Calmly Writer Online
calmlywriter.com
A blank page with a focus mode that dims everything but this sentence
No sign-upOn device
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calmlywriter.com
A blank page with a focus mode that dims everything but this sentence
chatgpt.com
The general assistant most people mean when they say they used AI
claude.ai
Anthropic's assistant, strongest on long documents and careful writing
grammarly.com
Catches the grammar and tone problems you stop seeing in your own draft
hemingwayapp.com
Highlights the sentences nobody is going to finish reading
languagetool.org
Open-source grammar checking across more than twenty languages
onelook.com
Finds the word you mean when you can only describe it
quillbot.com
Rewrites a sentence you cannot get right into several alternatives
rewordify.com
Rewrites difficult English into simpler words, keeping the meaning
wordcounter.net
Counts words and characters, and shows which words you overuse
Where these come from
A real job usually crosses two or three categories, which is why starting from the task is often faster than starting from the shelf.
Questions
Separate the passes. Draft somewhere with nothing on the screen, then run a grammar and readability check, then a final read on a different device. Tools that try to do all three at once mostly interrupt the first one.
Yes — 6 of the 10 sites listed here work with no account at all. They are marked "No sign-up" and you can spot them by the green rule down the left edge of the card.
3 of these do the work inside your browser and never upload the file — those are the ones to use for anything with personal data in it. The rest send your input to their servers, which is fine for public material.