Engineering managers use SchemaLens to audit their team's database schemas for hidden risks: missing primary keys, unindexed foreign keys, reserved word collisions, and schema drift between staging and production. Paste your SQL. Get a score. Fix the issues.
Supports PostgreSQL, MySQL, SQLite, SQL Server, and Oracle. No data leaves your browser.
The most common schema issues that slip into production — and the ones that wake you up at 3 AM.
Tables without primary keys can't be reliably updated, replicated, or referenced. ORMs behave unpredictably. Replication breaks. This is the #1 schema health issue we find in production audits.
Foreign keys without indexes cause full table scans on every DELETE or UPDATE of the parent table. In large tables, this turns a millisecond query into a minutes-long lock.
Tables without created_at or updated_at make debugging impossible. When a bug report comes in, you can't trace when the data changed. Compliance audits fail.
Column names like order, user, or group work fine in development — then break in production when a dialect upgrade changes behavior. We check 450+ reserved words across 5 dialects.
Mixing snake_case and camelCase, inconsistent pluralization, or missing table prefixes makes schemas harder to maintain and increases onboarding time for new developers.
Staging and production schemas diverge over time. New indexes added to staging never make it to prod. Columns altered in one environment cause queries to fail in another.
Copy your CREATE TABLE statements from any environment — pg_dump, mysqldump, or your ORM's migration file. Paste them into the SchemaLens health checker.
SchemaLens runs 20+ lint checks and gives you a 0-100 health score per table. Critical issues are flagged in red. Warnings in yellow. Passes in green.
Export the audit as Markdown or share a link with your team. For teams, SchemaLens Pro adds Slack alerts when a shared diff contains breaking changes.
Apply the fixes, paste the updated schema, and watch your score improve. Make it part of your code review process — or automate it with the GitHub Action.
SchemaLens is already used by teams who need to move fast without breaking databases.
Every table gets a 0-100 score based on 20+ lint rules. See which tables need attention first. Track score improvements over time as your team fixes issues.
PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, and Oracle. Each dialect gets tailored checks — from PostgreSQL-specific reserved words to Oracle's 30-character name limit.
Compare schemas between environments and get a 0-100 risk score. Dropped columns, type narrowing, and missing indexes are flagged before they reach production.
SchemaLens Team lets you save diffs to the cloud and share them with a link. No more pasting SQL into Slack DMs. Your whole team sees the same diff, always up to date.
Get notified in Slack when a shared diff contains breaking changes. Route alerts to #engineering, #dba, or #deployments based on severity.
Your schema structures never leave the browser in the free tier. For teams with compliance requirements, SchemaLens Pro keeps data encrypted in transit and at rest.
It takes 30 seconds to paste your schema and get a health score. No signup. No credit card. No data leaves your browser.