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 10 API Design Tools Companies (November 2026)
As of November 2026, Latka tracks 74 API design tools companies. They have combined revenues of $471.3M and employ 4.4K people. They have raised $442.4M and serve 735.2K 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
- 74
- Revenue
- $471.3M
- Funding
- $442.4M
- Employees
- 4.4K
Filters
Sorting: Highest -> Lowest
Top API Design Tools Companies by revenue
Showing 10 of 74 companies ranked by annual revenue.
2
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
4
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
6
Aqueduct, Inc.
United States
ApiOverflow uses cutting edge generative AI technology to learn how to use APIs and convert your questions into usable code.
- Revenue
- $8.5M
7
Ozone API
London, England, United Kingdom
Ozone API is the leading standards based platform that handles the complexity of open banking, making it easy for any financial institution to meet both regulatory and commercial requirements for an open API. Banks using the Ozone API can accelerate their implementation of open APIs, and bring new commercial services to market ahead of the competition.
- Revenue
- $7.2M
- Year founded
- 2017
- Team size
- 65
8
Datafiniti
Austin, Texas, United States
There are billions of web sites on the Internet. Those web sites contain trillions of points of information. All of that information is potential data. Data on businesses, products, homes, people, and much more. All of that data can be used for a wide variety of business applications like lead generation, pricing intelligence, competitive analysis, and much more. The problem is that web data is very hard to access for businesses. Businesses must go through a complicated and expensive process of acquiring, cleaning, bundling, and distributing web data before they can consume it. Datafiniti simplifies all of these steps into a single step of accessing our API. Datafiniti's promise is to take the entire Internet, and using our proprietary technology, transform it into a single database that all businesses can use to access the web data they need. In other words, Datafiniti is instant access to web data.
- Revenue
- $5.6M
- Year founded
- 2011
- Team size
- 8
9
Marvin AI
Oakland, California, United States
Marvin is a lightweight toolkit that enables developers to build reliable, scalable, and trustworthy natural language interfaces. It provides AI functions and bots to easily integrate AI capabilities into existing codebases without requiring extensive AI knowledge.
- Revenue
- $5.4M
- Team size
- 49
10
Buf
Toronto, Ontario, Canada
The Protobuf developer platform Accelerate API development with Buf, the only end-to-end developer platform for Protocol Buffers, gRPC, and Kafka.
- Revenue
- $5.4M
- Team size
- 49
Frequently asked questions about API Design Tools Companies
How many API design tools companies are there?
Latka tracks 74 API design tools companies with reported revenue. Together they generate $471.3M in annual revenue and employ 4.4K 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 $6.4M a year, across 74 companies with reported revenue. They serve 735.2K customers combined.
Who are the leading API Design tools vendors?
Ranked by annual revenue, the leaders are Postman, useagave.com, Oneloop, Gravitee and ReadMe.
How much funding have API design tools companies raised?
The 74 API design tools companies tracked here have raised $442.4M 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.