# Kefir C compiler

8 Hacker News commenters recommended Kefir C compiler and 1 criticized it, November 2025 to November 2026. It was recommended in 2 of 13 months.

**Verdict:** Small C compiler praised for passing the full GCC torture tests and its test suite. Caveat: critics say public development stopped and it became proprietary.

## Why people recommend it

- Passes GCC torture tests and test suite (2 comments): "One of the very few small compilers which passes the full gcc torture tests" ([source](https://news.ycombinator.com/item?id=48356445)) "The test suite alone is pretty impressive." ([source](https://news.ycombinator.com/item?id=47839954))
- Fantastic, impressive single-developer project (3 comments): "I think it is fantastic to have more compiler implementations." ([source](https://news.ycombinator.com/item?id=47838751)) "Very impressive for a single dev project." ([source](https://news.ycombinator.com/item?id=47844422)) "I agree on it being fantastic." ([source](https://news.ycombinator.com/item?id=47838949))
- Optimizing compiler with new pipeline (2 comments): "it looks like a great (even optimizing) compiler" ([source](https://news.ycombinator.com/item?id=48360522)) "Congrats for the new optimizing pipeline" ([source](https://news.ycombinator.com/item?id=47843574))
- Useful extra compiler for testing (2 comments): "these could have been avoided with just an automatic build job in the CI with kefir or slimcc" ([source](https://news.ycombinator.com/item?id=47843925)) "I think it is fantastic to have more compiler implementations." ([source](https://news.ycombinator.com/item?id=47838751))

## Alternatives hackers recommend

- [Fil-C](https://hackerapproved.com/p/fil-c.md): 160 recommend
- [Claude's C Compiler](https://hackerapproved.com/p/claude-s-c-compiler.md): 39 recommend
- [Visual C++](https://hackerapproved.com/p/visual-c-plus-plus.md): 29 recommend
- [Tiny C Compiler (TCC)](https://hackerapproved.com/p/tcc.md): 22 recommend
- [Microsoft Visual C++ compiler (MSVC)](https://hackerapproved.com/p/msvc.md): 20 recommend

## Cite as

Hacker Approved, "Kefir C compiler", https://hackerapproved.com/p/kefir-c17-c23-compiler/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).