Readability Scores
Compute Flesch, Gunning Fog, Coleman-Liau, and other readability scores for any text.
About Readability Scores
Readability Scores measures how hard your writing is to read, computing Flesch, Gunning Fog, Coleman-Liau, and other established indices for any text. Reach for it when you want concrete numbers on whether a draft suits its audience — a marketing page, a help doc, or a school assignment. It runs in your browser and returns every score as JSON.
- Category
- text
- Input
- Accepts: text/plain.
- Output
- Outputs: application/json.
- Cost
- Free, runs in your browser
- Memory
- low
Common uses
- Check that website copy reads at a broad, accessible grade level before publishing
- Tune a help article down to a simpler reading level for a general audience
- Verify that an essay or report hits a required readability target
- Compare two drafts to see which one reads more easily
- Audit legal or technical text that may be too dense for its readers
- Set an editorial readability standard and measure new content against it
Frequently asked questions
Which scores does it compute?
Flesch Reading Ease, Gunning Fog, Coleman-Liau, and other common readability indices, returned together as JSON.
Is my text sent anywhere?
No. The scores are computed in your browser from your text, so nothing is uploaded.
What do the scores actually mean?
Most map text to a US grade level or an ease rating based on sentence length and word complexity. Lower grade levels and higher Flesch ease scores mean easier reading.
What input format does it accept?
Plain text. Paste your draft or feed in text extracted from another document.
Does it work for non-English text?
These formulas are calibrated for English. Scores on other languages won't be meaningful.
How is this different from Text Statistics?
Text Statistics gives raw counts like words and syllables; this turns those into established readability indices that estimate reading difficulty.
Keywords
- readability
- flesch
- fog
- grade
- level
- score
- writing
- complexity