About

A free readability calculator that actually shows its work.

Readability Check scores your writing across six industry-standard readability formulas — Flesch Reading Ease, Flesch–Kincaid Grade, Gunning Fog, SMOG, Coleman–Liau, and the Automated Readability Index — and highlights every sentence that drags the score down so you know exactly where to cut.

Why this exists

Most online readability calculators give you a number and stop there. That tells you something is wrong but not what to fix. This tool annotates your text sentence by sentence: easy ones in green, borderline ones in amber, the offenders in red. Long sentences and complex words are flagged inline so revising takes seconds, not minutes.

How it works

Everything runs in your browser. The text you paste never leaves your device — no server, no logs, no analytics on the content itself. The six formulas are pure math, computed on the client side, so results appear as you type with no network round-trip.

Who built it

Built and maintained by Clinton Munkres, a data governance practitioner based in the United States. The code is hand-written, hosted on Cloudflare, and intentionally framework-free.

Get in touch

Questions, feature requests, or bug reports go to [email protected] or use the contact page.