fastrand

A simple and fast random number generator

2.5.0 841M downloads/mo #74 most downloaded on crates.io smol-rs/fastrand

What this package is like to depend on

Last release 1 months ago

19 Jul 2026

Release timing varies

gaps range from 4 weeks to 1.3 years

Nearly every release is documented

notes for 29 of 29 stable releases

1 version withdrawn

withdrawn after publishing

6 years old

30 releases · first in 2020

3 releases in the last 12 months

see the full history below

Release timeline

30 releases · May 2020 to Jul 2026

2021 2022 2023 2024 2025 2026

Release Pre-release Withdrawn

Releases

latest 30

2.5.0 19 Jul 2026
Release notes
- Update getrandom to 0.4. (#131)
Open source →
Release notes
- Update getrandom to 0.4. (#131)
Open source →
2.4.1 07 Apr 2026
Release notes
- Fix build failure with js feature. (#125)
Open source →
Release notes
- Fix build failure with js feature. (#125)
Open source →
2.4.0 04 Apr 2026 withdrawn
Release notes
- Bump MSRV to 1.63. (#104)
- Improve quality of f32/f64 generation. (#103)
- Add f{32,64}_inclusive and Rng::f{32,64}_inclusive. (#103)
- Make Rng::with_seed const. (#107)
- Update getrandom to 0.3. (#104)
Open source →
Release notes
- Bump MSRV to 1.63. (#104)
- Improve quality of f32/f64 generation. (#103)
- Add f{32,64}_inclusive and Rng::f{32,64}_inclusive. (#103)
- Make Rng::with_seed const. (#107)
- Update getrandom to 0.3. (#104)
Open source →
2.3.0 08 Dec 2024
Release notes
- Accept IntoIterator in choose_multiple functions instead of just Iterator. (#92)
Open source →
Release notes
- Accept IntoIterator in choose_multiple functions instead of just Iterator. (#92)
Open source →
2.2.0 08 Nov 2024
Release notes
- Expose missing fill method for the global RNG. (#90)
Open source →
Release notes
- Expose missing fill method for the global RNG. (#90)
Open source →
2.1.1 23 Aug 2024
Release notes
- Remove support for 128-bit targets, as they are not supported by rustc yet. (#87)
Open source →
Release notes
- Remove support for 128-bit targets, as they are not supported by rustc yet. (#87)
Open source →
2.1.0 27 Apr 2024
Release notes
- Change the RNG algorithm and the way that the seed is computed. This will cause
  the algorithm to emit different constants for different seeds, hence the minor
  SemVer change.
  - Update to the final WyRand v4.2 constants for better entropy. (#82)
  - Remove an unnecessary seed modification. (#73)
Open source →
Release notes
- Change the RNG algorithm and the way that the seed is computed. This will cause the algorithm to emit different constants for different seeds, hence the minor SemVer change.
  - Update to the final WyRand v4.2 constants for better entropy. (#82)
  - Remove an unnecessary seed modification. (#73)
Open source →
2.0.2 24 Mar 2024
Release notes
- Slight restructuring of the with_seed function. (#79)
Open source →
Release notes
- Slight restructuring of the with_seed function. (#79)
Open source →
2.0.1 25 Sep 2023
Release notes
- Clarify documentation for the fork() method. (#62)
- Mention fastrand-contrib in documentation. (#70)
Open source →
Release notes
- Clarify documentation for the fork() method. (#62)
- Mention fastrand-contrib in documentation. (#70)
Open source →
2.0.0 09 Jun 2023
Release notes
- Breaking: Remove interior mutability from Rng. (#47)
- Add a fork() method. (#49)
- Add a no_std mode. (#50)
- Add an iterator selection function. (#51)
- Add a choose_multiple() function for sampling several elements from an iterator. (#55)
- Use the getrandom crate for seeding on WebAssembly targets if the js feature is enabled. (#60)
Open source →
Release notes
- Breaking: Remove interior mutability from Rng. (#47)
- Add a fork() method. (#49)
- Add a no_std mode. (#50)
- Add an iterator selection function. (#51)
- Add a choose_multiple() function for sampling several elements from an iterator. (#55)
- Use the getrandom crate for seeding on WebAssembly targets if the js feature is enabled. (#60)
Open source →
1.9.0 14 Feb 2023
Release notes
- Add Rng::fill() (#35, #43)
- Add #[must_use] to Rng::with_seed() (#46)
Open source →
1.8.0 23 Jul 2022
Release notes
- Add get_seed() and Rng::get_seed() (#33)
Open source →
1.7.0 22 Jan 2022
Release notes
- Add char() and Rng::char() (#25)
Open source →
1.6.0 19 Dec 2021
Release notes
- Implement PartialEq and Eq for Rng (#23)
Open source →
1.5.0 19 Jul 2021
Release notes
- Switch to Wyrand (#14)
Open source →
1.4.1 24 Apr 2021
Release notes
- Fix bug when generating a signed integer within a range (#16)
Open source →
1.4.0 03 Oct 2020
Release notes
- Add wasm support.
Open source →
1.3.5 01 Sep 2020
Release notes
- Reword docs.
- Add Rng::with_seed().
Open source →
1.3.4 08 Aug 2020
Release notes
- Implement Clone for Rng.
Open source →
1.3.3 07 Jul 2020
Release notes
- Forbid unsafe code.
Open source →
1.3.2 26 Jun 2020
Release notes
- Support older Rust versions.
Open source →
1.3.1 26 Jun 2020
Release notes
- Tweak Cargo keywords.
Open source →
1.3.0 26 Jun 2020
Release notes
- Add f32() and f64().
- Add lowercase(), uppercase(), alphabetic(), and digit().
Open source →
1.2.4 18 Jun 2020
Release notes
- Switch to PCG XSH RR 64/32.
- Fix a bug in gen_mod_u128.
- Fix bias in ranges.
Open source →
1.2.3 17 Jun 2020
Release notes
- Support Rust 1.32.0
Open source →
1.2.2 17 Jun 2020
Release notes
- Use std::$t::MAX rather than $t::MAX to support older Rust versions.
Open source →
1.2.1 17 Jun 2020
Release notes
- Inline all functions.
Open source →
1.2.0 17 Jun 2020
Release notes
- Add Rng struct.
Open source →
1.1.0 28 May 2020
Release notes
- Switch to PCG implementation.
- Add alphanumeric().
- Add seed().
Open source →
1.0.0 27 May 2020
Release notes
- Initial version
Open source →

fastrand

What this package is like to depend on

Release timeline

Releases

Every package, every release, already written down.