Clear writing is rewriting. This tool takes dense text and rewrites it at the reading level you choose, using your own OpenAI or Anthropic key, then estimates the Flesch-Kincaid grade before and after so you can see the change — all in your browser.
How it works
Choose a provider and model, paste your API key, drop in your text, and pick a target grade level from very simple (grade 5) to specialist (grade 13+). The tool estimates the current reading grade locally, then sends one direct request asking the model to rewrite at your target level using shorter sentences and simpler words while preserving meaning, facts, and any keywords you list. It estimates the new grade on the result so you can compare.
For Anthropic, the request includes the official direct-browser-access header so it works straight from the page.
What Flesch-Kincaid measures
The grade level is driven by two things: how long your sentences are and how many syllables your words have. Shortening sentences and swapping long words for short ones lowers the grade — which is exactly what the rewrite targets.
Tips
- Aim for grade 7-9 for general audiences; most successful web copy sits there.
- Use the keyword field to protect terms that must stay exact — drug names, legal terms, product names.
- The local grade estimate is a guide, not gospel; read the rewrite aloud as the real test of clarity.