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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.
| Reedsy Studioreedsy.com | Grammarlygrammarly.com | QuillBotquillbot.com | Calmly Writer Onlinecalmlywriter.com | |
|---|---|---|---|---|
| What it does | Write a book in chapters and export a properly typeset EPUB and PDF | Catches the grammar and tone problems you stop seeing in your own draft | Rewrites a sentence you cannot get right into several alternatives | A blank page with a focus mode that dims everything but this sentence |
| What it costs you | Free accountFree to use, but you have to register before it will do the job. | Free accountFree to use, but you have to register before it will do the job. | 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. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on your device |
| Where it stops | Built for books only, and the export templates are a small fixed set you cannot restyle. | Free covers spelling, grammar and punctuation; clarity rewrites, tone adjustment and the plagiarism check are Premium. | Free paraphrasing takes only a short passage per pass and unlocks just two of the rewriting modes. | Documents live in browser storage unless you save to a file, and the free web version does not sync between devices. |
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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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