As of September 2026, Latka tracks 9 API design tools companies with $10M–$100M in annual revenue. They have combined revenues of $219.6M and employ 1.1K people. They have raised $431.8M and serve 3.5K customers combined.
Every company below sells API design tools to other businesses and is ranked by its most recent annual revenue. Revenue, funding, headcount and customer figures come from CEO interviews on the Latka podcast, public company filings, and Latka estimates where a company has not disclosed a number.
API Design Tools are software solutions that assist developers in creating, modifying, and managing application programming interfaces (APIs). These tools streamline the process of designing APIs by providing functionalities such as visual interface design, documentation generation, testing, and validation. Primary use cases include developing RESTful and SOAP APIs, as well as ensuring that APIs are user-friendly, secure, and well-documented to facilitate integration with other software applications. Common features of API Design Tools include template-based design, version control, simulation of API requests and responses, and analytics for monitoring API performance. Buyer personas typically include software developers, API product managers, and technical architects who seek to organize development workflows more efficiently and ensure that APIs cater effectively to the needs of both the developers and the end-users. By utilizing these tools, organizations can enhance collaboration among teams and improve the overall quality of their API offerings.
Sorting: Highest -> Lowest
Showing 9 of 9 companies ranked by annual revenue.
San Francisco, California, United States
Nylas provides an API platform that enables developers to quickly and securely access and process user data from any email and calendar.
Boston, Massachusetts, United States
Herald builds digital infrastructure that connects software developers to commercial insurance carriers through a single API, enabling quoting, binding, and issuance of commercial insurance.
Houston, Texas, United States
We are among the leading review scraping service and scraper API providers in the global marketplace, and we deliver customized review scraping APIs to our clients ranging from startups to enterprise level. We harness the latest technologies and tools for review data mining and assisting enterprises in getting large-scale, well-structured data from the web.
Aldgate, England, United States
Developer of an open banking platform intended to offer a crypto-payment network and API ecosystem designed for the digital era. The company's platform offers an alternative to today's traditional and digital payment systems by offering a flexible digital transaction management environment to establish PSD2 compliance, generate new revenues and valuable customer profiling data, heighten digital payment security and eliminate fintech disintermediation, enabling banks to quickly and cost effectively comply with the directive before the deadline and monetise their investment in PSD2.
San Francisco, California, United States
Agave provides a unified API for data access across various construction software platforms. It operates as a Provider of API for integration of construction software.
Denver, Colorado, United States
Gravitee.io is an end-to-end solution for both synchronous and asynchronous API lifecycle management, built on an event-native API Gateway with support for REST, SOAP, Websockets, Webhooks, Kafka, MQTT, and more. Because of its breadth of capabilities and unique support for streaming data, Gravitee enables developers and business users all around the world to build, manage, and secure all their APIs in one place.
Latka tracks 9 API design tools companies with $10M–$100M in annual revenue. Together they generate $219.6M in annual revenue and employ 1.1K people.
Nylas is the largest, with $75M in annual revenue, founded in 2013.
The average API design tools company in this list makes $24.4M a year, across 9 companies with reported revenue. They serve 3.5K customers combined.
Ranked by annual revenue, the leaders are Nylas, heraldapi.com, TrueLayer, ReviewGators and token.
The 9 API design tools companies with $10M–$100M in annual revenue tracked here have raised $431.8M in disclosed funding between them.
- The product must facilitate the design and documentation of APIs. - It should support multiple API protocols and formats (e.g., REST, SOAP). - The tool must include testing capabilities to ensure API functionality and performance. - It should provide features for collaborative design among development teams. - The product must offer a visual interface for defining API endpoints and data models. - Not just a code generation tool; must also facilitate design and testing workflows.
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