Haip PMS - Open-source hotel PMS you self-host, no per-room fees

I spent a while looking at what independent hotels actually pay for software and it is absurd. $15-30 per room per month, multi-year contracts, and the API is deliberately thin so you cannot leave. A 50-room property pays thousands a year for the privilege of reading its own reservation data.

So we built HAIP and open sourced it under Apache 2.0. It is a real PMS, not a demo shell - reservations, folio and billing, rate plans with LOS/CTA restrictions, housekeeping, night audit, accounting and cashiering, channel distribution, and a commission-free direct booking engine so a hotel takes reservations from its own site instead of handing an OTA 15-25%.

The agents in it are deliberately not LLMs. Revenue, overbooking, cancellation prediction, night audit anomaly detection - all deterministic engines that log every decision and calibrate to each property's own history. There is an optional small local model on top that explains those numbers in plain language, off by default, running entirely on your own hardware, and it cannot invent a figure the agent did not compute.

There is also a sister project, OTAIP (Open Travel AI Platform), which is the travel-side infrastructure. OTAIP agents connect into HAIP over a Connect API. The PMS works fully without it.

git clone, docker compose up, and you get a seeded demo hotel on localhost:3000. Only prerequisite is Docker. Happy to answer anything.