1900, Austin, TX 78701, United States
• Phone: +1 800-362-9239
• E-mail: info@tekrevol.com
• LinkedIn: www.linkedin.com/company/tekrevol
• Twitter: x.com/tekrevol
• Facebook: www.facebook.com/TekRevolOfficial
• Instagram: www.instagram.com/tekrevol

Closeloop is a mobile application development company based in the United States, offering custom development services for businesses across various industries. The company delivers native and cross-platform apps, as well as progressive web applications (PWAs). In addition to building new mobile apps, Closeloop supports clients through legacy system modernization, Bluetooth-enabled applications, and smart TV app development. The development process includes strategy, UI/UX design, coding, integration, and support. Technologies used include React Native, Flutter, and other frameworks tailored to the project’s goals. The company serves sectors like healthcare, education, and fitness, and maintains a global presence with several offices.

Hoofdzaken:

• Operates in the U.S. with a global team and multiple international offices
• Develops native, cross-platform, and progressive web apps
• Provides legacy app modernization and smart device integration
• Uses technologies such as React Native and Flutter
• Supports industries including healthcare, fitness, and education
  

Services:

• Native mobile app development
• Cross-platform app development
• Progressive web app (PWA) development
• Legacy app modernization
• Bluetooth-enabled app development
• Smart TV app development
• App design and prototyping
• Technical consulting and integration
• Post-deployment maintenance
  

Contactgegevens:

• Website: closeloop.com
• Address:  2672 Bayshore Parkway #532, Mountain View, CA 94043
• Phone: (+1) 650-266-7175
• E-mail: sales@closeloop.com
• LinkedIn: www.linkedin.com/company/closeloop-inc-
• Twitter: x.com/closeloop_tech
• Facebook: www.facebook.com/closelooptechnologies
• Instagram: www.instagram.com/closeloop_tech

*instinctools is a software development company with a U.S. presence, offering mobile application development as part of a broader suite of digital engineering services. The company supports end-to-end product development and works with a variety of industries, including healthcare, fintech, logistics, and education. Mobile development services cover native and cross-platform applications, as well as integration with legacy systems and emerging technologies like AI and IoT. The company provides both standalone app development and extended team models, including IT staff augmentation, dedicated teams, and offshore development centers. Their project approach includes strategy, UX design, development, testing, and long-term maintenance.

Hoofdzaken:

• U.S. office located in Potomac, Maryland with international offices in Germany and Poland
• Offers full-cycle mobile development for native and cross-platform apps
• Supports enterprise automation and integration with AI and cloud platforms
• Works across sectors such as healthcare, fintech, education, and logistics
• Provides team extension models including staff augmentation and offshore centers
  

Services:

• Mobile app development (native and cross-platform)
• Legacy app modernization
• SaaS and cloud-based application development
• AI-powered application engineering
• UX and visual design
• Application testing and QA
• DevOps and infrastructure services
• Product design and innovation consulting
• ERP, CRM, and cloud consulting
• Ongoing app support and maintenance

Contactgegevens:

• Website: www.instinctools.com
• Address: 12430 Park Potomac Ave, Unit 122, Potomac MD 20854, USA
• Phone: +1 202-821-4280
• E-mail: contact@instinctools.com
• LinkedIn: www.linkedin.com/company/instinctools
• Twitter: x.com/instinctools_EE
• Facebook: www.facebook.com/instinctoolslabs
• Instagram: www.instagram.com/instinctools

App Makers LA is a mobile application development company headquartered in Los Angeles, California, with additional offices in New York, San Diego, Boston, and Santa Monica. The company provides mobile development services for both iOS and Android platforms, including native and cross-platform solutions. Their development process includes project consultation, technical planning, UI/UX design, coding, testing, and deployment. App Makers LA works with businesses at various stages, offering flexible engagement models and support for new product development or improvements to existing applications. Services extend to backend development, app maintenance, and performance optimization.

Hoofdzaken:

• Based in Los Angeles with offices in San Diego, New York, Boston, and Santa Monica
• Provides mobile development for iOS, Android, and cross-platform needs
• Supports both early-stage and established businesses
• Covers full development cycle from planning to deployment
• Offers post-launch technical support and app maintenance
  

Services:

• iOS and Android app development
• Cross-platform mobile development
• UI/UX design and prototyping
• Backend development and integration
• App testing and debugging
• Deployment and app store submission
• Technical consulting and planning
• Ongoing maintenance and updates
  

Contactgegevens:

• Website: appmakersla.com
• Address: 1250 S Los Angeles St #223, Los Angeles, CA 90015
• Phone: +1 310 388 6435
• E-mail: team@appmakersla.com
• LinkedIn:www.linkedin.com/company/app-makers-usa
• Facebook: www.facebook.com/appmakersla
• Instagram: www.instagram.com/appmakers.la

Vention is a software development company based in the United States, offering mobile app development services as part of a broader portfolio that includes cloud engineering, AI integration, web development, and dedicated development teams. The company provides mobile solutions for startups and enterprises across various industries, including fintech, healthtech, edtech, and ecommerce. Vention’s mobile development services cover native iOS and Android apps as well as cross-platform solutions. The development process includes discovery, team staffing, project kickoff, scaling, and long-term support. In addition to building mobile applications, Vention provides services in backend architecture, API integration, quality assurance, and cloud infrastructure. The company’s engineers work remotely with clients from its global offices and are engaged on both short-term projects and long-term partnerships.

