Choosing a schema diff tool isn't just about features — it's about privacy, pricing, and how your team actually works. Here's the honest breakdown.
No account required. No data leaves your device.
How SchemaLens stacks up against Redgate SQL Compare and Prisma Migrate on the dimensions that matter most.
| Feature | SchemaLens | Redgate SQL Compare | Prisma Migrate |
|---|---|---|---|
| Pricing | Free tier + $12/mo Pro | ~$405/yr per user | Free (open source) |
| Runs in browser | ✅ Yes | ❌ Windows app | ❌ CLI only |
| Data privacy | ✅ 100% client-side | ⚠️ Local app | ⚠️ Schema introspection |
| PostgreSQL support | ✅ Full | ✅ Full | ✅ Full |
| MySQL support | ✅ Full | ✅ Full | ✅ Full |
| SQL Server support | ✅ Full | ✅ Full | ❌ No |
| SQLite support | ✅ Full | ⚠️ Limited | ✅ Full |
| Oracle support | ✅ Full | ✅ Full | ❌ No |
| Migration generation | ✅ ALTER TABLE DDL | ✅ ALTER TABLE DDL | ✅ Prisma migrations |
| CI/CD integration | ✅ CLI + GitHub Actions + GitLab + Bitbucket | ⚠️ PowerShell / CLI | ✅ Native CLI |
| Breaking change detection | ✅ Built-in heuristic | ❌ No | ❌ No |
| REST API | ✅ Free | ❌ No | ❌ No |
| Export formats | SQL, Markdown, PDF, JSON | SQL, HTML report | SQL only |
| No install required | ✅ Yes | ❌ Installer + license key | ❌ npm install + Node.js |
| Open source | ❌ No | ❌ No | ✅ Yes |
SchemaLens runs entirely in your browser. Your schema never touches a server — ideal for HIPAA, SOX, and air-gapped environments.
Redgate is a local Windows app, so data stays on your machine. But it requires installation and license activation.
Prisma Migrate introspects your database over the network. While Prisma is trustworthy, some compliance teams prohibit any external tool touching production schemas.
SchemaLens is free for up to 10 tables. Pro is $12/month or $99/year — no per-user pricing, so teams scale affordably.
Redgate starts around $405/year per user. For a 5-person team, that's over $2,000/year. Powerful, but expensive for small teams.
Prisma Migrate is free and open source. But it requires Prisma as your ORM — switching costs can be high if you're using Drizzle, TypeORM, or raw SQL.
SchemaLens works instantly: open the URL, paste two SQL dumps, click Compare. No install, no signup, no database connection strings.
Redgate requires a Windows machine, installation, and license activation. Great for DBAs, but slow for developers who need a quick diff.
Prisma Migrate requires a Node.js project, Prisma schema, and CLI commands. It's seamless if you already use Prisma, but overkill for one-off diffs.
SchemaLens supports PostgreSQL, MySQL, SQLite, and SQL Server from a single interface. Perfect for polyglot teams and consultants.
Redgate supports the widest range — including Oracle — but each dialect is a separate product or license tier.
Prisma Migrate supports PostgreSQL, MySQL, SQLite, SQL Server, CockroachDB, and MongoDB — but only through the Prisma Client ecosystem.
SchemaLens provides a zero-dependency CLI, GitHub Actions, GitLab CI, and Bitbucket Pipelines templates. Plus a free REST API.
Redgate offers a command-line interface and PowerShell modules, but requires licensed agents on build servers.
Prisma Migrate integrates naturally with Node.js CI pipelines. Great for Prisma shops, but not a general-purpose schema diff tool.
SchemaLens detects 6 types of dangerous changes: dropped tables/columns, type narrowing, NOT NULL without defaults, missing FK indexes, and dropped constraints.
Redgate shows the diff comprehensively but doesn't flag which changes are dangerous. You must review manually.
Prisma Migrate generates safe migrations by default but won't warn you about risky changes in an external schema dump.
Yes. SchemaLens is free for schemas up to 10 tables. You get the full visual diff, migration preview, and export to Markdown. Pro unlocks unlimited tables, full migration SQL generation, PDF export, and shareable public links for $12/month.
Absolutely. SchemaLens complements Prisma Migrate perfectly. Use Prisma for day-to-day migrations, and SchemaLens when you need to compare a legacy database dump, review a teammate's SQL migration, or generate ALTER TABLE scripts for a database that isn't managed by Prisma.
Redgate SQL Compare is the industry standard for SQL Server teams and large enterprises. If you need Oracle support, data comparison, or deep Microsoft ecosystem integration, it's worth the investment. For smaller teams or occasional diffs, SchemaLens offers 90% of the value at 3% of the cost.
SchemaLens currently diffs tables, columns, indexes, constraints, triggers, views, and enum types. Stored procedure and function diffing is on the roadmap. For teams that need this today, Redgate is the better choice.
Yes. SchemaLens provides a zero-dependency CLI, pre-built GitHub Actions / GitLab CI / Bitbucket Pipelines templates, and a REST API. You can diff schemas in pull requests and fail the build on breaking changes.
Paste two CREATE TABLE dumps and see the diff instantly. No signup, no install, no credit card.
Compare Schemas FreeFree for up to 10 tables. Pro starts at $12/mo.