1
Postman
San Francisco, California, United States
a collaboration platform for API development, allowing users to design, develop, and test APIs more efficiently.
- Revenue
- $313.1M
- Customers
- 500K
- Year founded
- 2014
- Funding
- $433M
- Team size
- 3.3K
Top 50 API Design Tools Companies (August 2026)
As of August 2026, Latka tracks 88 API design tools companies. They have combined revenues of $655.2M and employ 5.4K people. They have raised $924.4M and serve 738.8K 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.
What API Design Tools Companies do
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.
- Companies
- 88
- Revenue
- $655.2M
- Funding
- $924.4M
- Employees
- 5.4K
Filters
Sorting: Highest -> Lowest
Top API Design Tools Companies by revenue
Showing 10 of 88 companies ranked by annual revenue.
2
Nylas
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.
- Revenue
- $75M
- Customers
- 450
- Year founded
- 2013
- Funding
- $145M
- Team size
- 142
3
heraldapi.com
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.
- Revenue
- $26.2M
- Year founded
- 2021
- Team size
- 103
- Revenue
- $24.9M
- Year founded
- 2016
- Funding
- $236.8M
- Team size
- 281
5
ReviewGators
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.
- Revenue
- $22M
- Year founded
- 2012
- Team size
- 200
6
token
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.
- Revenue
- $17.2M
- Customers
- 3K
- Year founded
- 2015
- Funding
- $50M
- Team size
- 106
7
useagave.com
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.
- Revenue
- $15.6M
- Year founded
- 2021
- Team size
- 63
- Revenue
- $14.8M
- Year founded
- 2022
- Team size
- 4
9
Gravitee
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.
- Revenue
- $13.2M
- Year founded
- 2016
- Team size
- 120
- Revenue
- $10.7M
- Year founded
- 2015
- Team size
- 71
Frequently asked questions about API Design Tools Companies
How many API design tools companies are there?
Latka tracks 88 API design tools companies with reported revenue. Together they generate $655.2M in annual revenue and employ 5.4K people.
Which API design tools company is the largest?
Postman is the largest, with $313.1M in annual revenue, founded in 2014.
How much revenue does a typical API design tools company make?
The average API design tools company in this list makes $7.4M a year, across 88 companies with reported revenue. They serve 738.8K customers combined.
Who are the leading API Design tools vendors?
Ranked by annual revenue, the leaders are Postman, Nylas, heraldapi.com, TrueLayer and ReviewGators.
How much funding have API design tools companies raised?
The 88 API design tools companies tracked here have raised $924.4M in disclosed funding between them.
Related Development Software categories
Inclusion Criteria
- 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.