UD5 Toolkit
Color Readability Tester - Online Visual Contrast Meter
Paste body text and test different font/background combos. See an actual passage rendered, not just a ratio. True feel for legibility.
Tag: Readability Score & Grade Level
4+ toolsText Readability Scorer - Online Flesch-Kincaid & ARI Calculator
Compute multiple readability scores (Flesch Reading Ease, Grade Level, ARI, SMOG). Paste any English text and see which grade level it's suitable for. Local.
Print Readability Calculator – Online Minimum Font for Distance
Enter viewing distance to get the minimum readable print font size. Design posters and signs.
Readability Analyzer - Online Flesch-Kincaid & SMOG Index
Paste text to compute reading ease and grade level using Flesch-Kincaid, SMOG, and ARI. Improve your writing clarity. All in browser.