SchemaLens is built for engineering teams who review production schemas. We treat your SQL like the sensitive asset it is: parsed in your browser, never uploaded to our servers, and never logged.
Most schema diff tools ask you to upload DDL, connect a database, or run a cloud service. SchemaLens does the opposite: the entire diff engine runs in your browser.
Your CREATE TABLE statements are parsed by our open-source JavaScript engine inside your browser tab. They are never sent to SchemaLens servers.
We do not ask for database credentials or network access to your Postgres, MySQL, or SQL Server instances. Paste dumps, run diffs, done.
Saved diffs and history live in your browser's localStorage. Clear it anytime from your browser settings. No cloud account required for the free tier.
We do not use third-party analytics cookies. Optional, privacy-friendly analytics events are sent only for product improvement and are not tied to personal identity.
The diff engine and many micro-tools are released under the MIT license. Inspect the code, fork it, or self-host if your organization requires it.
Every page and API endpoint is served over TLS. We use Vercel's edge network for static hosting and serverless functions.
SchemaLens is published on the platforms developers already trust. Click any badge to verify our listing.
SchemaLens is designed for teams who cannot upload production DDL to third-party servers.
| Feature | SchemaLens | Cloud schema diff tools |
|---|---|---|
| Browser-side SQL parsing | ✓ | ✗ |
| No account required for free tier | ✓ | ✗ |
| No database credentials collected | ✓ | ✗ |
| Open-source core | ✓ | ✗ |
| CI/CD integrations | ✓ | Sometimes |
| Team workspace & alerts | Team plan | Enterprise plans |
We believe schema diff tooling should be inspectable. Our engine is MIT-licensed and available on GitHub.
The core diff engine and many utilities are released under the MIT License. You can use, modify, and distribute them freely.
We offer free Pro access for open-source maintainers and students. See Open Source Sponsorship and Student License.
Not satisfied with Pro or Team? Contact us within 30 days for a full refund, no questions asked.
See our real metrics, progress, and setbacks on the Open Startup page.
Our free web diff and many micro-tools run entirely in your browser. The server only serves static HTML, CSS, and JS.
Features that require a server (GitHub PR diff viewer, CI/CD webhooks, badge API) run as stateless Vercel serverless functions. They do not persist your schema data.
Every significant change is tracked in our changelog. We publish security-relevant fixes promptly.
Found a security issue? Email us at security@schemalens.tech or open a private GitHub security advisory.
Try the free web diff, add SchemaLens to your CI/CD pipeline, or request a Team invoice for your organization.