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sqldef review

Free#2 of 24 in Database Schema Comparison Tools

A free, open-source CLI for declarative, repeatable database schema migrations.

9.2/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

sqldef is an open-source command-line tool for declarative database schema management. Developers define a desired schema in plain SQL, then compare it with a current database or another SQL schema file. sqldef can generate and apply migrations, export existing schemas, preview generated DDL changes, and safely rerun idempotent operations. It is suited to development teams managing schema changes across MySQL, MariaDB, TiDB, PostgreSQL, SQLite3, and SQL Server.

There is no paid tier in the published model: sqldef is free and open source. It runs on Windows, macOS, and Linux, making it practical for cross-platform development and automation workflows. Its ecosystem connection is focused rather than broad, with a GitHub Actions preview workflow for pull requests. Database-specific commands support MySQL, PostgreSQL, SQLite3, and SQL Server, while offline comparison of two SQL files supports CI/CD checks without connecting directly to a database.

The standout capability is the declarative migration workflow. sqldef compares the desired SQL definition with the current state, generates the required changes, and can show those changes before application. Rename support covers tables, columns, indexes, and enum values, while idempotent operations help make repeated migration runs predictable. Teams wanting plain-SQL, multi-engine schema automation should consider sqldef; teams requiring a graphical schema editor or broader named integrations should look elsewhere.

sqldef pros and cons

  • Where it wins
    • Supports MySQL, PostgreSQL, SQLite3, and SQL Server
    • Generates dry-run previews and idempotent migrations
    • Works with GitHub Actions pull-request previews
  • Where it doesn't
    • The workflow is centered on a command-line tool
    • Rename support covers selected tables, columns, indexes, and enum values
    • Database-specific commands are used for different engines

sqldef fact sheet, pricing and score →

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