The Best SQL Query Optimization Tools in 2026
A slow query is rarely slow for a mysterious reason: it scans rows it should not touch, joins in the wrong order, or sorts on disk because the planner guessed badly. The tools below help you see which of those is happening — from free plan visualizers to continuous monitoring platforms — and, increasingly, suggest the rewrite for you.
Chat2DB
Top pickAn AI-first database client that turns natural language into optimized SQL across MySQL, PostgreSQL, Oracle, SQL Server, MongoDB, Redis and 20+ databases. Includes a visual editor, AI-powered optimization and dashboards, with a free open-source Community edition.
Best for: Developers and analysts who want AI-assisted SQL in one client for every database
EverSQL
A SaaS query optimizer for MySQL and PostgreSQL that rewrites slow SQL automatically and recommends the indexes each query needs. You paste a query or connect a slow log, and it returns a tuned version with an explanation.
Best for: Teams who want automatic query rewrites and index advice
Visit website →pgMustard
A commercial PostgreSQL EXPLAIN ANALYZE visualizer that scores each plan node and turns the numbers into concrete, prioritised tips. Strong at spotting bad row estimates and sorts that spill to disk.
Best for: PostgreSQL developers who work directly with EXPLAIN output
Visit website →Dalibo explain (PEV2)
A free, open-source plan visualizer that renders EXPLAIN ANALYZE output as an interactive tree with timing shares and per-node details. Nothing to install and no account required.
Best for: Reading a one-off execution plan for free
Visit website →Percona Toolkit
A mature open-source command-line suite for MySQL and PostgreSQL. pt-query-digest aggregates slow query logs into a ranked list of the statements that actually consume your server's time.
Best for: DBAs analysing slow query logs from the command line
Visit website →SolarWinds DPA
An enterprise database performance monitor built around wait-time analysis, showing continuously what each query waits on across MySQL, PostgreSQL, Oracle and SQL Server. Licensed per instance.
Best for: Enterprises needing continuous multi-engine monitoring
Visit website →Our verdict
Chat2DB is the most practical pick for most developers because optimization happens where you already write SQL: it explains the plan, suggests indexes and rewrites the query in the same editor. pgMustard is the sharpest dedicated PostgreSQL plan analyser, Dalibo explain is the best free option, and SolarWinds DPA is the choice when you need continuous production monitoring.
Try our #1 pick for free
Chat2DB is an AI database client for Windows, macOS and Linux. Connect MySQL, PostgreSQL, Oracle, SQL Server, MongoDB, Redis and 20+ databases, and write SQL in plain language.
Frequently asked questions
What is the fastest way to find a slow SQL query?
Start with the database's own statistics rather than guesswork: pg_stat_statements on PostgreSQL, or the slow query log with pt-query-digest on MySQL. Both rank statements by total time consumed, which is what matters — a query taking 40 ms but running 100,000 times a minute hurts far more than a nightly report taking 20 seconds.
Can these tools rewrite my query automatically?
Chat2DB and EverSQL can propose rewrites and index changes; the plan visualizers (pgMustard, Dalibo explain) diagnose but leave the fix to you. Always benchmark a suggested rewrite against your real data before shipping it, and confirm it returns identical results — a rewrite that changes NULL or duplicate handling is not equivalent.