Best Open Source API Clients using Rollup in 2026

Hoppscotch

Sleek, intuitive API development and testing platform

Stars
79,741
Forks
5,951
Last commit
4 days ago

Lightweight, fast, and feature-rich API client for developers. Test, debug, and document APIs with ease in a clean, modern interface.

Open Source Alternative to:

Postman

Bruno

Lightweight, fast, and open-source API client for developers

Stars
45,375
Forks
2,641
Last commit
2 days ago

A modern, user-friendly API client that simplifies API testing and development with a clean interface and powerful features.

Open Source Alternative to:

Postman

Requestly

Intercept, modify, and debug HTTP(S) requests effortlessly

Stars
6,719
Forks
701
Last commit
7 hours ago

A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Open Source Alternative to:

Postman

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Hoppscotch

Sleek, intuitive API development and testing platform

Stars
79,741
Forks
5,951
Last commit
4 days ago

Lightweight, fast, and feature-rich API client for developers. Test, debug, and document APIs with ease in a clean, modern interface.

Open Source Alternative to:

Postman

Bruno

Lightweight, fast, and open-source API client for developers

Stars
45,375
Forks
2,641
Last commit
2 days ago

A modern, user-friendly API client that simplifies API testing and development with a clean interface and powerful features.

Open Source Alternative to:

Postman

Requestly

Intercept, modify, and debug HTTP(S) requests effortlessly

Stars
6,719
Forks
701
Last commit
7 hours ago

A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Open Source Alternative to:

Postman

Open Source API Clients using Rollup

A curated collection of the best open source client applications for interacting with and testing APIs. using Rollup.

Hoppscotch

Bruno

Requestly

Hoppscotch

Bruno

Requestly