About ReadTime
What is ReadTime?
ReadTime is a zero-backend, fully client-side readability analyzer. Paste your text or drop a file, and instantly get a Flesch-Kincaid readability score, reading time estimate, content statistics, and issue highlights — all computed in your browser. No signup, no data leaves your device.
Flesch-Kincaid Formulas
ReadTime uses two standard readability metrics:
Reading Ease
206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)
Score range: 0–100 (higher = easier to read)
Grade Level
0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59
Approximate US school grade level needed to understand the text
Reading Ease Interpretation
90–100Very Easy— 5th grade — general public
70–89Easy— 6th grade — blog / newsletter
60–69Standard— 7th–8th grade
50–59Fairly Difficult— 10th–12th grade — high school
30–49Difficult— College — academic
0–29Very Confusing— Graduate — very technical
Issue Detectors
ReadTime checks for four types of writing issues:
WarningLong Paragraphs — paragraphs over 150 words
WarningLong Sentences — sentences over 35 words
InfoRepetitive Openers — consecutive sentences starting with the same word
InfoPassive Voice — common passive constructions (was/being + past participle)
Privacy & Technology
- • Fully client-side — your text never leaves your browser
- • No accounts, no tracking, no server-side processing
- • Analysis history saved locally via localStorage (last 20 entries)
- • Built with Next.js 15, React 19, TypeScript, and Tailwind CSS v4
- • Syllable counting uses a heuristic algorithm (~85-90% accuracy)