Luna Modeler
Professional Data Modeling Tool
for relational databases

FREE 14 days trial. No card required.

More than just static ER diagrams Start data modeling from scratch or reverse-engineer databases
Stop schema drift Compare dev, staging & production and generate synchronisation SQL
Works fully offline Your schemas stay on your device, nothing uploaded to the cloud, ever
One-time purchase Pay once, use forever.
No subscription, no lock-in

Screenshot of Luna Modeler showing an ER diagram and database design canvas — Screenshot of Luna Modeler used as a database design tool, showing an entity relationship diagram canvas with tables, relationships, and properties panel.

A Cross-Platform Desktop Tool
for Visual Database Design

Luna Modeler helps you design databases visually. Draw data models with ER diagrams, generate SQL scripts, connect to existing databases to understand how they are built, and share clear documentation with your team. Everything stays on your computer — no cloud required.

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Why professionals
choose Luna Modeler

Works with on-premise and cloud databases (Azure, AWS, Supabase)
Lightweight, cost-effective, and secure option
ERD + sub diagrams + graphics for data flow & data lineage diagrams
Schema comparison & synchronisation SQL scripts
SSH / SSL / TLS tunnel support (Professional edition)

When you're designing a new system

Draw data models offline. No database required. Run forward engineering to turn your visual data model into deployment-ready DDL. Platform specific syntax, validated output.

When you inherit a database

Connect to a live database and reverse engineer it into a complete ER diagram automatically. Understand the database in minutes. Create sub-diagrams, add notes, flowcharts or even custom fields.

When you need to change schema safely

Compare your data model against any connected database, see every diff highlighted, and generate a targeted synchronisation SQL script. Keep your environments in sync.

When documentation is always outdated

Keep your team aligned - generate interactive HTML documentation from your data model. When the schema changes, regenerate in one click — no doc maintenance, no stale wikis.

SQL script generated from an ER diagram in Luna Modeler database design tool — Screenshot of Luna Modeler generating SQL DDL scripts from an ER diagram, with platform-specific syntax for the connected database.

Platform-Specific SQL for Every Database in Your Stack

Luna Modeler doesn't generate generic SQL that breaks at deployment. Every forward-engineered script matches your database's exact dialect.

PostgreSQL — PostGIS types, Supabase, AWS RDS for PostgreSQL
Oracle Database — on-premise, AWS RDS Oracle, Oracle Cloud
SQL Server — Azure SQL Database, Entra ID auth
MySQL and MariaDB — open-source stacks
SQLite — embedded, file-based, and mobile application databases

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Your Schemas Never Leave Your Machine

Luna Modeler is a desktop application. Your database credentials, ER diagrams, schema files, and generated SQL are stored on your own device only. No account required to use it. No schemas uploaded to our servers.

Your intellectual property stays in your hands.

Download free trial — no account needed