# Contrasta — WCAG & APCA, fully offline

> WCAG & APCA, fully offline (iPhone/iPad app by 永 张.)

- Source: https://appshunter.io/ios/app/contrasta/id6787083893 (this page in markdown: same URL + `.md`)
- Developer: [永 张](https://appshunter.io/developer/1806535769)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-07-14
- Data updated: 2026-07-21
- User reviews in markdown: https://appshunter.io/ios/app/contrasta/id6787083893/reviews.md

## What is Contrasta?

Contrasta checks color contrast the moment you pick a color — no account, no internet, no waiting for a web tool to load.

Pick a foreground and background with the color picker, hex entry, or a built-in eyedropper that samples a color straight from any photo in your library. Contrasta instantly shows the WCAG 2.x contrast ratio with AA/AAA pass badges for normal text, large text, and UI components, plus a live text preview so you can see exactly how legible your pairing really is.

Designers and developers use Contrasta to sanity-check a brand palette before it ships, catch a low-contrast button during a design review, or verify a color pairing meets accessibility guidelines without leaving their phone.

Included
• Foreground/background color picker, hex entry & photo eyedropper
• WCAG contrast ratio with AA/AAA/UI component pass badges
• Live text preview at multiple sizes
• Swap & shuffle colors
• Save up to 3 color pairs

Pro (one-time unlock)
• APCA Lc score — the modern perceptual contrast metric proposed for WCAG 3
• Simulate protanopia, deuteranopia, tritanopia & achromatopsia
• Batch tab — check every saved color pair against WCAG & APCA at once
• Unlimited saved color pairs
• Export a shareable contrast report

Fully offline. Zero tracking. No subscription.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Contrasta Pro | $4.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-07-14

No release notes.

## More apps by 永 张

- [PhotoBridge: NAS & S3 Backup](https://appshunter.io/ios/app/photobridge-nas-and-s3-backup/id6754593211)
- [SipNote: Caffeine Tracker](https://appshunter.io/ios/app/sipnote-caffeine-tracker/id6759808330)
- [LoopSnap: GIF & Sticker Maker](https://appshunter.io/ios/app/loopsnap-gif-and-sticker-maker/id6763897111)
- [NearBeam: Local File Transfer](https://appshunter.io/ios/app/nearbeam-local-file-transfer/id6777431459)
- [Lumio — Fast Camera](https://appshunter.io/ios/app/lumio-fast-camera/id6777431967)
- [Urlescent](https://appshunter.io/ios/app/urlescent/id6781143625)

All apps by 永 张: https://appshunter.io/developer/1806535769

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-21.*