Readefine

Readefine attacks a specific, everyday annoyance: the web is written for someone else. News sites bury the point in jargon, product pages use terms you have never met, and recipes switch between Celsius and Fahrenheit depending on where the author lives. Readefine lets you decide how a page should read for you, then applies that decision automatically.

The engine has two layers. The first is a high-speed dictionary that maps thousands of words and phrases to preferred replacements. You can build your own dictionary or opt in to community dictionaries built by other users, so vocabulary tailored to a profession or region becomes reusable. The second layer is AI-driven rewriting, which handles jobs a fixed dictionary cannot: simplifying text for children, average adults, or ESL readers; summarizing; complexifying for a more demanding register; shifting tone toward professional, friendly, or sarcastic; or translating into languages including Spanish, Greek, Russian, and Latin. Unit conversion, such as Celsius to Fahrenheit, is handled as part of the same flow.

On top of the practical transformations, Readefine has a playful streak. You can have a page reworded as a pirate, a mob boss, or Yoda — a feature that is genuinely useful as a demonstration of how far the rewriting layer can push a text while keeping it readable. A paid subscription unlocks editing the AI prompts themselves, which turns Readefine from a fixed set of filters into a customizable rewriting engine. It is available as a browser extension and as a web app, and the extension is published by the owner of the listed website.