Last checked October 15, 2026

LanguageTool

LanguageTool finds grammar and spelling issues in many languages. The editing core is LGPL-2.1. A premium plan adds more rules and removes public-API limits. The server can be self-hosted.

Open sourceLGPL-2.1 (core)WritersStudentsMarketers

Premium n-gram data and some service features are not the LGPL core.

WebMacWindowsLinuxiOSAndroidSelf-host

Website·Source

Free tier

The browser extension and a public checker are free, with rate limits. Premium removes those limits.

Hosted

Premium is a paid subscription. The current price was not copied from LanguageTool in this check. Unverified.

Self-host

Moderate. A Java server. Basic rules run without extra data. Large n-gram datasets improve suggestions and take disk. About $5–15/mo. Unverified estimate.

Drop-in scores

Replacing Grammarly100% of the checklist checked.

Sources checked

https://languagetool.org
https://github.com/languagetool-org/languagetool