A modern theme for ISPConfig
ISPConfig Theme Customizer is a free, MIT-licensed add-on that gives the ISPConfig control panel a modern look and lets a host put its own name, logo and colours on it. It adds two designs, one of them with dark and light modes, and a Branding page for administrators, and it changes none of ISPConfig's own files. It is published as an independent open-source project.
Why a theme matters for a control panel
A control panel is the part of hosting that clients see every day. ISPConfig is a capable, free panel for running websites, mail and DNS across many Linux servers, and its standard interface has served it well for years. A host that offers ISPConfig to its own clients usually wants two things the stock look does not give it: a current, readable design, and its own brand on the login page and the panel.
What the add-on does
Two designs
- Clarity, the default, is a modern design with dark and light modes and a switcher in the panel. It is built on the design tokens and icons of VMware's open-source Clarity design system and uses the Inter typeface, served from the panel itself, so no external font, script or content delivery network request is added.
- Classic keeps ISPConfig's familiar look and makes it brandable.
A Branding page
Administrators get a Branding page where they set:
- the logo, with separate light and dark versions
- the panel name
- accent and navigation colours
- the login background and favicon
- the footer credits
Changes show in a live preview of the panel and the login screen before they are saved. The page is translated into seven languages: English, German, French, Spanish, Italian, Dutch and Portuguese. It stores its settings in ISPConfig's own configuration rather than adding database tables.
How it stays safe through upgrades
The add-on is additive: it ships no ISPConfig code and modifies none. That matters because ISPConfig updates replace its own files. After every ISPConfig upgrade, including patch releases, the installer is run again to put the theme back in place, and an uninstaller removes it cleanly.
One detail is worth knowing. ISPConfig's theme system needs a small version file inside the web root, which any third-party theme exposes. The repository includes nginx and Apache configuration snippets that block access to it, so the panel does not reveal its exact version to visitors.
What you need
| Requirement | Detail |
|---|---|
| ISPConfig | Version 3.3 (developed against 3.3.1p1; 3.2 not verified) |
| Access | A root shell on the panel server |
| Install | Clone the repository and run the install script |
| Licence | MIT; the bundled Clarity parts under MIT and Inter under the SIL Open Font License |
The add-on is not listed in ISPConfig's own Extension Installer; it is installed from its public repository. Once installed, each user chooses the design under Tools > User Settings > Design.
Why a theme like this helps
Free software gets better when the people who use it improve it in the open instead of working around it in private. A theme that any ISPConfig host can install, at no cost and with no change to the core, is the kind of contribution that makes the whole project stronger.
Issues and suggestions go to the add-on's repository. If you run ISPConfig on a Noiz Cloud server, our knowledgebase has an ISPConfig section covering day-to-day tasks.
Sources
Checked 19 October 2026.
Note: while some of this content was produced with the help of AI, the final editing has been done by a real human being.
