Schemity

Schemity is database design software for software engineers and their AI agents.

Understand your schema. Connect a live PostgreSQL, Supabase, MySQL, MariaDB, SQL Server, SQLite, CockroachDB, Cloudflare D1 or Snowflake database and see it as an editable ERD, grouped into a Context Map by domain. Import SQL, DBML, or models from Navicat, DbSchema, MySQL Workbench and Visual Paradigm.

See the impact of every schema change. Before a migration runs, Schemity lints it and shows the affected rows, rewrites, dependencies and failing statements, plus the exact migration SQL.

Design the next one. Draw it yourself, or let Claude Code, Cursor or Codex propose it through Schemity's local MCP server. Agents read the schema and stage changes for you to review, without access to your database.

Native app for macOS, Windows and Linux. Works offline and air-gapped, no schema upload. One-time purchase, no subscription, 2-week free trial.