Overview of the user interface

This page describes the user interface of Luna Modeler, a database design tool for relational databases.

  1. Projects
  2. Connections
  3. Panels
  4. Settings & Themes
  5. Display modes & Diagram options
  6. Line modes – Basic or Detailed

1. Projects

Saved projects are displayed on the Projects page. From this window, you can create new projects, open projects from a file or from a URL, import SQLite database structures from files and more. You can also easily search the list of projects.

list of project

Tip: Details of the active project are shown in the footer.

2. Connections

A list of all defined database connections is available on the Connections page. Here you can create new connections, duplicate or edit connections, and run reverse engineering to visualize the existing database structure.

list of connections

3. Panels

The user interface contains two side panels. On the left is the list of objects, on the right, you can edit the properties of the project, diagram or selected object.

Luna Modeler user interface

4. Settings & Themes

On the Settings page you can change the theme to Dark or Light, set the number of UNDO steps, where to display tabs with diagrams and other options.

application settings

5. Display modes & Diagram options

By default, main objects, e.g. tables and columns (PostgreSQL, MariaDB…) with datatypes are displayed, however you can also display descriptions, indexes, schema etc. To change the visualization, click the Display button and select the desired option.

Toolbar - Display drop down button

You can also click the diagram area and set the settings in the side panel.

Diagram options in Luna Modeler - side panel

Display descriptions

Descriptions can be displayed below tables. The following screenshot show a visualization with table columns, indexes and descriptions. Column data types are hidden as well as schema name and information about estimated sizes.

ER Diagram made with Luna Modeler. Indexes and descriptions are visible, column data types are hidden.

Display schema/database in diagram

In projects for relational databases where either schema or database can be defined, the schema can be displayed before the object name.

Display estimated sizes

You can also enable displaying of estimated sizes in the entity-relationship-diagram.

Estimated size

Display cardinality captions

It can be useful to view additional information near reference/relationship lines. Whether it is simple information indicating the maximum number of records, or information containing advanced quantification – the minimum number, the most likely number and the maximum number of records. You can also specify just the max number of records and keep the visualization simple.

Enable the Display cardinality captions option to see the captions in your ERD.

cardinality captions

6. Line modes

In Luna Modeler it is possible to switch between two modes of line drawing. Simple and Detailed.


In Detailed mode, the line is drawn from column to column.

line modes - detailed


In Simple mode, the line is drawn from the center of the table to the center of the other table (or another object).

line mode - simple


Quick links

Download Buy Now!

Blog Categories
Blog by Platforms