MIT. The whole thing, for everyone.
RackMon is free and open source under the MIT licence. There is one edition, it has every feature, and there is no licence key to buy, enter or renew — including for commercial use.
What the MIT licence lets you do
- Run it for any purpose, commercial included, on as many instances as you like, with no device limit.
- Read, modify and fork the source. It is all on GitHub — backend, frontend and tests.
- Redistribute it, modified or not, and charge for what you build with it — including monitoring you operate for your own clients.
- Rebrand it. White-label branding is a feature of the product, not a paid add-on: your name, your logo, your colour.
The only condition is the usual one: keep the copyright notice and the licence text with the copies you distribute. The full text is in LICENSE and it is shorter than this page.
What it does not give you
- No warranty and no liability. MIT software is provided as-is. RackMon watches your racks; deciding what to do about a 38 °C inlet is still your job, and if it misses something, that risk is yours.
- No contractual support. I read and answer every issue on GitHub, usually quickly, but nothing here promises a response time. If you need one in writing, say so and we will talk about it.
- No trademark rights. You can fork the code and call your fork whatever you like; please do not call it RackMon.
There used to be a Pro edition
Until 1 November 2026 RackMon was open-core: the monitor was free and five features — SSO, LDAP, SLA reports, the public status page and white-label branding — needed a paid key. That model is retired, and the reason is worth being straight about: in several months it got twenty-two installations and zero sales. A product nobody uses is not fixed by charging less for it.
- Everything that was Pro is now simply in the product, switched on, for everybody.
- If you still have
RACKMON_LICENSE_KEYin your.env, leave it. It is read and ignored, so nothing breaks on upgrade. - If you ever paid for a key, email me and I will refund it. Nobody did, so this paragraph is here for completeness.
Third-party code
RackMon stands on open source: FastAPI, SQLAlchemy, pysnmp, React, Vite and Tailwind, among others. Their own licences — permissive, and listed in the dependency files in the repository — apply to those parts, and MIT applies to RackMon's own code.