About this tool
Two of the oldest, most-cited readability metrics — Flesch Reading Ease (higher = easier) and Flesch-Kincaid Grade Level (target audience grade). Useful when tuning a landing page or an AI's tone.
How it works
- The tool counts words, sentences, and syllables (using a fast heuristic).
- It computes both scores from the standard formulas.
- A qualitative label maps the Flesch score to a rough audience level.
When to use it
- Making sure your marketing copy is at 8th-grade reading level.
- Constraining an LLM's output to a target reading level via prompt tuning + scoring.
- Benchmarking two variants of an article intro.