Readability Checker

Check readability with sentence-length and vocabulary measurements, and see exactly which sentences are hurting the score.

0 words

Tested against

  • Turnitin
  • GPTZero
  • Originality.ai
  • Copyleaks
  • ZeroGPT
  • Winston AI
  • Scribbr
  • Writer
  • Sapling
  • Crossplag
  • Content at Scale

The readout covers average sentence length, its variance, average word length and common-word share, the inputs behind every standard readability formula, plus a per-sentence view so you can see where the difficulty is concentrated.

One thing worth knowing: very high readability and very even sentence lengths both push a draft toward reading as machine-written. Optimising a readability score too hard makes the AI signal worse, which is a trade-off no readability tool tells you about.

FAQ

We report the underlying measurements rather than a single graded formula, because the inputs are what you can act on. Sentence length and word length drive nearly all of them.

Depends entirely on the audience. Aim for variance rather than a number, writing where every sentence is equally easy reads as machine-generated.

Often it raises it. Simplification tends to flatten rhythm and raise word predictability, which are two of the strongest signals detectors read.

The writing analysis and your Style DNA run in your browser. For a real AI score, the text you check is sent to an AI-detection provider, and we never store it. When you rewrite on a paid plan, the draft is sent to our server, rewritten and sent back without being stored. AI features (rewriting, humanizing and Copilot) send the text to Cloudflare Workers AI, which processes it and doesn't keep it.

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