A lot of people are asking for Firebird versus PostgreSQL comparison. This is a difficult task - both databases have much in common. For the beginning, let's start with Firebird's advantages:

• Mature Windows support. Firebird is supported on Windows for a very long time and it's well tested. PostgreSQL supports Windows natively since 8.0. Still only a few months...
• Mature ADO.NET provider. Npqsql (PostgreSQL ADO.NET provider) is still in beta. Firebird ADO.NET provider supports the embedded Firebird, services API (backup, restore, statistics, batch SQL execution...).
• Embedded version. Embedded version (with 2 MB runtime and easy switching to a standalone server) seems to be one of the biggest advantages of Firebird.
• Windows 98 support. PostgreSQL runs natively only on Windows NT-based versions.
• Licensing. LGPL (Npgsql is covered by LGPL) seems to be less commercial-friendly than IPL (at least it is a much less clear language).
• This blog ;-)

See also

• Firebird versus Microsoft SQL 2005 Express
• Firebird versus MSDE 2000
• Firebird versus Microsoft Jet