Top 45 API Design Tools Companies Under $1M Revenue (September 2026)

San Francisco, California, United States

Tabby is an open-source, self-hosted AI coding assistant that provides developers with a powerful alternative to GitHub Copilot. It allows teams to set up their own language model-powered code completion server without relying on external databases or cloud services. Tabby is designed for ease of integration with existing development environments through an OpenAPI interface and supports consumer-grade GPUs for enhanced performance. Its features include intelligent code suggestions, auto-completion, and natural language interactions, significantly boosting productivity for software development teams.

San Francisco, California, United States

The AI Software Architect

Palo Alto, California, United States

GraphQL solutions for Platform teams. Inigo is a GraphQL booster — A GraphQL lifecycle management for any GraphQL implementation.

Surry Hills, New South Wales, Australia

vSure is Work Rights Made Easy! Offering Australian employers seamless compliance and optimised Employee Experience by: - Streamlining the initial work rights check for ALL staff; and - Automating the monitoring of temporary visas; vSure also offers software developers a modern, RESTful API for checking visas. And CRICOS instituations a means of bulk checking Study Visas to manage CoEs, track enrollments and optimise capacity.

United States

KrakenD, established in 2016, has reshaped the API Gateway market with its groundbreaking stateless, engineer-oriented solutions. Our Layer 7 API Gateway software enables companies to transition from legacy systems to modern, micro-services-oriented architectures effortlessly. Through a potent mix of simplicity, performance, and scalability, we have earned top rankings on G2, including Easiest Admin, Fastest Implementation, and Best Meets Requirements in API Management. Our commitment to open source is reflected in the donation of our core framework to the Linux Foundation, ensuring its sustainability beyond our operations. Currently, over 2 million servers worldwide run on KrakenD each month, a testament to our influence in the industry. By engineering for performance and pricing for growth, we've become the preferred API Gateway solution that not only tech teams appreciate but also financial officers endorse. To learn more about how KrakenD can propel your company's growth, visit our website today.

United States

Rollout is the only product where you connect your API once and then drop-in UI components to embed every integration within your app

Seoul, South Korea

Developer of a software designed to build and deploy machine learning models. The company's software easily integrates machine learning models in minutes with API and offers intuitive data cleansing and analysis, enabling developers and data scientists to use machine learning technology without requiring an in-depth knowledge.

Los Angeles, California, United States

Markup Hero is a bootstrapped screenshot and image annotation software company founded in 2020 by Jeff Solomon and two co-founders. The product is sold direct to consumers and business users at $4 per month, with a separate API offering in beta that charges on a per-markup basis for third-party SaaS integrations. As of early 2022, the company had approximately 10,000 paying customers and was generating roughly $20,000 in monthly revenue. Operating costs excluding founder compensation run approximately $3,000 per month, with the remaining cash distributed among the three founders. The company has raised no outside capital. Solomon, a six-time founder with three prior exits, brings a deliberate lifestyle-business philosophy to Markup Hero. His primary growth lever is organic SEO and a structured content-marketing operation that blends his own writing with third-party contributors, generating consistent inbound backlink partnerships and domain authority gains.

Reading, England, United Kingdom

Integral Zone, a MuleSoft & Salesforce partner, is at the forefront of API integration and product innovation. Over the last 10 years, we have empowered hundreds of clients with Digital transformation. We've channeled our insights from these engagements into groundbreaking tools to enhance development lifecycles. Our offerings have enabled our customers to significantly reduce development costs. 🌟 Our Key Products: 🦅 Falcon Eye: Delve into efficient code scanning for seamless operation of live MuleSoft projects. 🛡️ Falcon Pulse: Vigilantly oversees API connections, ensuring uninterrupted functionality through real-time API health monitoring. 🔍 Falcon Scan: An integrated SAST tool within MuleSoft Anypoint Studio, boasting comprehensive code scans using over 180+ predefined rules and customizable options. ⚡ Falcon Accelerators: A design tool that facilitates the creation of MuleSoft project templates, patterns, and automated AI-driven code generation. 🔗 Dig Deeper: More details: https://falcon.integralzone.com 🌍 Free trial: https://integralzone.com/analyzer/ 🎁 Book an online demo: https://integralzone.com/book-online-demo/ 🖥️

Milan, Lombardia, Italy

Fintech API for the Sharing Economy | Collect money from friend and family for anything you wish | API and Saas Available for third parties