Readability · Free · In your browser
Score your writing with Flesch Reading Ease, Flesch-Kincaid, and Gunning Fog - and see exactly which sentences are dragging the grade level up.
A readability scorer estimates how hard your text is to read using formulas based on word and sentence length, reported as a school grade level.
Paste your writing - or try a sample:
0 words · 0 sentences
Consensus grade level
Paste text to score
Top hardest sentences
🔒 Runs entirely in your browser - open DevTools → Network and you'll see zero requests. Works offline. Nothing is uploaded.
The short version
There is no server and no upload. Everything runs with plain JavaScript on your device, so you can safely work with confidential or unpublished text. Open your browser's DevTools Network tab while you use it and you'll see zero requests - and it keeps working with your connection turned off.
In the margin
For general audiences, aim for a Flesch Reading Ease of 60–70 (roughly an 8th–9th grade level). Marketing and web copy often target an even easier score; technical writing can go higher, but shorter sentences almost always help.
Reading Ease returns a 0–100 score where higher is easier. Flesch-Kincaid converts the same inputs into a U.S. school grade level, so a result of 8.0 means an average 8th grader could read it.
No. Everything runs in your browser with plain JavaScript - your text is never uploaded, stored, or logged. Open your browser’s DevTools Network tab while you use it and you’ll see zero requests. The tool also works offline.
Margin note
Every tool here runs 100% in your browser. Open DevTools → Network while you use one and you'll see zero requests - your text never leaves your device. Prefer the deep dives? Read the writing on Penluma.