This page compares Korr with Grammarly and LanguageTool only on points checked in their own documentation, and gives the date of that check. It also says when another tool is the better choice.
| Korr | Grammarly | LanguageTool | |
|---|---|---|---|
| Price | Free | Free tier + paid | Free tier + paid |
| Account required | No | Yes | For premium |
| Usage limits | None | Limited (free) | 10,000 characters (free) |
| Works offline | Yes | No (cloud) | No (free tier) |
| Text stays on your device | Always | No | No (free tier) |
| Review each change | One by one | One by one | One by one |
| Personal dictionary | Yes, on your device | In your account | In your account |
| French | Yes | Yes | Yes |
| English | Yes | Yes | Yes |
| System-wide shortcut (desktop) | Yes (Ctrl+Alt+C) | Via app/extension | Browser + add-ons |
Comparison based on the free tiers, as of September 2026. Grammarly added multilingual suggestions in 2025, French included, on every plan. LanguageTool's free checker allows up to 10,000 characters per text.
Each line was checked against the vendors' own pages. Offers change: the date of the check is shown with the table.
If you write in a language Korr does not cover. LanguageTool supports more than thirty languages; Korr supports five. It can also run on your own server.
If you already use it across devices with an account, and having your text analysed on its servers is not a concern for you.
If you want correction with no account, no character limit and no server: the text stays on your device, and it keeps working offline.
Scribens, Reverso Corrector, Antidote and BonPatron are often compared too. We have not checked their current offers, so this page states nothing about their price, limits or privacy. Check their own sites.
Korr's accuracy is published with its method, including a benchmark written after tuning. We have not measured Grammarly or LanguageTool, so we make no claim about their accuracy. See Korr's numbers.
Yes. Korr is free, needs no account and has no character limit. It checks French, English, Spanish, Italian and Portuguese on your device.
Yes. Korr has no character limit. LanguageTool's free plan is limited per check; its self-hosted version is not, but it needs a server.
Korr works offline after the first load, on the website, in the Chrome extension and in the Windows app. LanguageTool can work offline when you host it yourself.