Design your data model visually, create relationships by drag and drop, and generate SQL migrations - in a 9 MB native app that works offline. No DBA knowledge required.
MySQL
PostgreSQL
SQL Server
Opinionated defaults, drag-and-drop relationships, Git-native workflow, and live database sync. All in a lightweight native app.
Create foreign keys by dragging fields between entities - 1:N, 1:1, or N:N with auto-generated junction tables. Color-coded connection lines and smart routing keep complex diagrams readable.
Your ERD lives as a JSON file in your repo. Commit it, review it in PRs, let your team pull it. No cloud account, no shared workspace to manage.
Opinionated defaults - snake_case, auto FK naming, auto junction table. Vim-style shortcuts, multiple tabs, copy/paste between diagrams, and undo/redo make it feel like a code editor, not a drawing tool.
Compares your ERD to the live database and generates the exact SQL diff. Reverse-engineer an existing database into an ERD, evolve the design, then apply migrations directly.
Unique constraints, check constraints, indexes, and not-null rules are part of your visual design - not afterthoughts buried in migration files. Smart color indicators make multi-column constraints immediately visible.
Plain JSON files in ~/schemity/ - readable, backupable,
portable. You own your data completely. No cloud dependency.
Built with Native WebView and Rust. Fast to download, instant to launch. Works offline, behind VPN, air-gapped. macOS, Windows, and Linux.
Connect to MySQL, PostgreSQL, or SQL Server through direct or SSH connections - or work in ERD-only mode when you just need to think through the schema.
Switch between dark and light themes to match your preference and reduce eye strain during long design sessions.
Smart defaults, drag-and-drop relationships, and a visual editor built for engineers - so you can focus on your data model, not the tool.
Sketch your schema in seconds. Go from concept to concrete entities before the idea fades.
Create 1:N, 1:1, or N:N relationships with simple drag-and-drop. Auto-generated junction tables, auto FK naming - no manual wiring needed.
Arrange your diagram the way you think about it, not the way the layout forces you. Lines adapt and reroute automatically. Add custom waypoints for full control.
Encode business rules as constraints. They become both enforceable logic and living documentation - referenceable directly in default values.
Group related entities visually. Color-code entity groups and their relationship lines for instant clarity on large diagrams.
Instantly distinguish between single-field unique constraints and composite unique together groups at a glance.
Every schema change requires explicit migration confirmation - no accidental alterations to your database. Review the exact SQL diff before applying.
Work across multiple tabs simultaneously with quick number-key navigation to stay focused and organized.
Model across PostgreSQL schemas - not just the public schema. Reflect your actual database structure in the ERD.
Design your schema visually, sync with your live database, generate the SQL diff, and commit alongside your code.
Create entities and relationships visually with drag and drop. Opinionated defaults handle snake_case naming, auto FK, and junction tables. Start from scratch or reverse-engineer a live database.
Schemity compares your ERD to the live database and generates the exact SQL migration to close the gap - nothing more, nothing less.
Your ERD lives as plain JSON files alongside your code. Commit, push, and let teammates pull - Git handles the rest.
Schemity is designed to collect as little as possible. What we don't store, we don't have to protect.
We only store an auto-generated device ID and your country - for license management and regional support. No name, no email, no usage tracking. Nothing that identifies you.
All payment processing and billing are managed by LemonSqueezy. Schemity never sees or stores your payment information.
Because Schemity stores almost nothing, it largely satisfies SOC 2 and ISO 27001 requirements by design. Your ERD files live locally in your repo - not on our servers.
Start for free, upgrade when you're ready. No subscription required.
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Visual database design with drag-and-drop relationships, Git-native workflow, and SQL migration generation. Built for every engineer who touches a database. Download Schemity and get started in seconds.