Everything you need to know about Schemity.
General
Schemity is a local-first desktop application for database ERD (Entity Relationship Diagram) visualization and migration generation. It lets you design database schemas visually, reverse-engineer existing databases, and generate precise SQL migrations - all without sending your data to any cloud server. It is 9 MB, starts in seconds, and runs fully offline.
Schemity supports MySQL, MariaDB, PostgreSQL, SQL Server, and Supabase. PostgreSQL users also get multi-schema support - not just the public schema. You can connect through direct or SSH connections.
Schemity is available as a native desktop app on:
Schemity offers a 2-week free trial with all features unlocked, no credit card required. After the trial, the app is still usable - your work is never held hostage.
Schemity is also free for students and educators. Email [email protected] with your .edu address to request a free education license.
Features
Use the visual ERD designer to drag and drop entities onto the canvas, define fields, and connect them with relationships. The interface supports auto-resize, snap-to-guide alignment, and smart connection lines. For speed, use entity templates to reuse common field patterns across entities.
Yes. Schemity supports reverse engineering - connect to an existing MySQL, MariaDB, PostgreSQL, SQL Server, or Supabase database and the ERD diagram is generated automatically. This is useful for documenting legacy systems or onboarding to a new codebase.
Schemity compares your ERD design with the actual database state and generates the exact SQL needed to bring them in sync. It handles CREATE, ALTER, and DROP statements automatically. Every migration requires explicit confirmation before being applied, protecting you from accidental changes.
Schemity supports one-to-many and many-to-many relationships with automatic junction table generation. Relationship lines adapt and reroute automatically as you move entities on the canvas. You can also add custom waypoints for full manual control over line routing.
Schemity supports full constraint coverage including:
Yes. Schemity supports secure SSH tunneling for connecting to remote databases. Your database credentials are stored safely in your operating system's native keyring - never in plaintext files.
Schemity is built for keyboard-first use. Every action has a shortcut. It supports:
h j k l)Cmd+1 through Cmd+9Yes. Schemity supports multiple native tabs with isolated undo history per diagram. You can switch between them quickly using number-key navigation, making it easy to work across multiple schemas or projects in a single session.
Yes. Schemity has full temporal state management with undo/redo history. Each tab maintains its own isolated history, so undoing in one diagram never affects another.
Yes. You can assign custom colors to entities and their relationships for instant visual grouping and clearer diagram readability.
Yes. Your ERDs are plain JSON files stored locally. You can version-control them with Git, review schema changes in pull requests, and maintain a full history of every design decision. This is a core part of how Schemity is designed to be used.
Privacy & Data
No. Schemity is 100% offline. Your database schemas, designs, and all project data are stored locally on your machine and are never transmitted to any server.
Your workspace is stored as plain JSON files in a local folder on your machine. This means you have complete data ownership, no cloud dependency, and easy version control with Git. You can back up, move, or delete your data at any time.
Schemity does not collect any personal information. The only data it transmits is an auto-generated machine ID and your country code, both used solely for license verification. When you purchase a license, your payment and email are handled entirely by LemonSqueezy - Schemity does not store any of that information.
Yes. Schemity does not store your database credentials on any remote server. All connection details, including SSH credentials, remain on your local machine and are stored in your OS native keyring.
License & Pricing
Schemity is a one-time purchase of $129 with 1 year of updates included. After the first year, you can optionally renew updates for $69/year. Security patches are always free. The app works forever even without renewing - you just stop receiving new feature updates.
There is also a free 2-week trial with all features unlocked, and a free education license for students and educators.
Your work is never held hostage. After the trial expires, Schemity stops receiving updates but remains usable. You get a single friendly reminder when you open the app, once per session - not a popup that blocks your work. Your ERD files are plain JSON on your machine and are always yours.
License activation is handled through LemonSqueezy. After purchase, you will receive a license key via email. Enter that key along with your email address inside Schemity to activate it on your device.
The license is tied to your machine ID. Contact [email protected] for assistance with license transfers.
Yes. Schemity is free for students and educators with all features unlocked and 1 year of updates included. Email [email protected] with your .edu email address to request a free license.
Support
Use the GitHub feedback repository to report bugs and submit feature requests. You can also reach out on the Discord community.
Email us at [email protected] for any questions, licensing issues, or general inquiries.
Yes! Join the Schemity Discord server to connect with other users, share feedback, and get updates on new releases.
New versions are released periodically. Download the latest installer from the Platforms section of the website and install it over your existing version.