AI Readability Checker
Score AI output or a prompt for reading ease and grade level.
Language models tend to write long, abstract sentences that score badly for readability, and dense text is harder for people to trust and act on. This flesch reading ease tool scores any writing you paste — a ChatGPT answer, a prompt, a draft — giving a live reading ease number and grade level, so you can catch machine text that's grown too dense before it ships. Use it as a text grade level checker on AI output, or a readability score calculator to see whether your prompt is clear enough to get a clear answer back.
Your text
Nothing is uploaded — the score is worked out in your browser as you type.
Flesch reading ease
-69.0
Very hard · higher is easier (0–100)
- Grade level
- 31.3
- Reads like
- Postgraduate
- Words / sentence
- 34.0
- Words · sentences
- 34 · 1
This reads dense — a common AI-writing tell
Long sentences and abstract, multi-syllable words push the grade level up and the reading ease down. If this is model output, ask for shorter sentences and plainer words; if it's your prompt, tightening it usually gets a clearer answer back.
Flesch reading ease and Flesch–Kincaid grade level are computed from sentence length and syllables per word — the same maths spell-checkers use. Aim for 60+ ease (roughly grade 8) for general readers. Syllable counting is a heuristic, so scores are indicative, not exact, and a good score is not proof text is human-written.
How it works
- 1
Paste the text
Drop in AI output, a prompt or any writing. The scores update on every keystroke, so you can edit a sentence and watch the reading ease climb.
- 2
Read the scores
The headline is the Flesch reading ease, from 0 (very hard) to 100+ (very easy), with a plain-language band. Beside it you get the grade level, the school stage it reads like, and words per sentence.
- 3
Fix dense writing
If the text reads dense, the tool flags it — a common AI-writing tell. Shorten the long sentences and swap abstract, multi-syllable words for plainer ones, and rescore until it lands where you want.
Instant & 100% private — nothing is uploaded
Every calculation runs locally in your browser. The prompts, token counts and numbers you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.
Frequently asked questions
- What is a good Flesch reading ease score?
- For a general audience, aim for 60 or above, which reads at roughly a US grade 8 level. Scores of 30 to 50 read like difficult, college-level prose; below 30 is very hard going. Marketing and help content usually want 60–70, while technical docs can sit a little lower.
- How does this differ from a normal readability checker?
- The maths — Flesch reading ease and Flesch–Kincaid grade level — is the same standard measure. The angle here is AI text: model output and prompts tend toward long sentences and abstract vocabulary that score poorly, so the tool flags dense writing as a signal to simplify, whether that's a ChatGPT answer or the prompt you fed it.
- Can this detect if text was written by AI?
- No, and nothing reliably can. A low reading ease is a hint that text reads like dense machine output, but plenty of humans write that way too, and a good score doesn't prove text is human-written. Use it to improve clarity, not to judge authorship.
- How is the grade level worked out?
- The Flesch–Kincaid formula combines average sentence length with average syllables per word: longer sentences and wordier vocabulary push the grade up. Syllable counting uses a heuristic that's close but not perfect, so the score is a solid guide rather than an exact measurement. Editing for shorter sentences and simpler words is what moves it.
Important
For planning and estimates only. Prices come from a published rate table dated on the page; providers change pricing without notice, and token counts here are approximations. Confirm against the provider’s own pricing before you budget or commit.
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