See it in action
Paste two schemas. Click Compare. Get the diff and migration SQL in seconds.
SchemaLens is a privacy-first schema diff tool for PostgreSQL, MySQL, SQLite, SQL Server, and Oracle. Paste two CREATE TABLE dumps, get a visual semantic diff, and generate ready-to-run ALTER TABLE scripts.
100% client-side. Your schemas never leave your browser.
Paste two schemas. Click Compare. Get the diff and migration SQL in seconds.
100% client-side. Your schema never hits a server. Verify it yourself in DevTools → Network.
Open the URL and diff in 10 seconds. No install, no signup, no backend.
Understands tables, columns, types, defaults, constraints, indexes, triggers, views — not just text.
Risk score (0–100) flags dangerous migrations before they hit production.
Share diffs via base64-encoded URLs. Paste into Slack, email, or PR descriptions.
Run npx schemalens-cli locally or in GitHub Actions, GitLab CI, and Bitbucket Pipelines.
18 days. 40 blog posts. 17 micro-tools. One developer. One mission.
No signup required. No data leaves your browser.
