About
Give your data a vocabulary.
Enterprises are pouring AI on top of databases it can't actually reason about — undocumented columns, ambiguous joins and no governance. Sema is the missing layer that gives your data a vocabulary, so AI answers are correct, explainable and safe.
Sema started from a simple, repeated frustration: every "AI on your data" demo fell apart the moment it met a real warehouse with 1,200 cryptically named tables and no shared definition of a single metric.
We believe the answer isn't a smarter guess — it's a governed semantic layer the AI is forced to reason through. Define what your data means once, and every answer, report and alert resolves the same way, with the SQL and the audit trail to prove it.
How we build
Governed by default
Access control, masking and an audit log are on from the first query — not a future enterprise add-on.
Always explainable
Every answer ships with the SQL it ran and the tables it touched. No black boxes.
One source of truth
A metric means one thing across chat, reports, alerts and the API.
Built for scale
Designed for warehouses with thousands of tables, not toy demos.