When comparing Schemaball vs SQLGate, the Slant community recommends SQLGate for most people. In the question“What are the best database design programs?” SQLGate is ranked 2nd while Schemaball is ranked 15th. The most important reason people chose SQLGate is:
Functions; filter, sort and group on grid / Copy, past, sum and statistics functions like excel.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Supports reading schemas from multiple sources
Schemaball can read schemas from multiple sources such as SQL schema dumps, flat files or live databases.

Pro Interesting twist on visual interface
Gives a quick way to grasp an overview on the past/present complexity of the database (or group of tables) undergoing inspection.
Pro Quick data analysis
Functions; filter, sort and group on grid / Copy, past, sum and statistics functions like excel.
Pro Saves time with autocomplete & template functions
Pro Fast processing and easy customization
They put out weekly updates, so there are new and impressive functions being added pretty consistently.
Pro Supports cloud-based DB such as AWS & Azure
Pro Includes PL/SQL editor and debugger
Pro ER diagrams
Entity Relationship database diagrams limitations are: only supports reverse engineering, and can not export to formats other than .erd
Cons
Con Visualizations may be hard to get used to
Since schemas are visualized by using stylized "schema balls" it may be hard getting used to them since they are so different from the other, more straightforward options.
Con Logon
The logon process after starting up the application is rather long winded (tested with PostgreSQL, no defaults shown for e.g. port number).
Con Free version is limited
e.g. only 10 tables allowed in ERD designer.
