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Schema Diff

Paste two CREATE TABLE dumps. Compare. Migrate.

⚑ CLI: npx schemalens-cli diff old.sql new.sql Docs β†’
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Schema A (Old)
Schema B (New)
πŸ’‘ Free tier: visual diff + migration preview for up to 15 tables. Pro: unlimited tables, full migration SQL, Markdown & PDF export, and shareable diff links. New: Try Pro free for 24 hours β€” no email required. Upgrade β†’

Compare database schemas in seconds

Paste two CREATE TABLE dumps, click Compare, and get a visual diff plus ready-to-run migration SQL.

βœ“ PostgreSQL βœ“ MySQL / MariaDB βœ“ SQLite βœ“ SQL Server βœ“ Oracle
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Visual Diff

See exactly what changed β€” added, removed, and modified tables at a glance.

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Migration SQL

Generate ALTER TABLE scripts for PostgreSQL, MySQL, SQLite, SQL Server, and Oracle.

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Breaking Changes

Spot dangerous drops and renames before they break production.

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Privacy-First

Custom parser runs entirely in your browser. Your schemas never touch our servers. How it works

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Speed Challenge β€” Think you can spot schema changes faster than SchemaLens?

Race the clock across 3 rounds of real-world diffs. Compare your score to other developers and share your rank. Start Challenge β†’

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Join thousands of developers who diff schemas before every deploy.

Browse 6 real-world examples β†’ Β· How it works β†’ Β· Export from your GUI tool β†’ Β· Bookmarklet for instant diffs β†’ Β· Generate PDF report β†’ Β· Speed Challenge β†’ Β· Diff Git branches β†’ Β· 1-Click Diff β†’ Β· Need manager approval? β†’ Β· Not sure where to start? β†’