Letterproof

About Letterproof

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.