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Dev tools · alternatives · 2026

24 alternatives to Yapi – FOSS terminal API client for power users

I shared a previous version of yapi a few months ago in the comments section of a post talking about the insanity of Postman being 'down'. yapi has developed into a more mature project since then! https://github.com/jamierpond/yapi Still very early, but it makes me much more productive vs Postman, Bruno, Insomnia, etc. If youre a nvim/tmux culture human, you might like this!

Yapi is an open-source terminal API client designed for developers who work in Neovim and tmux environments. It provides an alternative to graphical API testing tools like Postman and Insomnia, offering command-line… 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

    Hi HN! I just released version 1.0 of Posting, an open source terminal application I've been working on which you might find useful if you work with, test, or develop HTTP APIs! Posting (https://github.com/darrenburns/posting) is an HTTP client, not unlike Postman and Insomnia. However, as a TUI application, it works over SSH and enables efficient keyboard-centric workflows. Your requests are stored locally in simple readable YAML files, meaning they're easy to read and version control. Some other features include: - "Jump mode" navigation - Environments/variables…

    2024 · github.com · its alternatives →

  2. 2

    Build, test, and document your APIs faster

    2016 · postman.com · its alternatives →

  3. 3

    Hi HN! I'm Greg and I've been working on Yaak for just over a year. I usually describe it as a Postman alternative since most developers are familiar with that, but it's targeted more toward users that just want an API client (no mocking, testing, spec design, etc). Having also created Insomnia for a similar purpose, I never thought I'd build another API client again. But, after selling Insomnia in 2019 and watching it expand into the broader feature set of Postman, I was left wanting a simpler tool again. Yaak was my answer to that. It's hard to describe how it's better than the 100 other…

    2025 · yaak.app · its alternatives →

  4. 4

    I built PrettyMux as a native Linux terminal workspace for multitask workflows and keeping track of my agents. It’s a GTK4 app built on Ghostty/libghostty, with split panes, workspaces, vertical tabs, notifications, project-aware tabs (shows favicons/logo automatically), and an in-app browser so terminals and docs/tools can live side by side. I started it because I wanted something tmux-like for modern GUI workflows on Linux, but native and not Electron, there is cmux but only available on macos (prettymux compiles on windows and macos too but not tested for now there) It’s…

    Apr 2026 · prettymux.com · its alternatives →

  5. 5
    Paw 3▲336

    The most advanced API tool for Mac

    2016 · its alternatives →

  6. 6
    Hey!▲367

    AI-powered pair programming friend

    2024 · github.com · its alternatives →

  7. 7

    While "burning tokens" isn't necessarily a good thing, I thought it worthwhile to throw together a quick leaderboard to track the dev setups of the top HN token burners. Jesse (https://en.wikipedia.org/wiki/Jesse_Vincent), Wes (https://en.wikipedia.org/wiki/Wes_McKinney), and Harper (https://en.wikipedia.org/wiki/Harper_Reed) are using it to report their Claude/Codex usage.

    2024 · tkmx.odio.dev · its alternatives →

  8. 8
    Apidog▲570

    Development teams often struggle with using multiple tools like Postman and Swagger for API design, development, and testing. This fragmented approach leads to outdated API specs and chaotic collaboration. So we built Apidog: a single, unified API platform for team collaboration. It has a beautiful interface that makes it easy to create API spec, generate request data from API spec, validate responses, create mock data, orchestrate test scenarios, and publish API documentation. Apidog = Postman + Swagger + Mock + JMeter.

    2024 · apidog.com · its alternatives →

  9. 9
    Postman▲182

    Postman is a powerful HTTP client to test REST API

    2014 · postman.com · its alternatives →

  10. 10

    Hey, HN! With all recent agentic workflows being primarily terminal- and tmux-based, I wanted to share a little project I created about decade ago. I've continued to use this as my primary terminal "window manager" and wanted to share in case others might find it useful. I would love to hear about other's terminal-based workflows and any other tools you may use with similar functionality.

    Jan 2026 · github.com · its alternatives →

  11. 11

    Session manager for tmux. Load, freeze, and convert tmux sessions through YAML/JSON configuration files. Powered by libtmux. Quickstart Install and run your first command. Quickstart CLI Reference ...

    2017 · tmuxp.git-pull.com · its alternatives →

  12. 12

    Author here. RMUX started from a frustration: I've used tmux for years and got tired of scraping output with grep and sleeps to automate anything. So I rebuilt the multiplexer from scratch in Rust, with a programmable layer on top. Two surfaces: a tmux-compatible CLI (~90 commands, your keybindings just work), and a typed async Rust SDK on the same daemon — stable pane IDs, structured snapshots, locator-style waits. The idea is Playwright-style automation, but for terminals. Native on Linux, macOS, Windows (real ConPTY, no WSL). Demos and docs at rmux.io. Happy to answer questions about the…

    May 2026 · github.com · its alternatives →

  13. 13

    Encrypted terminal and SSH client with built‑in AI assistant

    Jan 2026 · apxterminal.com · its alternatives →

  14. 14
    Dapi▲83

    A workplace for building API together

    2021 · expireddomains.com · its alternatives →

  15. 15

    List of awesome API clients. Postman and Insomnia alternatives - stepci/awesome-api-clients

    2023 · github.com · its alternatives →

  16. 16

    Hey HN, Small OSS project that i created for myself and want to share with the community. It's a declarative, scriptable, terminal-based IDE focussed on agentic engineering. That's a lot of jargon, but essentially its a multi-agent IDE that you start in your terminal. Why is that relevant? Thanks to tmux and SSH, it means that you have a really simple and efficient way to create your own always-on coding setup. Boot into your IDE through ssh, give a prompt to claude and close off your machine. In tmux-ide claude will keep working. The tool is intentionally really lightweight, because I think…

    Mar 2026 · tmux.thijsverreck.com · its alternatives →

  17. 17

    Bring the power of Grok into your terminal

    2025 · github.com · its alternatives →

  18. 18

    Design, preview and track API with the team

    2021 · expireddomains.com · its alternatives →

  19. 19

    hey guys. the other day i was migrating hosting providers and i just needed something not too heavy and convenient to spin up my backups for awhile and realised there is almost nothing out there. kimchi hasn't been updated for years and cockpit is heavy. so here's something i came up with in a couple hours because of a sudden urge, nothing fancy just basic creation with cloud init, lifecycle management and image/storage, but it's modern-ish and it compiles to a 8.4mb binary inclusive of the embedded web UI, CLI and API, and only dep is libvirt.

    2025 · github.com · its alternatives →

  20. 20

    Explore a highly curated API marketplace focused on reliability, scalability, and quality. Access AI & Machine Learning, Content, Finance, Stock, and more APIs.

    2015 · any-api.com · its alternatives →

  21. 21
    Tabby▲103

    A terminal for a more modern age

    2019 · tabby.sh · its alternatives →

  22. 22TT
  23. 23
    Yaak▲10

    The API client for modern developers

    2024 · yaak.app · its alternatives →

  24. 24

    It's based on the jediterm library developed for IDEs, but it can also be put to work as a standalone terminal emulator with tabs. The library has been around for more than 10 years, but I don't think anyone made a terminal emulator app from it?

    2025 · github.com · its alternatives →

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