Playground
Try it on a sample database — no credentials needed
Lumastack is a realistic demo SaaS database: 200 accounts, 18 months of payments, product usage, and support tickets — with real-world problems hidden inside. Ask questions in plain English and watch the answers come back as tables, charts, and dashboards.
Sign up, choose “Try with sample data first” — you're querying within a minute. No credit card, no database credentials.
Questions worth asking it
Why is revenue lower this month than last month?
Which accounts stopped using the product in the last 30 days?
Show failed payments by week — is there a spike?
Which plan has the highest churn rate?
List urgent support tickets that are still open
Build a dashboard of MRR by month
The dataset has stories to find: a failed-payment spike in the last three weeks, a dozen accounts whose usage quietly dried up, and a refund cluster denting last month's revenue. If the AI is any good, it should find them. That's the point.
A real schema, not a toy
Six related tables — accounts, users, subscriptions, payments, product events, support tickets — with joins, foreign keys, and 40,000+ rows.
Dashboards and alerts too
Pin any answer as a live dashboard, or set an alert — “tell me when failed payments spike” — exactly like you would on your own database.
Then connect for real
When you connect your own database it's read-only by default, and only your schema — never your rows — reaches the AI.
Two minutes to your first answer
Free plan, no credit card. The sample database is waiting.
Open the playground