The ReliaDB EXPLAIN Analyzer is a free, browser-based tool that visualizes MySQL and MariaDB EXPLAIN output. Paste your query plan and get an interactive tree visualization, automatic performance issue detection with 49 rules, composite index recommendations, query rewrite suggestions, and index impact simulation. Supports MySQL EXPLAIN ANALYZE (tree format), MariaDB ANALYZE (table and JSON), and FORMAT=JSON output.
100% client-side — your data never leaves your browser. No backend, no API calls, no account required. Built by ReliaDB, a PostgreSQL and MySQL DBA consulting service.