I've been exploring Langfuse for a project and I'm really impressed with what's available in the open source repo. It seems fully functional.
But I keep coming back to this basic business question: how do they actually make money? If anyone can self-host the core platform for free, what's the incentive to pay them? Is it just support and hosting, or are there critical features kept out of the open source version?
That's a really smart question because it gets to the heart of how modern open-source companies work. You're right, the core is fully functional on its own.
From what I've seen, their main revenue streams are the managed cloud hosting (Langfuse Cloud) and their enterprise plan. The cloud offering removes the operational burden of self-hosting, which is a huge sell for teams without dedicated DevOps. The enterprise tier adds things like SSO, advanced user permissions, and guaranteed SLAs - features that big companies need but individual devs usually don't.
It's the classic open-core model. The free version gets you hooked and covers most use cases, but scaling in a serious, compliant business environment often means paying. Have you looked at their pricing page? It's pretty transparent about what's included in each tier.