Chrome Extension Chrome Web Store

Measure contrast exactly as it appears on screen.

Just drag and drop over the area you want to check.

The tool analyzes pixels as they render on screen and automatically detects foreground and background colors. Images, gradients, transparency, overlapping elements—areas that are difficult to assess with traditional HTML/CSS-based tools—are now visible as users actually see them.

In addition to WCAG 2.1 / 2.2 contrast evaluation, we also support APCA.

View a page's structure at a glance.

Headings, links, landmarks, accessible names, ARIA states—assistive technology essentials are gathered in Chrome's side panel for easy review.

Rather than flooding the page with markers, you can identify issues while maintaining a bird's-eye view of structure.

In environments with Chrome's built-in AI, you can also see hints for fixing detected issues.

From writing correctly to communicating clearly.

Convert complex Japanese into easy-to-read expressions with one click.
Readability scoring analyzes your text, visually highlighting overly long sentences, difficult vocabulary, and kanji density.
Also supports furigana, word spacing, and summarization.
It combines tools that help readers understand and tools that support writers. Processing—including AI—happens entirely in the browser, so your text stays private and never reaches external servers.