JCPatch

by BV Studios · bjornv.com · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Run custom JavaScript and CSS on any site, automatically.

Users

store count

Rating

5.0 / 5

unchanged in 30 days

Ratings

total ratings

Store rank

#264K

#220K among extensions

Version

1.2.0

updated 8 Oct 2026

Users

monthly, 1 months

Latest, 16 Oct 2026: 4 usersMove the mouse over the chart for any month

Ratings count

monthly, 1 months

Latest, 16 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About JCPatch

JCPatch lets you customize any website with your own JavaScript and CSS. Write your code in the built-in sidebar editor, choose where it should run, and it applies automatically every time you visit. Target a single page, a whole domain, or anything in between. Add /* to the end of a URL to match every page beneath it, for example example.com/blog/*. Your scripts and styles are stored locally on your device. JCPatch does not collect or transmit any data. Only run code you wrote or trust.