Compare Pyright to these popular alternatives based on real-world usage and developer feedback.

TypeScript is a language for application-scale JavaScript development. It's a typed superset of JavaScript that compiles to plain JavaScript.

It adds syntactic sugar inspired by Ruby, Python and Haskell in an effort to enhance JavaScript's brevity and readability. Specific additional features include list comprehension and de-structuring assignment.

Flow is a static type checker for Javascript created by Facebook.

It is 100% compatible with Ruby. It type checks normal method definitions, and introduces backwards-compatible syntax for method signatures. Explicit method signatures make it useful for anyone reading the code. Type annotations serve as a tool for understanding long after they're written.