Aria - Contrast Checker WCAG
WCAG AA/AAA accessibility tool
Free
The essential color contrast checker for designers and engineers.
Aria calculates the contrast ratio between text and background colors in real time,
letting you instantly verify compliance with WCAG 2.1 AA and AAA levels. Build
designs that reach every user, including those with color vision differences — fast.
◆ Key Features
[Real-Time Contrast Check]
Simply pick a foreground and background color to instantly calculate the contrast
ratio. Check AA (4.5:1) and AAA (7:1) compliance at a glance. Supports standards
for normal text, large text, and UI components.
[Intuitive Color Picker]
Built-in HSV color picker lets you visually adjust hue, saturation, and brightness.
Direct HEX code and RGB value input also supported. Fits right into your existing
design workflow.
[Save & Manage Color Combinations]
Save your favorite color pairs locally. Quickly recall the palettes you use
repeatedly across projects to keep your workflow efficient.
[Multilingual Preview Text]
Preview text in Japanese, English, and Korean to see how your design looks in
context. Instantly check contrast as font size or weight changes.
[Full Light / Dark Mode Support]
Syncs with system settings or switch manually. Verify accessibility for dark mode
UIs — all in one app.
◆ Perfect For
* Web designers who need WCAG and accessibility compliance
* All creatives involved in UI and UX design
* Front-end engineers and mobile app developers
* Teams managing design systems and style guides
* Anyone who cares about designing for users with color vision differences
◆ Supported Languages
日本語 ／ English ／ 한국어
Design inclusively. Reach more people.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Fixed minor bugs and improved overall stability.
The developer, 株式会社Tetrabox, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Tetrabox Inc.
- Size
- 19.4 MB
- Category
- Graphics & Design
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- ©2026 Tetrabox Inc.