When comparing SchemaCrawler vs dbdiagram.io, the Slant community recommends SchemaCrawler for most people. In the question“What are the best SQL graphical schema viewer / editor / import/export programs?” SchemaCrawler is ranked 4th while dbdiagram.io is ranked 10th. The most important reason people chose SchemaCrawler is:
The text-based output serves for database documentation, and is designed to be diff-ed against other database schemas.
Specs
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Pros

Pro Many options for output formats in addition to graphical
The text-based output serves for database documentation, and is designed to be diff-ed against other database schemas.

Pro Extensive and detailed documentation online
Including visuals of the results of command-line option usage.

Pro Free
Pro Multi database
Can export to MySQL, PostgreSQL and SQL Server, can also import Ruby on Rails.
Pro Clean interface
Pro Ease of use
Cons
Con Need Java

Con Does not work with schema dumpfiles
SchemaCrawler 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 Limited free version
The free version allows 10 diagrams and advanced options like color can not be used.
Con No Crowfeet
Does not show "Crowfeet" symbols in relations.
