We prepared a small list of reasons why you'll love Pratva.

Feature Free Pro
Table limit 20 tables Unlimited
Project limit 1 project Unlimited
Diagram version limit 3 versions Unlimited
Before and after create table scripts
Triggers on tables
Foreign Keys
Multiple diagram views
Logical and physical diagrams
Schema support
Tablespaces and/or Table storage partitions
Create functions, procedures and views
Generate Create and Alter SQL Scripts for MS SQL Server
Generate Create and Alter SQL Scripts for MySQL
View-only Diagram sharing
Diagram sharing with edit permissions *
Concurrent diagram editing
Team users license management
Multiple Teams creation and management

* Both users need a Pro license in order to be able to edit the shared diagram.