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C3Rust
Free

Free and open source; the compiler and standard library use LGPL-3.0 and MIT licences.

 Free

Free and open source.

Windows, Linux, Web, Command line Windows, macOS, Linux, Command line
  • Syntax close to C, with a C-to-C3 guide
  • Optionals, generics and compile-time reflection
  • Memory and thread safety checked at compile time
  • No garbage collector, suited to performance-critical and embedded work
  • Pre-1.0 language that may still change
  • Smaller ecosystem than C or C++
  • Ownership model takes time to learn
  • Compile times can be long on large projects
Downloadable app, Web application Downloadable app
Open source Open source
License: LGPL-3.0-or-later, MIT License: MIT OR Apache-2.0
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 23, 2026

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