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OpenCart 3 Extension

Light/dark theme customizer for OpenCart admin

Live

Let store owners live-customize color schemes and toggle light/dark mode — no template code, no core-file patches.

PHP OpenCart MySQL

Version 1.1.0

5 built-in color-scheme presets
10 individually adjustable color pickers
0 core template files patched
v1.1.0 current release
How It Works

How it works

1

Install via OCMOD

Upload the extension as a standard OpenCart 3 OCMOD package — no manual file edits.

2

Pick a preset or customize

Choose one of 5 built-in presets, or fine-tune all 10 individual colors from the admin settings screen.

3

Instant, flash-free switch

The theme class is injected before the page renders and cached in localStorage, so visitors never see a flash of the wrong theme.

Features

What's included

5 built-in presets

Default Light, Midnight Dark, Slate Dark, Ocean Light, Graphite Dark.

10 individual color pickers

Background, sidebar, header, accent, border, and text colors, each independently adjustable.

Flash-free theme switching

Theme class is injected before <body> renders, with settings cached in localStorage for instant reapply.

Zero core-file patches

Integrates via an OpenCart core event hook instead of patching admin template files.

Event-hook architecture

Registers on OpenCart's own admin/view/common/header/after event — the same mechanism core extensions use — instead of OCMOD find/replace patching.

Dual-layer caching

Settings are stored in the database as the source of truth, with a localStorage cache for instant client-side reapply.

Per-admin-user themes

Colors and scheme are stored per admin user, not site-wide — every admin gets their own theme.

Input sanitization

Every color value is validated against a strict hex format before it's saved or rendered, guarding against CSS/HTML injection.

Screenshots

See it in action

Presets and the 10-color picker grid, light admin theme Presets and the 10-color picker grid, light admin theme The same settings screen switched to dark mode The same settings screen switched to dark mode The floating customizer button, visible on every admin page The floating customizer button, visible on every admin page
Pricing

Pricing

OpenCart 3 License

Single-store license

Buy on OpenCartCode →
FAQ

Frequently asked questions

Which OpenCart version is this tested against?
OpenCart / ocStore 3.0.3.9 specifically — every CSS selector is verified directly against that version's official source.
Does it modify OpenCart's core files?
No — it integrates via OpenCart's native event system, so core files are never touched and core upgrades stay safe.
How is the flash-free switch achieved?
Theme colors are written into the page before <body> renders, and the theme class is applied by an inline script before the browser paints anything — so there's no flash of the wrong theme.
Where do I find it in the admin?
A floating paint-brush button appears in the bottom-right corner of every admin page, with a link through to the full settings screen.
What happens if the license server is unreachable?
License checks are cached for 24 hours, and the extension keeps working during an outage rather than locking you out.

Ready to customize your admin panel?

One license, every color you need.