Grammarly vs LanguageTool
Compare Grammarly and LanguageTool on pricing, free tier, open source, API, self-host, verdict and momentum.
Both are writing tools. Grammarly is freemium (free tier (100 AI prompts/mo); Pro $12/mo (yearly)) with a free tier; LanguageTool is freemium (Free browser/editor with basic checks; Premium unlocks advanced style, grammar, and higher limits) with open source, an API, self-hostable and a free tier. The catalog stamp is situational for Grammarly and situational for LanguageTool, last verified 2026-08-24 and 2026-08-19 respectively.
Grammarly
Writing assistant for grammar, tone and clarity, everywhere you type.
LanguageTool
Open-source multilingual grammar, style, and spelling checker.
| field | Grammarly | LanguageTool |
|---|---|---|
| pricing | freemium · free tier (100 AI prompts/mo); Pro $12/mo (yearly) | freemium · Free browser/editor with basic checks; Premium unlocks advanced style, grammar, and higher limits |
| free tier | yes | yes |
| open source | no | yes |
| api | no | yes |
| self-host | no | yes |
| verdict | situational | situational |
| momentum | steady | steady |
| last verified | 2026-08-24 | 2026-08-19 |
| key limitation | Suggestions can flatten personal voice into corporate beige. | Free tier has a 2,000-character limit per check and fewer style rules. |
The call
Pick Grammarly for daily writing where typos and tone slips matter.
Pick LanguageTool if open source matters.
Grammarly sources
LanguageTool sources
Open live compare →Grammarly pageLanguageTool pageGrammarly.jsonLanguageTool.json