Free · Slack

Slack /contrast

Drop two hex codes in Slack and get WCAG AA/AAA results from the same weableColor library that powers the free contrast checker on the web.
Slack /contrast reply showing 15.96:1 ratio and WCAG pass results

Add to your workspace

Click Add to Slack to install weableColor in your workspace, then run /contrast #fg #bg in any channel. (Install uses Slack OAuth — workspace admins may need to approve.)

Add to Slack

Workspace admins may need to approve the install.

Try it

  • /contrast

    Quick WCAG AA tip

  • /contrast #1a1a1a #f5f5f5

    Full ratio + AA/AAA checklist

  • /contrast #777 #fff

    Catch near-miss fails (e.g. AA normal)

For builders

Slash command Request URL (already wired on the weableColor Slack app):

https://weable.pro/api/slack/contrast

Bot scopes: commands, chat:write. Socket Mode off. OAuth callback: https://weable.pro/api/slack/oauth/callback.