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Top 23 C Simd Projects
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john
John the Ripper jumbo - advanced offline password cracker, which supports hundreds of hash and cipher types, and runs on many operating systems, CPUs, GPUs, and even some FPGAs
Project mention: John the Ripper jumbo – advanced offline password cracker | news.ycombinator.com | 2025-09-09 -
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kimi-k3-in-c
A 2.78-trillion-parameter Kimi K3 running inference on a single CPU in 8.24 GB of RAM. Portable C99: no BLAS, no framework, no GPU.
Project mention: How a 176 KB C Binary Runs a 2.78-Trillion-Parameter Model on One CPU with 8 GB of RAM | dev.to | 2026-08-05 -
StringZilla
Up to 100x faster strings for C, C++, CUDA, Python, Rust, Swift, JS, & Go, leveraging NEON, AVX2, AVX-512, SVE, GPGPU, & SWAR to accelerate search, hashing, sorting, edit distances, sketches, and memory ops 🦖
Project mention: Don't stop early: Case-folding source code at memory speed | news.ycombinator.com | 2026-08-04Interesting, how does it compare with StringZilla? It has highly optimized case-fold and case-insensitive Unicode search kernels as well: https://github.com/ashvardanian/Stringzilla
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XNNPACK
High-efficiency floating-point neural network inference operators for mobile, server, and Web
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42_CheatSheet
A comprehensive guide to 50 years of evolution of strict C programming, a tribute to Dennis Ritchie's language
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NumKong
SIMD-accelerated distances, dot products, matrix ops, geospatial & geometric kernels for 16 numeric types — from 6-bit floats to 64-bit complex — across x86, Arm, RISC-V, and WASM, with bindings for Python, Rust, C, C++, Swift, JS, and Go 📐
Usearch (Smaller & Faster Single-File Similarity Search & Clustering Engine for Vectors & 🔜 Texts): https://github.com/unum-cloud/usearch
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UCall
Web Serving and Remote Procedure Calls at 50x lower latency and 70x higher bandwidth than FastAPI, implementing JSON-RPC & REST over io_uring ☎️
Yes, I was planning a similar experiment with UCall (https://github.com/unum-cloud/ucall), leveraging the NUMA functionality introduced in v2 of Fork Union. I don’t currently have the right hardware to test it properly, but it would be very interesting to measure how pinning behaves on machines with multiple NUMA nodes, NICs, and a balanced PCIe topology.
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I'm sorry, that second reference was actually for the 3.5ULP variant. The 1 ULP is here: https://github.com/shibatch/sleef/blob/master/src/libm/sleef...
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I wrapped zsv, a SIMD-accelerated CSV parser written in C, into a Ruby gem. SIMD means it uses special CPU instructions to process multiple bytes at once - the same tech that makes video encoding and game physics fast.
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Project mention: RayforceDB – a pure C analytics database with a Lisp-like syntax | news.ycombinator.com | 2026-08-14
It's a little weird to truncate the history [0] of your open source project and lock the v1 commits in a separate repo with limited access [1]. Are the authors embarrassed of the commit history? Trying to hide how much was developed with Claude?
[0] https://github.com/RayforceDB/rayforce/pull/166
[1] https://github.com/RayforceDB/rayforce2/blob/master/README.m...
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sh4zam
Fast linear algebra and math library for the Hitachi SuperH4 Processor (used by the Sega Dreamcast).
Project mention: SH4ZAM – Fast Math Library for the Sega Dreamcast's SH4 CPU | news.ycombinator.com | 2026-03-16 -
Project mention: despacer: C library to remove white space from strings as fast as possible | news.ycombinator.com | 2026-05-13
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Simd discussion
C Simd related posts
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Don't stop early: Case-folding source code at memory speed
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What it takes to transpose a matrix
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despacer: C library to remove white space from strings as fast as possible
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We rewrote our Rust WASM Parser in TypeScript – and it got 3x Faster
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Faster Asin() Was Hiding in Plain Sight
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Ruby CSV Parsing 5-6x Faster
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Sleef: Building a Sustainable Future for Our Open Source Projects
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A note from our sponsor - SaaSHub
www.saashub.com | 16 Aug 2026
Index
What are some of the best open-source Simd projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | john | 13,499 |
| 2 | kimi-k3-in-c | 4,794 |
| 3 | StringZilla | 3,530 |
| 4 | simde | 3,074 |
| 5 | cglm | 2,994 |
| 6 | XNNPACK | 2,421 |
| 7 | 42_CheatSheet | 2,005 |
| 8 | NumKong | 1,872 |
| 9 | UCall | 1,330 |
| 10 | sleef | 842 |
| 11 | TurboPFor | 836 |
| 12 | hh-suite | 627 |
| 13 | simdcomp | 533 |
| 14 | streamvbyte | 417 |
| 15 | zsv | 395 |
| 16 | nsimd | 344 |
| 17 | Turbo-Base64 | 336 |
| 18 | TurboRLE | 290 |
| 19 | rayforce | 261 |
| 20 | sh4zam | 222 |
| 21 | despacer | 158 |
| 22 | simd_utils | 120 |
| 23 | utf8 | 85 |
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