Compare software

ProWritingAidLanguageTool
Freemium

Free to start, with a paid version that unlocks the full toolkit.

 Freemium

A free tier is available and the engine is open source. Premium features are paid.

Web, Browser extension Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Style and line-editing feedback beyond basic grammar
  • Story planning and critique tools for fiction
  • The checking engine is open source and can be self-hosted offline
  • Covers far more languages than most grammar checkers
  • Full feature set requires a paid plan
  • Geared toward fiction, less so toward other writing
  • The hosted service sends your text to their servers unless you self-host
  • Advanced style suggestions and long texts need a paid plan
Downloadable app, Web application, Browser extension Browser extension, Downloadable app, Self-hosted
Closed source Open source
License not stated License: LGPL-2.1
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 22, 2026

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