Aiven’s standalone SQL Query Optimizer is completely free with no account required, democratizing basic SQL optimization. Supports PostgreSQL (versions 7-18), MySQL, Amazon Aurora, and MariaDB. Available through multiple interfaces: web application at aiven.io, VS Code extension, and JetBrains IDE plugins (IntelliJ, DataGrip, PyCharm). The optimizer analyzes query syntax and provides rewrite suggestions, missing index recommendations, and execution plan interpretation. While less sophisticated than full platforms like EverSQL (Aiven’s premium offering), it provides valuable optimization for individual developers without budget for paid tools. The tool focuses on common optimization patterns: JOIN ordering, subquery transformation, unnecessary DISTINCT removal, and index-friendly rewrites. No query history or monitoring—purely ad-hoc optimization. Page should cover: supported PostgreSQL version specifics, VS Code extension setup, JetBrains plugin installation, optimization patterns covered, limitations compared to EverSQL, and use cases for individual developers and students.