Hoofdzaken:

• Headquartered in New York, operating with a global development team
• Offers mobile development services for startups and enterprises
• Covers native, cross-platform, and backend system development
• Supports industries such as fintech, healthcare, edtech, and marketing tech
• Provides flexible engagement models, including dedicated teams and project-based work
  

Services:

• Mobile app development (iOS, Android, cross-platform)
• Backend API development and integration
• UI/UX design for mobile interfaces
• QA and testing services
• Cloud services and infrastructure support
• AR/VR and blockchain-enabled mobile solutions
• AI-powered mobile app features
• Dedicated development teams and IT staff augmentation
• Project planning and strategic consulting
  

Contactgegevens:

• Website: ventionteams.com
• Address: 575 Lexington Avenue, 14th Floor, New York, NY 10022
• Phone: +1 (718) 374-5043
• LinkedIn: www.linkedin.com/company/ventionteams
• Twitter: x.com/ventionteams
• Instagram: www.instagram.com/ventionteam

OpenXcell is a mobile app development company with operations in the United States and India. The company delivers end-to-end mobile application services including strategy, design, development, deployment, and post-launch support. OpenXcell works with native technologies for Android and iOS as well as cross-platform frameworks like Flutter and React Native. In addition to core app development, the company offers support for enterprise mobility, UI/UX design, and IoT integrations. Development processes follow structured phases including consultation, design prototyping, coding, testing, deployment, and maintenance. OpenXcell serves various industries such as healthcare, e-commerce, education, and sports with a team distributed across different development facilities.

Hoofdzaken:

• Based in the U.S. with additional offices and development teams in India
• Offers native and cross-platform app development services
• Follows a structured development lifecycle from research to maintenance
• Serves industries including healthcare, logistics, fintech, and media
• Provides support for enterprise mobility, IoT, and SaaS platforms
  

Services:

• iOS and Android mobile app development
• Cross-platform app development
• App design and UX/UI services
• Mobile app strategy and consultation
• Post-launch support and maintenance
• Enterprise mobility solutions
• IoT app development
• SaaS product development
• QA, testing, and performance monitoring
• Deployment and store submission
  

Contactgegevens:

• Website: www.openxcell.com
• Address: 304 S. Jones Blvd #520 Las Vegas, NV 89107
• Phone: +1 888 777 4629
• E-mail: sales@openxcell.com
• LinkedIn: www.linkedin.com/company/openxcell
• Twitter: x.com/openxcell
• Facebook: www.facebook.com/openxcellai

3 Sided Cube is a digital product and mobile app development company with offices in the United States and the United Kingdom. The company focuses on building mobile applications for organizations and initiatives that aim to address environmental, humanitarian, and social challenges. Its work spans across sectors such as disaster relief, healthcare, climate change, education, and conservation. 3 Sided Cube develops native and cross-platform apps and offers services from discovery and UX/UI design to development and ongoing support. In addition to mobile apps, the company also builds digital platforms that incorporate AI, data analytics, and cloud-based infrastructure for public and nonprofit sector clients.

Hoofdzaken:

• U.S. office located in Washington, D.C. with additional offices in the UK
• Builds mobile apps for social impact and nonprofit organizations
• Works across environmental, health, and humanitarian sectors
• Offers end-to-end development from planning to post-launch support
• Integrates technologies such as AI and cloud infrastructure
  

Services:

• Native and cross-platform mobile app development
• UX and UI design
• Discovery and strategy workshops
• AI integration and smart features
• Cloud-based backend development
• App deployment and lifecycle support
• Custom platform and system development
• Technical consulting for nonprofit and public sector tech projects
  

Contactgegevens:

• Website: 3sidedcube.com
• Address: 80 M Street SE, Washington, D.C 20003
• Phone: +44 (0)1202 611 612
• E-mail: holla@3sidedcube.com
• LinkedIn: www.linkedin.com/company/3-sided-cube
• Twitter: x.com/3sidedcube
• Facebook: www.facebook.com/3SIDEDCUBE
• Instagram: www.instagram.com/3sidedcube

Nagarro is a global digital engineering and technology consulting company offering application development services to businesses in the United States and worldwide. The company provides mobile app development as part of a broader service portfolio, which includes product engineering, cloud services, digital transformation, AI integration, and IT consulting. Nagarro supports native and cross-platform mobile development for Android and iOS, tailored to enterprise and industry-specific use cases. The company operates in multiple sectors, including healthcare, retail, automotive, and finance. Nagarro combines software development with agile methodologies, product strategy, UI/UX design, and long-term operational support.

