DataZen – a local-first client for cross-database workflows
Adds an AI teammate — NL2SQL, error fixes, EXPLAIN reading — to a lightweight local database client.
DataZen is a free, open-source desktop database client (under 15MB, sub-1-second startup) for PostgreSQL, MySQL, SQLite, Redis, MongoDB, and ClickHouse, with AI built into the actual query workflow rather than bolted on as a chatbot: it writes SQL from a plain-language request, explains and fixes broken queries, and reads EXPLAIN plans to suggest indexes. It ships a built-in MCP server so tools like Claude Desktop or Cursor can query your databases as agent tools, and doubles as an MCP client itself. Credentials stay AES-encrypted in the OS keychain, and you bring your own AI provider (OpenAI, Anthropic, DeepSeek, or a custom endpoint) — DataZen runs no cloud service of its own.
What holds up
- +Under 15MB and starts in under a second, versus 100MB+ for typical database clients.
- +Ships a built-in MCP server, so Claude Desktop, Cursor, or Cline can query your databases as tools.
- +Free and open source (GPLv3), where comparable AI-assisted clients are often paid.
- +Credentials stay AES-encrypted in the OS keychain — agents never see them raw.
Mind the limits
- −Needs your own AI provider API key (OpenAI, Anthropic, etc.) — the AI features aren't free themselves.
- −Only a handful of databases are built in; others require installing separate plugin drivers.
Featured here? Take the badge
Put it on your site — it links back to this review. Free for every listed product, always.
<a href="https://stillworks.dev/products/p/datazen-a-local-first-client-for-cross-database-workflows/"><img src="https://stillworks.dev/badge/datazen-a-local-first-client-for-cross-database-workflows.svg" alt="Picked by StillWorks" width="250" height="54"></a>