Fearless SIMD
Ranked 3 of 3 SIMD libraries by recommenders
Portable SIMD library for Rust that runs on stable, letting developers use CPU vector performance without writing their own low-level code.
Portable SIMD library for Rust that runs on stable, letting developers use CPU vector performance without writing their own low-level code.
8 people gave an opinion
- recommend it
- 8
- criticize it
- 0
- approval share
- 100%
Recommended in 3 of 13 months
- November 2025: not recommended
- December 2025: not recommended
- January 2026: not recommended
- February 2026: not recommended
- March 2026: not recommended
- April 2026: not recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it doesn’t carry the badge
- 8 people recommend itNeeds 10 or more, not met.
- Nobody criticizes itNeeds 2 to 1 or better, met.
- Recommended in 3 of 13 monthsNeeds 4 or more, not met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Portable SIMD that runs on stable Rust
“we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable”
Comment from 10 Aug 2026 in “Rust SIMD on the GPU” “Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust”
Comment from 24 Sep 2026 in “Fearless SIMD v1.0” Ergonomic access to CPU performance
“Tools like this are really nice for being able to leverage the gigantic performance modern CPUs make available”
Comment from 24 Sep 2026 in “Fearless SIMD v1.0” “enabling your extreme optimization use case, just more ergonomically”
Comment from 27 Sep 2026 in “The state of SIMD in Rust in 2026” No need to write SIMD yourself
“Fearless SIMD 1.0 came out a few days ago so people won't have to implement it themselves anymore.”
Comment from 28 Sep 2026 in “The state of SIMD in Rust in 2026” “if you're looking to add SIMD to your Rust code, that's the package to start with.”
Comment from 22 Jul 2026 in “Everyone Should Know SIMD”
Other SIMD libraries people recommend
The two most recommended other SIMD libraries, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Google Highway | 15 | 5 | 75% | 8 | — | Approved |
| std::simd | 13 | 13 | 50% | 4 | — | — |
| Fearless SIMDThis page | 8 | 0 | 100% | 3 | — | — |
What people said
9 of the 10 comments that mention it, newest first. Each links to the original comment.
“It's the closest thing to Google's Highway.”
“Fearless SIMD 1.0 came out a few days ago so people won't have to implement it themselves anymore.”
“enabling your extreme optimization use case, just more ergonomically”
“Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust”
“Have been really happy with Fearless simd”
“Tools like this are really nice for being able to leverage the gigantic performance modern CPUs make available”
“Pretty happy this broke the 0.x curse!”
“we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable”
“if you're looking to add SIMD to your Rust code, that's the package to start with.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.