Wordtune

Wordtune is an AI writing companion developed by AI21 Labs that focuses on sentence-level rewriting and refinement. Rather than generating content from scratch, Wordtune excels at taking your existing draft and offering multiple alternative phrasings, each optimizing for a different quality — casual tone, formal tone, shorter version, or expanded version.

This makes it particularly useful for non-native English speakers who have the ideas but struggle with natural phrasing. Wordtune's Read & Summarize feature can process long documents, YouTube videos, and web articles, distilling them into concise summaries with key points.

The tool integrates via a browser extension that works across Gmail, Google Docs, Slack, LinkedIn, and most text fields on the web. Wordtune Spices adds a creative layer that can generate analogies, counterarguments, examples, and statistical facts to enrich your writing.

The platform recently introduced Wordtune Editor, a full document editor with AI assistance built in, competing more directly with long-form writing tools. Its free tier offers 10 rewrites per day, making it accessible for light users who want occasional phrasing help.