What do I actually get for free?
The rulebook itself. You can author it, validate it, and walk through the methodology without paying anything — hosting and paid seeds are the only things that ever cost money.
The free tier is the rulebook: the single JSON source of truth for your domain — schema, data, lookups, aggregations, formulas, and closure fields — plus the methodology for tending it.
That is not a crippled trial; it is the most important artifact in the whole system. A well-tended rulebook is portable (it's a file in your repo), reviewable (git diff), and LLM-tendable. Everything else — the generated Postgres database, the APIs, the running app — is projected from it.
Good places to start:
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Getting started walks the first loop end-to-end.
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Seeds are complete, clonable starting points — real rulebooks with real derived fields, not blank scaffolds.
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Pricing shows exactly what's free and what isn't, before you add anything.