Leading API Development Companies in United States

Searching for the right API Development company in the United States? When APIs link your products, partners, and data, they become mission-critical to reliability, security, and growth. With so many vendors, how do you spot the best fit for your stack, timeline, and budget? You need data-driven research, not guesswork.

ITProfiles connects you with the right United States-based API Development agency using the ITP Score, our data scan across the web that finds 113 companies, delivering an unbiased list, neutral expert analysis, and pros and cons for every provider we cover. Ready to choose with confidence?



Recent white-glove matches:

A US nonprofit organization connected with 2 agencies for a donor management platform
A UK fintech startup connected with 4 agencies to build a secure customer onboarding platform
A Swedish startup matched with 2 agencies that required a HIPAA-compliant tool for their app
A German manufacturing company connected with 2 agencies for an AI-powered predictive maintenance solution
A Denver-based SMB connected with 3 agencies for their automation project
A Canadian logistics company connected with 3 agencies for a custom fleet management platform
A Netherlands-based startup matched with 3 agencies to develop an AI-powered document processing application
A UAE real estate firm matched with 2 agencies to develop a property management and CRM system
An Australian eCommerce brand matched with 5 agencies to migrate their store to Shopify Plus
A California healthcare provider matched with 3 agencies for a patient portal modernization project

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Expert-Recommended API Development Companies in United States

162 Companies Showing 151 - 162 Updated on October 27, 2026 Editor:
    Elena Paraschiv-Pop
Every agency on ITProfiles is evaluated for expertise and client feedback to help you make informed decisions. See how we rank companies
  • Catapult.io

    Catapult.io

    Charleston, United States
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    Catapult.io, based in Charleston, SC, is an innovative tech company dedicated to propelling businesses to new heights. With a passion for cutting-edge solutions, we pride ourselves on delivering top-notch services tailored to meet the unique needs of our clients.At Catapult.
    API Development, Mobile App Development, DevOps, Cloud Computing
    • 2-10 Members
  • Bitwise Digital

    Bitwise Digital

    Houston, United States
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    Bitwise Digital is a leading tech company based in Houston, TX, dedicated to empowering businesses through innovative digital solutions. At Bitwise Digital, we believe in the transformative power of technology to drive growth and success for our clients.
    API Development, Mobile App Development, Software Development, eCommerce Development
    • 2-10 Members
  • Orientier

    Orientier

    Lynn, United States
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    Located in Lynn, MA, Orientier is a dynamic company that offers a wide range of cutting-edge services to help businesses thrive in the digital landscape.
    API Development, SEO, Mobile App Development, Digital Strategy
    • Freelancer
  • AuroPro Soft Systems

    AuroPro Soft Systems

    Plainsboro Township, United States
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    AuroPro Soft Systems, located in Plainsboro Township, NJ, is a cutting-edge technology company specializing in a wide range of services to meet the diverse needs of businesses in today's digital landscape.
    API Development, Mobile App Development, Software Development, Cloud Computing
    • 201-500 Members
  • Versent

    Versent

    Denver, United States
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    Versent, located in Denver, CO, is a leading technology company specializing in a wide range of services to help businesses thrive in the digital era.
    API Development, Software Development, Cloud Computing, IoT Services
    • 201-500 Members
  • Oasis Intelligence LLC

    Oasis Intelligence LLC

    Orlando, United States
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    Oasis Intelligence LLC is a cutting-edge technology company based in Orlando, FL, dedicated to providing a wide range of development and software solutions to meet the diverse needs of businesses.
    API Development, Web Development, Mobile App Development, Software Development
    • 2-10 Members
  • aPurple

    aPurple

    Lakeville, United States
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    Transforming Startup Ideas into Scalable Success

    aPurple is a premier startup app development company, offering mobile app, SaaS, MVP, software, and web development services that transform innovative startup ideas into market-ready solutions that drive success.
    API Development, Mobile App Development, Software Development, Web Development
    • Founded in 2017
    • 201-500 Members
    • $10 - $24/hr
    • $5,000 to $10,000
  • Netlink Resource Group

    Netlink Resource Group

    United States
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    Custom Software Solutions, API Integration Services, CRM Solutions

      Netlink Resource Group specializes in custom web application development for organizations with complex operational and integration requirements.
    API Development, Mobile App Development, Web Development, Software Development
    • Founded in 1996
    • 11-20 Members
    • $50 - $99/hr
    • $5,000 to $10,000

    Industries Specialization

    Travel 10%

    Startup 10%

    Hospitality & Leisure 10%

    Healthcare 10%

    Enterprise 10%

  • Dev Technosys

    Dev Technosys

    Commerce, United States
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    devtechnosys

    Dev Technosys has been delivering bespoke mobile app development services and web development services to clients all across the world.
    API Development, Mobile App Development, Software Development, Artificial Intelligence
    • Founded in 2010
    • 101-200 Members
    • $100 - $149/hr
    • $5,000 to $10,000
  • Velanapps

    Velanapps

    United States
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    Custom Software. Real Business Impact.

    VelanApps is a trusted outsourcing partner for innovative software development, helping businesses across the globe build scalable and high-performing digital products.
    API Development, Web Development, Mobile App Development, Software Development
    • Founded in 2007
    • 201-500 Members
    • $10 - $24/hr
    • $5,000 to $10,000

    Industries Specialization

    Enterprise 50%

    B2B 50%

  • Gaurish Technologies LLC

    Gaurish Technologies LLC

    Dover, United States
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    An IT Resource for Everyone

    Gaurish Technologies LLC is a professional IT solutions and software development company with operations in the USA, serving businesses worldwide.
    API Development, Artificial Intelligence, Mobile App Development, Web Development
    • Founded in 2010
    • 21-50 Members
    • $25 - $49/hr
    • $75,000 to $100,000

    Industries Specialization

    Retail 10%

    Real Estate 10%

    Medical 10%

    Hospitality & Leisure 10%

    ERP 10%

  • Netlink Resource Group

    Netlink Resource Group

    Alexandria, United States
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    Custom Technology Solutions for Complex Business Needs Netlink Resource Group helps US businesses and organizations solve complex software, technology, and marketing system challenges.
    API Development, Software Development, Web Development
    • Founded in 1994
    • 11-20 Members
    • $100 - $149/hr
    • $5,000 to $10,000

    Industries Specialization

    Transportation 10%

    Medical 13%

    Hospitality & Leisure 16%

    Healthcare 16%

    Enterprise 19%

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