Grammarly
Superhuman (formerly Grammarly)Writing assistant for grammar, clarity and tone across apps
by AI21 Labs
Sentence-level rewriting that keeps your meaning and adjusts tone
Wordtune focuses on the sentence. Highlight a line and it offers several rewrites that preserve the meaning while changing length, formality or phrasing, which makes it useful for tightening prose you have already written rather than generating new material. It also includes a summariser for long documents and web pages, spices for adding an example or counterargument into a paragraph, and a browser extension that works in email and document tools. Later additions cover reading and summarising uploaded PDFs. It suits professionals who write in a second language, anyone whose first draft is wordy, and people who want editing help without a tool rewriting whole documents for them. The limitations are scope and volume: it is not designed for long-form generation, the free tier allows only a small number of rewrites each day, and suggestions on technical or highly specific sentences are often too generic to use.
Sign up at wordtune.com and install the browser extension, since the tool is most useful where you already write rather than in its own editor. Write your sentence first, however clumsily, then highlight it and pick from the rewrite list; the options split into casual, formal, shorten and expand. That order matters, because the tool improves existing thinking rather than supplying it. Use the shorten option on anything over about twenty-five words, which is where most business writing loses readers. The summariser takes a long article or uploaded document and returns key points you can click through to the source passage, which is more reliable than asking a general assistant to summarise without citation. Two things to note: the free plan caps daily rewrites and they run out quickly during editing sessions, and the extension needs permission per site, so it will appear inactive in a tool until you enable it there explicitly.
Writing assistant for grammar, clarity and tone across apps
Paraphrasing, summarising and grammar tools for students and writers
Workspace for documents, databases and projects with a built-in assistant
Assistant focused on careful reasoning, long documents and writing