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SQuirreL SQL vs IBExpert: catalog facts
SQuirreL SQL	IBExpert
Free Free and open source.	Paid Commercial software; editions and prices are listed on the developer's site.
Windows, macOS, Linux	Windows
Works with any JDBC-compliant database Plugin system for extra features	Dedicated to Firebird and InterBase Regular dated releases
Requires a Java runtime Interface feels dated next to newer clients	Windows only for the IDE Much of the website is in German
Downloadable app	Downloadable app
Open source	Closed source
License: LGPL-2.1	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.