Yeah, there are three versions.
The original AppVerifier is just passively maintained, and the database it uses is deprecated and will be removed when accrescent makes its full release. The dev is not actively working on the app anymore.
There is also a fork from Privacy Guides that went the opposite direction of AppVerifier BG and slimmed the app way down to just focus on being a companion for their verified apps database, which is the same database AppVerifier BG uses.