Catalogus

Design CSS gradients with multiple stops, linear/radial/conic modes, presets, favorites, and page preview.

Hash text locally with Web Crypto SHA-256, SHA-384, and SHA-512.

Inspect response headers for the active tab — security checklist, search, HEAD/GET, and export.

Generate secure passwords with custom length and character sets.

Stopwatch with lap times. Runs while the popup is open.

Reading progress bar with percent, milestones, colors, top/bottom placement, and per-site control.

Hover images on a page to see natural and displayed dimensions.

Convert text to a clean URL slug and copy it instantly.

Find HTML tables on the active page and export the selected one as CSV.

Decode JWT header and payload JSON locally without signature verification.

Find duplicate tabs in the current window and close extras, keeping the first.

Responsive viewport frames on the page — device presets, custom size, breakpoint guides, and saved frames.

Cap how many tabs can stay open per site (matches www/subdomains) and close extras.

Schedule URLs to open automatically on an hourly or daily basis.

Pick two elements and compare their key computed CSS styles side by side.

Auto-show a colored staging/production/local ribbon from hostname rules.

Save non-secret default values per site and field, then fill them with one click.

Track daily habits and streaks with a simple local checklist.

Click any element to hide it permanently on that site, with an undo list per host.

Query pasted JSON with simple JSONPath-style paths and copy the matches.

A simple local Todo / Doing / Done board with no account required.

Generate lorem ipsum paragraphs and placeholder names, emails, and phone numbers.

Generate likely email address patterns from a name and domain, fully offline.

Convert selected page content to Markdown locally and copy the result.