Schemity turns complex schemas into understandable systems. Break a 50-table database into focused Context Views - one source of truth, many perspectives. Your schema never leaves your machine. No cloud dependency, no subscription, no procurement cycle.
No credit card required. 2-week full trial.
PostgreSQL
Supabase
MySQL
MariaDB
SQL Server
Most ERD tools force one giant diagram and hope you can read it. Schemity lets you keep a single source of truth, then project it into Context Views - auth, billing, analytics, whatever lens you need. Your client's schema never touches a third-party server. Works on locked-down corporate laptops. Document production schemas in minutes, not weeks.
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 - never on a third-party server. Safe for NDA-covered client work, compliant by default. Commit it, review it in PRs, let your team pull it.
Your main diagram is the single source of truth. Context Views are read-only projections for each concern - auth, billing, analytics. Ready for audits, onboarding, or handovers without rebuilding from scratch.
Reverse-engineer a live database into a visual ERD, then generate the exact SQL diff as you evolve the design. Turn weeks of audit preparation and handover documentation into minutes.
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. No data ever touches a third-party server. Safe for
compliance-sensitive and NDA-covered projects.
Small installer file. No Electron, no JVM, no IT ticket needed. Works offline, behind VPN, air-gapped - runs anywhere your team does. macOS, Windows, and Linux.
Connect to MySQL, MariaDB, PostgreSQL, SQL Server, or Supabase through direct or SSH connections - or work in ERD-only mode when you just need to think through the schema.
Load a local SQL file or paste CREATE TABLE statements and Schemity builds the full ERD - entities, fields, and relationships - automatically. No database connection required. Go from SQL to visual diagram in seconds.
Ask AI to create entities, define relationships, add or edit fields, and import entities into Context Views - all from a chat interface. BYOK (Bring Your Own Key) - your data flows directly to your AI provider with no intermediate server, no data stored or processed by us. Supports Claude, OpenAI, Google Gemini, DeepSeek, and Grok.
Tabs for systems, schemas for structure, Context Views for use cases. Three layers of organization that mirror how engineers actually think about complex databases - not one flat canvas.
Smart defaults, drag-and-drop relationships, and a visual editor that gets out of your way - so your team spends time understanding the schema, not fighting 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.
Full check constraint support - write any expression you need. For IN constraints, Schemity extracts the allowed values into a selectable dropdown for default values - self-documenting and enforceable in one step.
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.
Use tabs to separate the systems you work on - one product, one tab. Quick number-key navigation keeps you focused as you move between domains.
Model across PostgreSQL schemas - not just the public schema. Use them to express domains and structural boundaries inside a single database.
Load a local SQL file or paste CREATE TABLE statements. Schemity builds entities, fields, and relationships automatically - no database connection needed.
Full ERD control from chat - create entities, define relationships, create, edit, or delete fields, and import entities into Context Views. BYOK - your data goes directly to your AI provider, never through our servers.
A complete breakdown of what Schemity can do for you, by category.
Connect your database, break it into focused Context Views, and evolve the schema with confidence - all from a single source of truth.
Reverse-engineer a live database in seconds, import SQL to build an ERD instantly, or start from scratch. Get a complete visual picture of your schema - no weeks of manual documentation. Everything stays on your machine.
Reduce 50 tables down to a 10-table focused view. Create one Context View per concern - auth, billing, analytics - ready for audits, handovers, or onboarding new team members.
Schemity diffs your ERD against the live database and generates the exact SQL migration. Your ERD lives as plain JSON in your repo - no third-party server ever sees your schema.
Ready to download. No IT ticket. Running in seconds on any corporate laptop.
Download Free TrialYour client's schema never touches a third-party server. What we don't store, we don't have to protect - and you don't have to audit.
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.
One-time purchase of $129. No procurement review, no annual renewal cycle, no per-seat negotiation. Start with a free 2-week trial.
Experience seamless performance and native feel across all major operating systems.
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Small installer file. Runs on locked-down laptops, behind VPNs, air-gapped. Document your production schema in minutes, not weeks. Your diagrams live as JSON in your repo - no third-party server ever sees your data.