✅ 100% free web diff 🔒 Schemas stay in your browser ⚡ CI/CD ready

Stop shipping breaking schema changes

SchemaLens compares SQL schemas instantly, generates migration scripts, and scores every change for risk — so dangerous migrations never reach production.

Try the free schema diff → Add GitHub Action — Free

No signup. No database connection. Supports PostgreSQL, MySQL, SQLite, SQL Server, and Oracle.

Built for database teams who review migrations in PRs

The cheapest place to catch a bad migration is before it merges.

🔍

Semantic schema diff

Not a text diff. SchemaLens understands tables, columns, indexes, constraints, and types — and tells you exactly what changed.

🚨

Breaking-change detection

Dropped columns, NOT NULL without defaults, narrowed types, and missing FK indexes are flagged automatically with a 0–100 risk score.

🛠️

Migration SQL generated

Get ready-to-run ALTER TABLE scripts in your dialect. Rollback scripts included. Copy, review, commit.

🐙

GitHub Action (free)

Add schema diff checks to every pull request. PR comments, Check Runs, and smart skip when no .sql files changed.

🔒

Privacy-first

The web diff runs entirely in your browser. Your schema text never touches our servers unless you explicitly use the CI API.

🦊

All major CI platforms

GitHub Actions, GitLab CI, Bitbucket Pipelines, Jenkins, CircleCI, and Azure DevOps — with a 60-second setup wizard.

Add schema diff to your CI/CD pipeline in 60 seconds

Paste a public GitHub repo URL and the SchemaLens CI/CD Setup Wizard auto-detects your SQL files, guesses your dialect, and generates a ready-to-commit config.

⚡ Open CI/CD Setup Wizard 🚀 All platforms in 60s
✅ No license key required ✅ No database connection ✅ No credit card

Frequently asked questions

Quick answers for database teams evaluating schema diff tools.

Is the web diff really free?

Yes. Paste any two CREATE TABLE dumps and get the full visual diff, migration SQL, and rollback script. No signup, no table limit, no credit card.

Do I need to connect a live database?

No. SchemaLens works with SQL text — pg_dump output, migration files, or hand-written CREATE TABLE statements. Your data never leaves your device in the browser tool.

Which SQL dialects are supported?

PostgreSQL, MySQL/MariaDB, SQLite, SQL Server, and Oracle.

What does the GitHub Action cost?

Nothing. The SchemaLens GitHub Action is free for every repo, including PR comments, Check Runs, breaking-change detection, and full migration SQL.

What is the Team plan for?

Team adds shared workspaces, diff versioning, Slack/Teams drift alerts, org-wide billing, and admin controls. See Team features →

Try it on your schema right now

Paste two CREATE TABLE dumps and see the diff in under 10 seconds. Then add the free GitHub Action to keep every future migration safe.

Try the free schema diff → Add GitHub Action