Alternatives

Products that do what Fastify-zod, type-once, run everywhere (TypeScript/OpenAPI) does

1. 1FB
   FastAPI: build Python APIs with Go-like speed and automatic UI docs▲88

   2019 · fastapi.tiangolo.com

2. 21K
   1 KB JavaScript library for building front end apps▲242

   2017 · github.com

3. 3CJ
   Chardin.js, beautiful instructions for apps▲203

   2013 · heelhook.github.com

4. 4TT
   Typer, the FastAPI of CLI Apps▲10

   2020 · typer.tiangolo.com

5. 5FA
   FastWSGI, an ultra-fast WSGI server for Python▲89

   2021 · github.com

6. 6KB
   Kretes – Build full-stack applications in TypeScript and PostgreSQL▲81

   2020 · kretes.dev

7. 7QI
   Quicktype – it's like Uber, but for JSON▲34

   2017 · quicktype.io

8. 8FR
   Fastr – Reload Optimizing Chrome Extension▲67

   2018 · github.com

9. 9FL
   FastDom – Lightweight replacement of React and MobX▲41

   2019 · github.com

10. 10RA
    Runiq, a little Lisp-inspired language that runs on JavaScript▲24

    2015 · github.com

11. 11FS
    Flash – Speed Reading Web App Made with React/Next.js▲9

    2018 · producthunt.com

12. 12WA
    Web App for generating mocked data from an OpenAPI specification▲19

    2020 · github.com

13. 13UR
    UIGen – Runtime front end for any OpenAPI spec with AI skills▲5

    May 2026 · github.com

14. 14AT
    A TypeScript Playground for RX JS▲22

    2019 · blog.hediet.de

15. 15RO
    Running OpenFaaS Locally with Kind▲7

    2019 · github.com

16. 16LR
    Lightweight runtime types for vanilla JavaScript▲19

    2020 · github.com

17. 17QA
    Qew – a tiny queueing library written in TypeScript▲14

    2020 · github.com

18. 18SP
    Same PRD → bootable FastAPI app, zero LLM calls (600-line Python)▲5

    Jun 2026 · github.com

19. 19OA
    Openemacs – a tiny emacs clone, ≤ 1024 LOC (C), based on kilo (BSD)▲8

    2016 · github.com

20. 20OS
    Open-source project to convert FastAPIs to MCP servers▲7

    I built a zero-configuration tool for automatically exposing FastAPI endpoints as Model Context Protocol (MCP) tools, open to collabs and contributions!

    2025 · github.com

21. 21IB
    I Built a UI to finetune LLMs x100 faster▲7

    After fine-tuning GPT for a personal project, I realized how tedious it is to write plain text in a massive JSON file. That's why I built this app for my own use, and I want to see if others could benefit from a tool like this as well ;)

    2024 · finetuna-ui.com

22. 22GF
    Go framework with builtin OpenAPI support▲8

    2023 · github.com

23. 23CM
    Compiletime macro to auto generate fast validators for TypeScript types▲7

    2020 · github.com

24. 24FF
    FastAPI full-stack boilerplate with admin panel▲6

    2021 · github.com

Ranked by how close each launch is in meaning, then by votes. Refine with a description →