Hemingway Editor
hemingwayapp.com
Highlights the sentences nobody is going to finish reading
No sign-upOn device
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calmlywriter.com
A blank page with a focus mode that dims everything but this sentence.
A distraction-free editor that hides its own interface until you move the mouse, with a focus mode that fades every paragraph except the one you are writing and an optional typewriter clack if that helps. Documents live in browser storage or save directly to a local file. It does headings, lists and Markdown, and deliberately nothing else.
Questions
Works the moment the page loads. No account, no email, no trial. Documents live in browser storage unless you save to a file, and the free web version does not sync between devices.
No. Calmly Writer Online does the work inside your browser, so the file never leaves your device — you can load the page, disconnect from the network, and it still works. That makes it a reasonable choice for material containing personal data.
Documents live in browser storage unless you save to a file, and the free web version does not sync between devices.
Alternatives
Same category or same task, ordered by how closely they overlap.
hemingwayapp.com
Highlights the sentences nobody is going to finish reading
onelook.com
Finds the word you mean when you can only describe it
wordcounter.net
Counts words and characters, and shows which words you overuse
grammarly.com
Catches the grammar and tone problems you stop seeing in your own draft
languagetool.org
Open-source grammar checking across more than twenty languages
quillbot.com
Rewrites a sentence you cannot get right into several alternatives