I built a Function Themer for the Web Version of Epicor Kinetic:
Epicor Function Maintenance went live for the web today and I went in to try it out. The editor works well. The thing that got me is there’s no theming or styling at all. It’s the default light look with no option to change it, and I spend most of my day in here, so I made my own.
It’s a Tampermonkey userscript. It themes both the Monaco code editor and the studio shell around it (panels, grids, headers, breadcrumbs, scrollbars), so the whole screen matches instead of a dark code area sitting in a white frame.
There are 41 themes built in. Dracula, Nord, Gruvbox, Tokyo Night, Catppuccin, Solarized, and a bunch of others, plus some light ones. There’s a dropdown next to the Test Function button. Pick a theme and it applies right away, and it remembers your choice on the next reload.
It only runs on the Function Studio page, so the rest of Epicor is left alone. It works on any *.epicorsaas.com tenant. It’s cosmetic only, just CSS and the dropdown injected at runtime, and it doesn’t touch your data, functions, or anything server side.
GitHub repo, with install steps in the README: GitHub - Zellington3/Epicor-Kinetic-Web-Function-Maintenance-Themer: Epicor Kinetic Web Function Maintenance Themer for V2026.100 · GitHub
You’ll need the Tampermonkey browser extension first. Then grab the epicor-function-studio-theme.user.js file from the repo and add it one of two ways: go to the Utilities tab in Tampermonkey and use Import from file, or create a new script and paste the contents in. Both are in the readme. One thing to watch on Chrome and the other Chromium browsers, Tampermonkey won’t run anything now unless Developer Mode is on, so check that if it looks like nothing is happening. That’s noted in the readme too.
If you want to tweak the colors or add your own theme, they’re all in one object near the top of the script.
A few previews:
Theme Selector (Located beside Test Function at top right):
Dracula
Gruvbox Dark
Nord
Tokyo Night
Catppuccin Mocha
One Dark
GitHub Light (light theme)
