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Accessibility
Contrast, readability and speech helpers - 9 working tools
WCAG Contrast Checker
Check text and background colours against WCAG AA and AAA.
PX / REM / EM / PT Converter
Convert CSS units using your base font size.
Colour Blindness Simulator
See how a colour looks with common colour vision deficiencies.
Text to Speech
Read text aloud with the voices installed in your browser.
Readability Analyzer
Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI scores for English text, with word, sentence and syllable counts.
Dyslexia-Friendly Reader
Paste or open text and read it with adjustable font, spacing, line width, background tint and a reading ruler. Settings are remembered on this device.
Batch Contrast Checker
Check WCAG contrast for many colour pairs at once - or test every colour in a palette against every other. Exports CSV.
Alt Text Helper
A guided checklist for writing good image alt text, with a draft composer, a live quality check and an HTML snippet. It does not use AI to look at your image.
Transcription Editor
Type a transcript while an audio or video file plays: pause and rewind with keyboard shortcuts, slow the speed, insert timestamps and export TXT, SRT or VTT. Does not transcribe automatically.