Free English readability checker
Paste English text to check Flesch Reading Ease, Flesch-Kincaid grade level, word count, and sentence count. Online readability checks run on Numen's private Mac server and are deleted after processing.
The checker shows Flesch Reading Ease, Flesch-Kincaid Grade Level, word count, and sentence count for English text. Reading Ease scores run from difficult to easy. Grade Level estimates the U.S. school grade a reader may need.
Flesch-Kincaid uses sentence length and syllable counts to estimate reading level. It is useful for drafts, lesson material, support copy, and public pages where plain English matters.
No. Readability scores estimate how hard a passage is to read. They do not say who wrote it. If you need AI image detection, use the photo checker. If you need private text checks, use the iPhone or Mac app.
Native app
The Slop or Not app checks readability locally on Apple devices. English uses Flesch Reading Ease and Flesch-Kincaid Grade Level. German, Spanish, Italian, Swedish, Danish, and Norwegian use language-specific formulas.
Need to check a suspicious image instead? Try the online AI image detector.
