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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| LanguageToollanguagetool.org | Grammarlygrammarly.com | Calmly Writer Onlinecalmlywriter.com | Hemingway Editorhemingwayapp.com | |
|---|---|---|---|---|
| What it does | Open-source grammar checking across more than twenty languages | Catches the grammar and tone problems you stop seeing in your own draft | A blank page with a focus mode that dims everything but this sentence | Highlights the sentences nobody is going to finish reading |
| What it costs you | No sign-upWorks the moment the page loads. No account, no email, no trial. | Free accountFree to use, but you have to register before it will do the job. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. |
| Your files | Runs on their server | Runs on their server | Runs on your device | Runs on your device |
| Where it stops | The free tier caps how much text you can check in one pass and holds the rewriting features for Premium. | Free covers spelling, grammar and punctuation; clarity rewrites, tone adjustment and the plagiarism check are Premium. | Documents live in browser storage unless you save to a file, and the free web version does not sync between devices. | The free web version has no saving, no export and no rewriting — those live in the paid desktop app. |
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| Category | Writing & Text | Writing & Text | Writing & Text | Writing & Text |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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