Readability Checker
Eight standard formulas on one screen, plus the structural numbers they are built from — so you can see whether a hard score comes from long sentences or long words.
Rewriting Mode
Simple: Clear and easy to read. This mode does not combine short sentences, or vary repeated transition words.
Eight Formulas Because They Disagree
Readability formulas disagree, which is why this tool reports eight of them rather than one: Flesch Reading Ease, Flesch-Kincaid grade level, Gunning Fog, the SMOG index, the Automated Readability Index, Coleman-Liau, Linsear Write and Dale-Chall.
Each weighs sentence length and word length differently, so a text that scores badly on all eight has a real problem, while a split verdict usually points at one specific cause.
The Raw Inputs Behind Each Score
Alongside them you get the raw inputs: word, sentence, character and syllable counts, average sentence length, average word length, vocabulary diversity as a type-token ratio over alphabetic words, estimated reading time at 200 words per minute, and the share of sentences in the passive voice, identified from the dependency parse rather than from word endings.
Plain-Language Labels for Every Band
Scores are labelled in plain language too — Very Easy through Very Confusing for Flesch, Elementary through Graduate for grade level.
How Sentences Are Counted
Sentence counting uses its own segmentation so that short sentences are not silently dropped, which matters when short sentences are exactly what you added.
Common Use Cases
- Checking a blog post against a target reading level before publishing
- Verifying documentation is readable by a non-specialist
- Measuring reading level for a plain-language or accessibility requirement
- Finding out whether difficulty comes from sentence length or vocabulary
- Measuring the passive-voice share of a draft
How It Works
Paste your text
Up to 5,000 characters; a few paragraphs give the most stable scores.
Read all eight formulas
Agreement across them means a real difficulty; disagreement points at the cause.
Check the raw inputs
Average sentence length and passive share tell you what to actually fix.
Rewrite and re-measure
Simple mode caps sentences at 20 words; the scores update for both versions.