Seedfast fills a development, CI, or demo database with realistic, relational test data generated from the schema itself. One command connects to your database, reads the live schema, and writes a dataset the database accepts on the first insert. Foreign keys point at rows that exist, composite keys and multi-level dependencies resolve, check and unique constraints hold, enums stay inside the values they allow, and triggers are accounted for rather than tripped over.
The realism comes from reading the schema first. Seedfast works out what the data is meant to represent from table names, column names, types and constraints before it generates any of it. A table called orders with status, total_amount and placed_at gets plausible order statuses, monetary amounts on a realistic distribution rather than uniform random, and timestamps spread across a sensible window. A table called patients with date_of_birth and diagnosis_code gets medical data instead. There is no per-domain configuration to pick, and no user1@test.com placeholder filler.
Scope is plain text, written in whatever language you think in: "seed 500 Slovak customers, +421 phone numbers, emails on acme.sk, invoices numbered INV-2026-0001 upward". Generated values follow the same rule. Ask for Japanese customer names and that is what the column fills with; ask for German postal addresses and they come back shaped the way German addresses are shaped, not a US layout with the words swapped out. Phone country codes, email domains you control, internal SKU patterns, prefixed invoice counters, URLs pointing at a staging host: anything a column holds can be described in a sentence and generated to match. Say nothing about any of it and Seedfast still picks a coherent default out of the schema, then holds it steady for the whole run.
Volume belongs to the same scope. Fifty rows for a local branch, a million for load testing, tens of millions when the tables need to weigh what production weighs, enough to reproduce the working set of a large, high-traffic product, where index choices start to matter and a query plan that held over ten thousand rows can flip at fifty million. Realism does not degrade as the row count climbs.
Nothing is copied from production, so teams in fintech, healthcare and other regulated settings can work against data that behaves like the real thing without a masking pipeline or a security review to clear first. Seedfast does not copy, mask, or de-identify existing production rows; it generates new ones. When a migration changes the schema, the next run picks it up, so there is no seed file to keep in step.
The same command runs locally, as a step in a CI pipeline (GitHub Actions, GitLab CI, CircleCI), or as an MCP server that AI coding agents such as Claude and Cursor invoke as a tool.
Pricing is flat monthly tiers based on table count, with no metering and no per-row charges, starting with a 30-day free trial that needs no card.
