When comparing SchemaSpy vs SQL Power Architect, the Slant community recommends SQL Power Architect for most people. In the question“What are the best relational database design and modelling tools?” SQL Power Architect is ranked 3rd while SchemaSpy is ranked 6th. The most important reason people chose SQL Power Architect is:
Can convert databases and copy the data from tables.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Entity Relationship Digramming for nearly any JDBC-compliant database
SchemaSpy can analyze database metadata in order to reverse engineer ER (Entity Relationship) diagrams for any JDBC-compliant database which includes Oracle, MySQL, Sql-Server and Postgres among others.

Pro Has a GUI option available
SchemaSpy is a CLI tool. For people who prefer GUI-based tools there's one available from a different maintainer which stands on top of the CLI version.
Pro Convert
Can convert databases and copy the data from tables.
Pro OLAP schema modeling
Cubes, Measures, Dimensions, Hierarchies & Levels.
Pro Reverse engineering
Pro Drag and Drop
Cons

Con Does not work with schema dumpfiles
SchemaSpy has no methods for dealing with when you only have a schema generated via something like (mysqldump --no-data [options] >schema-only_dump.sql
) , and do not currently have access to a live database to connect with.

Con GUI option is a separate download by a different maintainer
Since the GUI version is from a different maintainer, it may be abandoned and eventually break if SchemaSpy development continues beyond that. Or it may implement new features much later than the CLI version.

Con Project may be dead or dying
The codebase on sourceforge hasn't seen an update since 2010.
Con The manual is not free
The SQL Power Architect User Guide costs $ 99.
