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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.
| StackEditstackedit.io | Calmly Writer Onlinecalmlywriter.com | Hemingway Editorhemingwayapp.com | OneLookonelook.com | |
|---|---|---|---|---|
| What it does | A Markdown editor with live preview that keeps working offline | A blank page with a focus mode that dims everything but this sentence | Highlights the sentences nobody is going to finish reading | Finds the word you mean when you can only describe it |
| What it costs you | 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. | 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 your device | Runs on your device | Runs on your device | Runs on their server |
| Where it stops | Documents sit in browser storage by default, so clearing site data without a linked cloud account loses them. | 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. | Results are ranked statistically, so a vague description returns a long list you have to read through yourself. |
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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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