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Grade any SQL query in seconds.

Paste a query, get a letter grade and concrete fixes. Free, no signup required.

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How QueryGrade works

Every grade is the product of deterministic rules and a model that keeps learning from real engineers like you.

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Rule-based grading

Nine specialized analyzers (SELECT, JOIN, WHERE, indexing, subqueries, ORDER BY, GROUP BY, plus MySQL- and PostgreSQL-specific patterns) detect 18+ issue types and emit 27+ recommendation types. Output is a letter grade A–F with a 0–100 score.

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ML-powered refinement

A hybrid model trained on curated query corpora and user feedback weights the rule-based score. When the model is confident, its prediction nudges the final grade so it reflects how queries actually perform — not just how strict our rules are.

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You make it smarter

Every thumbs-up / thumbs-down on an analysis becomes training data. Periodic retraining means today's grades reflect what real engineers found helpful yesterday.

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