The glass reads through whatever sits behind it. Start with Horizon, or pick your own.
Suggested
JSON Formatter
Format & Validate
Base64 Encode/Decode
Encode & Decode
URL Encode/Decode
Hash Generator
Generators
UUID Generator
Unix Time Converter
Inspect & Debug
JWT Debugger
RegExp Tester
Check WCAG colour contrast compliance
Large text at 24px
Normal body copy at 14px — this is the harder test to pass.
Small print at 12px
6.79
Contrast ratio