Dev tools · alternatives · 2026

24 alternatives to RequestBite Slingshot

Not your average API client - FOSS, fast and local-first.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Apidog Fast Request▲512

   Develop APIs fast + automatically detect endpoints

   2025 · its alternatives →

2. 2
   API_TESTER▲249

   Test your APIs right from the macOS menu bar

   2025 · apps.apple.com · its alternatives →

3. 3
   Postman for Mac (Beta)▲368

   Build, test, and document your APIs faster

   2016 · its alternatives →

4. 4IR
   Intercept.rest – Faster API debugging▲89

   Sharing an internal tool that accelerated my development work 10-fold, especially with API debugging. Thought fellow developers here might find it useful. As a developer, I often have trouble reproducing errors at the client end. https://intercept.rest lets me debug and monitor API requests and responses. It is similar to the Network tab in Chrome Developer Tools but works for any API: mobile apps, webhooks, frontend etc. After I shared it with a close circle of friends, they found it incredibly useful and even found new use cases, I never imagined. Been a long time lurker here and…

   2018 · its alternatives →

5. 5HR
   Hurl – Run and test HTTP requests with plain text, curl and Rust▲223

   2021 · hurl.dev · its alternatives →

6. 6
   Postman▲182

   Postman is a powerful HTTP client to test REST API

   2014 · its alternatives →

7. 7
   Deposure▲185

   Launch your APIs live effortlessly

   2025 · its alternatives →

8. 8
   ApiHome▲73

   Home of API testing

   2022 · its alternatives →

9. 9NW
   New way to test APIs with OpenAPI and Postman▲80

   2021 · github.com · its alternatives →

10. 10
    Decoy▲99

    Local server mocks in macOS, all in a lightweight native app

    Mar 2026 · decoy-app.com · its alternatives →

11. 11
    WebSlurp▲9

    The Fastest Way to Test API Security Inside Chrome DevTools

    Jul 2026 · webslurp.github.io · its alternatives →

12. 12
    Prism▲79

    Accelerate API development with realistic mock servers

    2023 · its alternatives →

13. 13
    Mocklets▲82

    A HTTP-based API simulator to assist parallel development 🛠️

    2018 · its alternatives →

14. 14AF
    A Fast HTTP Request CLI Powered by HTTL▲53

    2025 · httl.dev · its alternatives →

15. 15
    Postcat▲16

    A powerful open source, cross-platform API development tool.

    2024 · its alternatives →

16. 16AA
    Apicat – A Lightweight Offline Postman Alternative▲13

    Apicat is the ultimate offline Postman alternative that stores your .http files locally. It’s Git-friendly, open-source, and highly compatible with Postman. Test APIs offline with this powerful free offline API client designed for developers who need a reliable local API testing tool.

    Oct 2025 · apicat.com · its alternatives →

17. 17
    apicoffee.com▲8

    All-in-one API tool, mobile-first, no data to third-party

    2025 · its alternatives →

18. 18
    Mock Studio▲3

    A simple yet powerful AI Powered HTTP API mocking tool

    Feb 2026 · mockstudio.app · its alternatives →

19. 19
    BrowserGrab API▲6

    Screenshot any website in 50ms. One API call. Easy Setup.

    Oct 2025 · browsergrab.app · its alternatives →

20. 20OS
    Open-Source HTTP Interceptor – Capture, Modify, Run Requests in Browser▲5

    Hey HN, I recently built an open-source HTTP interceptor called Relay, which works as a Chrome extension for capturing, modifying, and replaying HTTP requests directly in your browser — no account needed. How it works: Relay lets you capture requests as they happen, modify parameters, headers, or body content, and replay them on the fly. You can customize or debug network requests quickly without needing an external tool or complex setup. Key features: - Simple setup: Install the extension and start a session to capture requests. You can filter by URLs and methods. -Request modification:…

    2024 · chromewebstore.google.com · its alternatives →

21. 21
    API Explorer▲7

    Test, document, and optimize apis effortlessly

    2025 · its alternatives →

22. 22
    API Tester Pro▲3

    Test REST APIs quickly, right in your browser

    2025 · chromewebstore.google.com · its alternatives →

23. 23
    ProxyHub▲10

    Tunnel, inspect & mock localhost - no backend needed

    Apr 2026 · proxyhub.app · its alternatives →

24. 24
    apimock-rs▲9

    A developer-friendly, fast and functional HTTP(S) server.

    Nov 2025 · apimokka.github.io · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →