Compare software

LTeX+Harper
Free

Free and open source under the MPL-2.0 licence.

 Free

Free and open source.

Command line macOS, Web, Browser extension, Command line
  • Understands LaTeX, Markdown, Typst and many other markups
  • Works in any editor with an LSP client
  • All checks run locally with no telemetry
  • Works in browsers, editors and system-wide on macOS
  • Needs an editor client or command-line use; no standalone interface
  • Setup is more technical than a grammar app
  • English only
  • Rule-based checks do not rewrite text the way AI assistants do
Downloadable app Downloadable app, Web application, Browser extension
Open source Open source
License: MPL-2.0 License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Works offline

Checked October 2, 2026

Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.