Calculate Flesch Reading Ease scores and Flesch-Kincaid grade levels for copywriting.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Paste your article, blog post, or sales copy into the editor.
Review the Flesch Reading Ease score (0-100) and grade level classification.
Simplify complex sentences and multisyllable words to improve readability.
A score between 60 and 70 (approx. 8th to 9th grade reading level) is considered standard plain English for web articles.
It evaluates average sentence length (words per sentence) and average word complexity (syllables per word).
Zero-egress companion tools in the Text Utilities suite
Calculate US grade level comprehension using the Automated Readability Index (ARI) formula.
Strip accents and normalize European characters into plain ASCII Latin letters.
Encode and decode reversible ROT13 and custom Caesar cipher text strings.
Format scientific Markdown chemical formulas and mathematical exponents.
