Why schema diff belongs in code review

💥 Breaking Changes

Dropped columns, removed tables, and type changes that break production are highlighted in red with a risk score. Never miss a breaking change again.

📊 Visual Diff

Side-by-side comparison with color-coded additions (green), removals (red), and modifications (yellow). Easier to read than raw SQL dumps.

📝 Migration Scripts

Generate ready-to-run ALTER TABLE scripts for PostgreSQL, MySQL, SQLite, SQL Server, and Oracle. Copy, paste, deploy.

🔗 Shareable Reports

Generate a shareable link to any diff. Post it in Slack, paste it in a PR description, or email it to your DBA for review.

⚡ Zero Setup

No npm install. No config files. No database connection. Paste two CREATE TABLE dumps and get instant results.

🔒 Privacy First

All parsing happens in your browser. Your schemas never touch our servers. Perfect for sensitive production schemas.

The 3-minute code review workflow

1

Dump your schemas

Run pg_dump --schema-only (or mysqldump --no-data) on both staging and production. Paste the outputs into SchemaLens.

2

Review the diff

SchemaLens highlights every table, column, index, and constraint change. Breaking changes get a red warning banner. Safe changes are green.

3

Copy the migration + share

Generate the ALTER TABLE script, export it as Markdown for your PR description, and share the diff link with your team for sign-off.

Try the Staging vs Production Example →

Automate it with the GitHub Action

For teams that want schema diff on every pull request without manual steps. The SchemaLens GitHub Action posts a risk-scored diff summary directly in your PR.

🔌 One-Click Install

Add the action to your workflow in 30 seconds. Works with any repository.

💬 PR Comments

Automatic risk-scored comments on every PR that touches schema files.

🚫 Block Breaking Changes

Optional: fail the build when breaking changes are detected.

Set Up GitHub Action → See PR Comment Demo

From the community

"Does it support diffing between branches (e.g., compare staging schema vs production)? That's the main use case I'd want — catching drift before a deploy, not after."

— Hacker News comment, May 2026

"I'd need it integrated into my CI pipeline, not just a manual tool. A GitHub Action that comments schema diffs on PRs would be more valuable."

— Product Hunt comment, May 2026

We built SchemaLens for exactly these workflows. Try the staging vs production example →

Catch schema mistakes
before they reach code review.