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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! 🙏
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.
On the analytics side, SchemaLens competes within Developer Tools and Database — topics that collectively have 515k followers on Product Hunt. The dashboard above tracks how SchemaLens performed against the three products that launched closest to it on the same day.
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.
For a complete overview of SchemaLens including community comment highlights and product details, visit the product overview.
AI Made Tools