Letterproof

About this app

Made for a clear purpose.

Letterproof grades the type around you.

Point the camera at a menu, sign, slide deck, print proof, worksheet, UI mockup, or screen. Letterproof finds each visible line of text and rates it against WCAG 2.2 accessibility contrast thresholds.

Each reading shows:

- AAA, AA, or FAIL verdict - Exact contrast ratio, such as 4.51:1 - Sampled text and background colors - Estimated text size - A color-coded overlay on the source image - A practical contrast fix when a region falls below AA

Letterproof is useful for designers checking a proof, teachers or parents reviewing low-vision readability, content teams reviewing signage or brochures, and anyone curious whether text in the real world is actually readable.

Built privacy-first:

- Vision text recognition runs on your iPhone or iPad - WCAG math runs on your iPhone or iPad - Photos and camera frames are not uploaded by the app - No account, sign-in, ads, tracking, analytics, or subscription - Audit history is saved locally on your device

WCAG thresholds checked:

- AA: 4.5:1 for normal text, 3:1 for large text - AAA: 7:1 for normal text, 4.5:1 for large text - Large text is treated as approximately 18 pt or larger

Settings let you review results against an AA or AAA target. One-time purchase, no subscription.