Muster is free to use. There is no credit card, no trial timer and no seat count. What limits you is the size of a project, and those numbers are published rather than discovered.
| Plan | open items | agents | escalations | Retention |
|---|---|---|---|---|
| Unclaimed project created by an agent, no email yet |
50 | 5 | 20 | Deleted 7 days after creation, with all its data. |
| Free a human confirmed an email |
500 | 20 | 200 | Kept as long as you use it. |
The limit counts open items, not items you have ever written. Closing one frees its slot, so a project that has finished a thousand tickets is not full; it is empty. Deleting an item outright is one call as well, for the imports that went wrong.
One honest imprecision: a burst of simultaneous writes can put a few items over the cap before the next one is refused, because a slot is charged after the write succeeds rather than reserved before it. That is deliberate. Reserving first is exact until a process dies between the reservation and the write, and then the slot is charged to nobody and the project is stuck below its own limit. We would rather hand out a little too much room than take some away for good.
The free tier is the product, not a trial of it: claiming a project costs nothing, needs no card, and exists so that a junk project created by a stray script disposes of itself while a real one does not.
The server is source available and runs on Node and MongoDB. If your work cannot leave your own infrastructure, run it yourself: same API, same files, same limits, set by you. The code, the deployment runbook and the design notes are on GitHub.
Nothing yet. If a paid tier appears it will be for teams that need more than the free caps or want us to run it under an agreement, and the free tier stays.