⚡ API Build Tools

API build tools are solutions used to design, document, test, and maintain application programming interfaces throughout the development lifecycle.

They typically provide API specification formats, interactive documentation, request testing and automation, validation, and collaboration features.

⭐ Most Popular in 2026

The following chart shows the leading API build tools on the web in 2026, based on market share.

The most popular is Swagger with a share of 23.3%, followed by Postman with 0.8%.

Swagger 23.3%
Postman 0.8%

🚀 Country Highlights

Here is a list of tools that are especially popular in certain countries.
Differences between global and country rankings are shown in parentheses.

Swagger is #1 in the United Kingdom ^(-1)

✨ Best API Build Tools

Below is a more detailed list of 2 API build tools we detect, ranked by their market share.

Available filters: API No-Code

Rank	Name	Market share
1	Swagger Somerville, Massachusetts, United States A set of open-source tools built around the OpenAPI Specification that can help you design, build, document, and consume REST APIs. FreeOpen source$19+/month	23.3%
2	Postman San Francisco, California, United States A cloud-based collaboration platform for API development that allows users to build, test, design, modify, and document APIs. Free$19+/user/month	0.8%

Data is based on the analysis of 3,320,618 websites.
Statistics were last calculated on March 21, 2026.
For details, see our methodology and disclaimer.