Explain Plan Visualizer

Explain Plan Visualizer is a small, in-browser tool that turns database EXPLAIN output into an interactive graph and details view. Everything runs locally in your browser, so plan data never leaves your device.

Highlights

• Visualize query plans as an interactive graph.
• Inspect node details for deeper analysis.
• Runs entirely in-browser with zero data upload.

Supported Databases

• PostgreSQL
• DuckDB

How To Get A Plan PostgreSQL:

EXPLAIN (ANALYZE, FORMAT JSON, VERBOSE, BUFFERS)
[your-query]

DuckDB:

EXPLAIN (ANALYZE, FORMAT JSON)
[your-query]

Quickstart

bun install
bun run app:dev

Vite will print the local URL after the dev server starts.

Handy Commands

• bun run app:dev start the app dev server
• bun run app:build typecheck + build the frontend
• bun run app:lint lint the frontend
• bun run app:fix format and fix the frontend