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Schemity

Native desktop ERD tool for offline database schema design

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What is Schemity?

Schemity is a native desktop ERD tool built for software engineers who need to design, document, and manage database schemas without relying on cloud services. It works offline, stores everything in local JSON files, and requires no account. One-time purchase, no subscription.

With Schemity, you can break down complex schemas into focused Context Views, drag-and-drop relationships, and leverage smart features like auto junction tables, check constraint documentation, and custom entity colors. Import SQL files to instantly generate visual ERDs, or use the AI assistant (BYOK) for private, cloud-free schema creation.

All changes are saved locally and can be version-controlled via Git. The tool runs on macOS, Windows, and Linux, and works on locked-down corporate laptops behind VPNs or air-gapped networks.

How to use Schemity

  1. 1

    Download and install Schemity on macOS, Windows, or Linux.

  2. 2

    Create a new ERD or import SQL to generate entities automatically.

  3. 3

    Drag fields between entities to define relationships (1:1, 1:N, N:N).

  4. 4

    Organize views with Context Views to focus on specific parts of the schema.

  5. 5

    Review and export migration SQL diffs for safe database changes.

Key features

Break complex schemas into focused Context Views for different perspectives.

Create relationships (1:1, 1:N, N:N) with drag-and-drop and auto junction tables.

Git-native JSON storage keeps schemas in your repo, never on a third-party server.

Import SQL files or dump to instantly generate a visual ERD.

AI assistant with BYOK support for private, offline AI-driven schema design.

Use cases

  • Design database schemas offline for NDA or air-gapped projects.
  • Reverse engineer production databases for documentation.
  • Rapid prototyping of new system architecture.
  • Audit and handover documentation preparation.
  • Team collaboration via Git without cloud dependency.

Best for

Software engineersDatabase architectsIndie developersTeams behind VPNs or air-gappedCompliance-sensitive projects

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Frequently asked questions about Schemity

Common questions to help you decide if Schemity is right for you.

Schemity offers a free forever plan for education and a 2-week full free trial. One-time purchase, no subscription.

No, Schemity works fully offline. Your schema data never leaves your machine.

Schemity supports PostgreSQL, Supabase, MySQL, MariaDB, SQL Server. Connect via direct or SSH, or work in ERD-only mode.

Schemas are saved as plain JSON files in ~/schemity/, ready to be committed to Git for collaboration and history.

Yes, BYOK AI assistant supports Claude, OpenAI, Gemini, DeepSeek, Grok. Data goes directly to your AI provider, no intermediate server.

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