A Free, Cross‑Platform Postman Alternative That Beats Performance

Why Look for a Postman Replacement?

Postman dominates the REST testing market but suffers from poor performance, mandatory login, and commercial fees, prompting many developers to search for alternatives.

1. Completely Free Functionality

Earlier community versions of Reqable limited the number of API collections and tags, but the latest release removes all such caps. Sending requests and saving collections are fully free, making it a viable Postman substitute.

2. Strong Performance

Reqable is built with Flutter and C++, delivering near‑instant startup, minimal memory footprint, and low storage usage. Compared with Postman, Apifox, Apipost, Bruno and Insomnia—applications that wrap a browser—Reqable’s native implementation is markedly faster.

The performance test used a MacBook Pro 2017 with the latest January 2024 versions of each tool. Startup time was measured by frame‑difference analysis of a screen‑recording, and memory usage was recorded when the app was idle in the background after installation. Flutter’s support for 120 Hz (or higher) refresh rates gives Reqable a smooth interaction advantage.

3. Clean and Attractive UI

The interface is minimalist, without unnecessary elements. Users focusing only on API testing can select the API测试 mode or switch to 禅模式 for an even cleaner view. Reqable also offers light and dark themes, 15 code‑highlight schemes, and 16 accent color palettes (customizable in the paid tier).

4. Data Migration

Reqable can import data from other REST tools, currently supporting Postman, Hoppscotch, ApiPost, ApiFox, cURL and HAR files. Upcoming releases will add OpenAPI and Insomnia import capabilities.

5. HTTP/2 & HTTP/3 Support

Unlike most REST clients, Reqable natively tests HTTP/2 and HTTP/3 (QUIC) protocols, which many servers now require.

6. Packet Capture Debugging

Beyond standard API testing features such as environment variables, Python scripts, and code generation, Reqable’s core advantage is its packet‑capture debugging. It can analyze traffic from browsers or applications, create APIs directly from captured packets, map live requests to a local server, and compare request differences to pinpoint issues quickly.

7. Active Community

Although both Reqable and Postman are closed‑source commercial products, Reqable has cultivated an active GitHub community. In under two years, contributors have filed over 1,000 issues, with an 80 % resolution rate, compared to Postman’s 13,000+ issues.

8. Open‑Source Contributions

Built on the open‑source Flutter framework, Reqable contributes back by open‑sourcing the re‑editor code editor and the re‑highlight syntax‑highlight library, which are used by many other projects.

Overall, Reqable provides a free, high‑performance, cross‑platform alternative to Postman, addressing its major pain points while maintaining a vibrant community and contributing to open‑source tooling.