Hoofdzaken:

• Operates globally with teams in 39 countries, including a U.S. presence
• Provides native and cross-platform mobile app development
• Supports enterprise clients across industries such as healthcare, retail, and automotive
• Offers integrated services in AI, cloud, and digital transformation
• Combines consulting, design, and engineering in full-cycle development
  

Services:

• Mobile app development for iOS and Android
• Cross-platform development using frameworks like Flutter and React Native
• Product engineering and custom software development
• UI/UX design and prototyping
• Cloud architecture and infrastructure services
• Agile consulting and team augmentation
• AI and machine learning integration
• Enterprise digital transformation
• DevOps and continuous delivery pipelines
• Post-launch support and managed services
  

Contactgegevens:

• Website: www.nagarro.com
• Address: 1155 Perimeter Center West, Suite 675, Atlanta, GA 30338, USA
• Phone: +1 678 694 1358
• E-mail: info.us@nagarro.com
• LinkedIn: www.linkedin.com/company/nagarro
• Twitter: x.com/nagarro
• Facebook: www.facebook.com/nagarroinc
• Instagram: www.instagram.com/lifeatnagarro

Appello is a software development company with a presence in the United States, Australia, and the United Kingdom, offering mobile app development as part of a broader digital service portfolio. The company delivers custom mobile solutions for iOS, Android, and wearable platforms. Appello also provides design, AI, AR/VR, and backend system integration services. Their development process includes product strategy, UX/UI design, technical planning, coding, and quality assurance. Appello works with clients across multiple industries such as healthcare, finance, logistics, education, and real estate. In addition to core development, the company offers project support and long-term maintenance services.

Hoofdzaken:

• Offices in Sydney, San Francisco, and London
• Provides mobile and wearable app development for iOS and Android
• Covers multiple industries including healthcare, finance, and logistics
• Offers end-to-end services from planning to post-launch support
• Works with AI, AR, VR, and enterprise systems like CRM and ERP
  

Services:

• Native mobile app development (iOS and Android)
• Cross-platform and wearable app development
• UI/UX design and prototyping
• Product strategy and technical planning
• AI, AR, and VR integration
• CRM and ERP system development
• Project management and QA testing
• Technical support and maintenance
• Web application development
  

Contactgegevens:

• Website: appello.com.au
• Phone:  +1 628 280 6518
• E-mail: hello@appello.com.au
• LinkedIn: www.linkedin.com/company/appello-software
• Facebook: www.facebook.com/appellosoftware
• Instagram: www.instagram.com/appello_software

Promatics Technologies is a software development company with offices in the United States, United Kingdom, India, and the UAE, offering mobile app development as part of a broader digital service portfolio. The company delivers custom mobile applications for Android and iOS platforms, along with cross-platform solutions using frameworks like Flutter and React Native. Promatics works across multiple industries, including fintech, travel, healthcare, real estate, and education. Services cover the full app lifecycle, from research and UI/UX design to development, testing, deployment, and post-launch support. The company also works with emerging technologies such as AI, IoT, and blockchain, and provides cloud services through AWS, Azure, and Google Cloud.

Hoofdzaken:

• Operates internationally with a U.S. presence and global delivery centers
• Offers native and cross-platform mobile app development
• Covers industries like healthcare, e-commerce, fintech, and education
• Provides additional services in UI/UX design, cloud, and emerging tech
• Follows structured processes including agile development and quality assurance

Services:

• Native Android and iOS mobile app development
• Cross-platform development with Flutter and React Native
• UI/UX design and prototyping
• Product discovery and MVP development
• Web and backend system integration
• QA testing and performance monitoring
• Deployment and app store submission
• Post-launch maintenance and updates
• Cloud migration and infrastructure management
• Solutions in AI, IoT, blockchain, and wearable tech
  

Contactgegevens:

• Website: www.promaticsindia.com
• Address: 99 Hudson Street, 5th Floor, New York, NY 10013, USA
• Phone: +1-607-821-7766
• E-mail: hi@promaticsindia.com
• LinkedIn: www.linkedin.com/company/promatics-technologies-private-limited
• Twitter: x.com/promatics
• Facebook: www.facebook.com/promatics
• Instagram: www.instagram.com/promaticstechnologies