Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

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Realware LLC
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Realware's Mission is to provide high-quality IT solutions and services to small and mid-sized businesses. Established in 1999, we function as a Managed Service Provider (MSP), Managed Application Service Provider (MASP), and Managed Security Service Provider (MSSP). We collaborate with our clients
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Longmont, Colorado, Us
Services Provided+10 Services
8% Custom Web Application Development
4% API Development & Integration
1% E-Commerce Development
5% Backend Development
AI Summary
“Realware LLC provides comprehensive managed IT, application, and security services to small and mid-sized businesses, enhancing infrastructure, reducing costs, and supporting core operations effectively.”
KMsoft
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KMSoft Company, located in Surat, Gujarat (India), was founded in 2013 as an IT firm. We focus on providing top-notch digital solutions, such as web, mobile, and tablet applications, customized to fulfill specific business requirements. With an emphasis on innovation and performance, KMSoft delivers
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided+5 Services
10% Custom Web Application Development
5% QA & Software Testing
3% E-Commerce Development
8% Mobile App Development (iOS & Android)
AI Summary
“KMSoft, founded in 2013 in Surat, India, offers innovative web, mobile, and tablet app development, technical support, and reliable digital solutions to drive business growth.”
Webonology Inc.
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Webonology is a Toronto-based digital product agency that has received multiple awards. They specialize in creating custom web applications, mobile platforms, SaaS solutions, AI integration, and system integration to meet the complex needs of businesses. Since 2016, they have completed over 100 proj
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Toronto, Ontario, Ca
Services Provided+8 Services
8% Custom Web Application Development
5% Mobile App Development (iOS & Android)
5% SaaS Product Development
2% API Development & Integration
AI Summary
“Webonology Inc. is a Toronto-based award-winning digital agency specializing in custom web and mobile applications, SaaS, AI integration, branding, and system integration for diverse industries.”
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AFKMAC LLC
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iDev.ma is an agency focused on software engineering and technological innovation, dedicated to creating tailored digital solutions. We guide businesses through their digital transformation by combining advanced technical skills from senior developers with more than a decade of experience, along wit
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Rabat, Ma
Services Provided+10 Services
8% Custom Web Application Development
3% QA & Software Testing
2% Legacy System Modernization
2% E-Commerce Development
AI Summary
“AFKMAC LLC, through iDev.ma, offers expert software engineering and technological innovation services, leveraging AI and data analytics to deliver tailored digital solutions and drive business growth.”
bizWorkz Consulting
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We are a company that specializes in integrated marketing, technology, and digital services. By combining creativity with technology, we assist brands, companies, and organizations in thriving during a time of digital transformation. Our comprehensive Integrated Marketing Services and Technology sol
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided+19 Services
6% Custom Web Application Development
3% E-Commerce Development
5% Mobile App Development (iOS & Android)
3% API Development & Integration
AI Summary
“bizWorkz Consulting delivers integrated marketing, technology, and digital services, enabling diverse clients—from startups to multinationals and the Indian Navy—to navigate digital transformation and growth effectively.”
Digital Code
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We focus on assisting IT startups in realizing their projects. From research and planning to the delivery of the final product, we provide comprehensive project management services to guarantee your project's success. Our team of experts possesses the skills and experience to support you throughout
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Mobile App Development (iOS & Android)
25% Custom Web Application Development
5% API Development & Integration
15% Search Engine Optimization (SEO)
AI Summary
“Digital Code offers comprehensive project management and expert support for IT startups, guiding them from concept development through research, planning, and final product delivery to ensure successful project completion.”
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BYBOWU
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BYBOWU is a web and mobile app development agency located in Phoenix that assists businesses throughout the United States in creating, launching, and expanding digital products. Established by developers who witnessed numerous companies suffer due to unreliable vendors, BYBOWU operates on a straight
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Phoenix, Arizona, Us
Services Provided+4 Services
10% Custom Web Application Development
9% Mobile App Development (iOS & Android)
3% API Development & Integration
4% E-Commerce Development
AI Summary
“BYBOWU is a Phoenix-based agency specializing in custom web and mobile app development, e-commerce, AI solutions, and digital marketing, delivering efficient, in-house digital product services nationwide.”
SyncWeb
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At SyncWeb, we focus on enhancing your online presence through a wide range of IT services. Our skills cover Web Design and Development, Graphic Design, E-commerce Solutions, Social Media Management, Customer Support, Virtual Assistance, and Web Security. We are committed to providing creative solut
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+10 Services
10% Custom Web Application Development
4% Mobile App Development (iOS & Android)
6% API Development & Integration
5% UX Research & Usability Testing
AI Summary
“SyncWeb offers comprehensive IT services including web and graphic design, e-commerce solutions, social media management, and web security to enhance businesses' digital presence effectively.”
Web7
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At Web7, we go beyond being a typical digital agency. We consist of a passionate group of developers, designers, and strategists focused on revolutionizing businesses with innovative digital solutions.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+13 Services
15% Custom Web Application Development
10% Machine Learning Model Development
5% AI Strategy & Roadmap Consulting
5% API Development & Integration
AI Summary
“Web7 is a digital agency comprising developers, designers, and strategists dedicated to delivering innovative digital solutions that transform and advance businesses across diverse industries.”
Appler
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We are a team of tech-savvy enthusiasts running a self-funded organization that focuses on consulting opportunities in distributed networks, custom development for web and mobile, cloud and DevOps services, as well as data and AI/ML sectors. We take pride in the quality of our work, and the continue
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+11 Services
3% Generative AI
4% LLM Integration & Prompt Engineering
3% Workflow Automation (Zapier / Make / n8n)
4% Machine Learning Model Development
AI Summary
“Appler is a self-funded tech consulting firm specializing in distributed networks, custom web and mobile development, cloud and DevOps services, as well as data and AI/ML solutions with a strong focus on quality and client collaboration.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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