Alternatives

Products that do what Thunder Client does

Rest API client for VS Code, lightweight Postman alternative

1. 1
   Postcode▲105

   VSCode extension alternative to Postman

   2021

2. 2
   Fetch Client▲78

   REST client extension for VS code, alternative to Postman

   2022

3. 3
   Thunderbird 115 Supernova▲175

   Make email easier

   2023

4. 4
   Postman▲182

   Postman is a powerful HTTP client to test REST API

   2014

5. 5
   Layer Client API▲239

   Messaging, built for developers - now for web and desktop

   2015

6. 6
   NotHotDog (Alpha)▲239

   Test your LLM powered APIs & AI agents

   2024

7. 7
   Xplorer▲103

   A Secure, 100% Local API Client

   Nov 2025

8. 8
   Telegram X▲257

   An alternative Telegram client built in Swift

   2017

9. 9CB
   Console based email client with Lua scripting▲78

   2017 · lumail.org

10. 10
    ozma.io▲117

    Low-code platform for CRM and ERP solutions

    2022

11. 11
    Hanabi.rest▲98

    Prompt to Backend API by AI with Playground

    2024

12. 12
    StaticBackend▲118

    Low code self-hosted backend API to build web apps

    2023

13. 13
    NativeRest▲136

    Native REST API client for Windows

    2023

14. 14
    GraphQL Zeus▲101

    GraphQL client/code generator with autocomplete library ⚡

    2020

15. 15
    Blockman▲113

    Highlight nested code blocks

    2021

16. 16
    TextBin▲104

    A privacy focused open source alternative to paste bin

    2024

17. 17SJ
    Single JavaScript API Client for sheet2api.com▲54

    2020 · github.com

18. 18IV
    I've built a REST Test client in my spare time▲11

    Hi HN,<p>In my spare time (evenings and weekends) I've built 3 products which have been relatively successful even with little advertising (only google ads budgeted at $30 per day). The latest one is WcfStorm.Rest; which is a REST service test client. I built it because I found that the current tools did not have the features I wanted such as, intellisense when working with HTTP headers, syntax highlighting for JSON messages, etc.<p>I'm continually trying to improve these products and would very much love get your feedback. Every suggestion is welcome!<p>(My apologies…

    2012 · wcfstorm.com

19. 19CM
    C++ Modern Web Api Client Built with Oat++▲6

    2018 · github.com

20. 20SP
    Single Python API Client for Google Sheets and MS Excel APIs▲26

    2020 · github.com

21. 21EO
    EmailEngine, open source REST interface to read and send email messages▲16

    2021 · github.com

22. 22BA
    Building a Cloud Native Kubernetes Java Client▲6

    Started this because configuring Fabric8 for EKS was driving me crazy. Building a client that auto-detects your environment (IAM roles, profiles, local configs) so you don't have to wire it all up manually. Still pretty early and building for EKS right now. Long way to go, but putting it out there early to see if others have hit the same problems or want to help shape where this goes.

    Oct 2025 · github.com

23. 23BO
    Bruno – open-source API Client (alternative to postman))▲7

    2022 · usebruno.com

24. 24RT
    Rx, the Deploy-as-you-save client for the cloud▲8

    rx is a lightweight CLI and runtime that lets you deploy any function instantly as you save it in your editor. It’s fast, simple, and takes care of setting up all your cloud infrastructure. The best dev experience with everything you need built-in: - auth - permissions - payments - secrets - storage - logs - email & SMS - and way more Related beta launch tweet: https://x.com/KhalidZoabi/status/1777673531972608249 Wanted to show it to you guys, gauge interest, and get some feedback. There's a large roadmap of upcoming stuff. Feel free to DM me on X for more information!

    2024 · rx.run

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