Cascadea
A Safari extension and Mac editor for applying custom CSS styles to websites.
Useful for people who want per-site appearance control in Safari.
UserCSS variables, site rules and an integrated editor support both installing themes and writing your own.
Keep in mind: Website redesigns can break styles. Content Security Policy and Safari font restrictions can prevent some effects; this changes your local view, not the website for everyone.
Inside the app
Official product images
What you can do
- CSS, Stylus and Less editor
- UserCSS import, updates and per-site rules
- Appearance-linked styles and optional iCloud sync
Good for
- Safari users comfortable managing custom page themes.
Consider alternatives for
- People expecting a universal ad blocker or a theme that never needs maintenance.
Limitations & considerations
- Captured minimum: macOS 10.14.
- Website redesigns can break styles. Content Security Policy and Safari font restrictions can prevent some effects; this changes your local view, not the website for everyone.
Privacy & permissions
The extension can read and modify enabled pages to inject CSS. The developer says it does not collect browsing data; optional iCloud sync and Apple crash reports are separately described.
Sources & review notes Updated Nov 15, 2026
Reviewed by iApp4Me Editorial Team. Recommendations use the linked documentation and attributed accounts; device observations are identified separately.
- US App Store developer description
Complete description, release notes, download price and compatibility metadata captured 2026-11-02.
- Official developer disclosure
Full cached official text read, captured 2026-11-12. Historical edition, platform and publisher-wide scopes retained.
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