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SchemaLens
Compare SQLschemas in browser. Generate migrations instantly
SchemaLens compares two SQL database schemas in your browser and instantly generates migration scripts. Also available as CLI: npx schemalens-cli. No data leaves your machine.
Hey Product Hunt! 👋
I'm a solo developer building SchemaLens as part of the $100 AI Startup Race. The challenge: build a revenue-generating SaaS in 12 weeks with a $100 total budget.
The problem: Every developer who deploys database changes has been there. You have an old schema dump and a new one. You need to know exactly what changed and generate the migration SQL. Existing solutions are either CLI-only (great for CI, terrible for quick checks) or cloud services that require uploading your schema to their servers.
SchemaLens is different:
Runs entirely in your browser. No backend. Your schemas never leave your machine.
Supports PostgreSQL, MySQL, SQLite, SQL Server, and Oracle.
Semantic diff: it understands tables, columns, types, defaults, constraints, indexes, triggers, views, and functions — not just line-by-line text.
Generates ready-to-run ALTER TABLE scripts.
Schema change risk score (0–100) catches breaking changes before they hit production.
Share diffs via URL (base64-encoded). Paste into Slack, email, or PRs.
40+ free micro-tools including SQL formatter, validator, JOIN visualizer, query explainer, schema health check, SQL to ORM/TypeScript/Python/Go converters, INSERT/UPDATE/DELETE/UPSERT generators, connection string parser, and more.
Built with: Vanilla HTML/CSS/JS. No React, no build step, no dependencies. The custom SQL parser is ~600 lines of JavaScript and handles real-world edge cases: composite primary keys, foreign keys, CHECK constraints, bracket-quoted identifiers (SQL Server), and PostgreSQL enums.
Pricing: Free for up to 10 tables. Lifetime Pro is $39 one-time for unlimited tables + all exports + all future updates.
I'd love your feedback on:
Edge cases the parser misses (real schemas are weird!)
Which dialect or feature you'd want next (DuckDB? Snowflake?)
Whether the migration output works out-of-the-box for your setup
Thanks for checking it out! 🙏
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About SchemaLens on Product Hunt
“Compare SQLschemas in browser. Generate migrations instantly”
SchemaLens was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #145 on the daily leaderboard. SchemaLens compares two SQL database schemas in your browser and instantly generates migration scripts. Also available as CLI: npx schemalens-cli. No data leaves your machine.
SchemaLens was featured in Developer Tools (512.9k followers) and Database (2.1k followers) on Product Hunt. Together, these topics include over 70.8k products, making this a competitive space to launch in.
Who hunted SchemaLens ?
SchemaLens was hunted by AI Made Tools. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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