According to their FAQ[1], maybe. They test integration with KeePass, but it should work as long as you're using the .kdbx database format (KeePass v2.)
The latest version of KeePassX is using the same database format as KeePass2 and this app, so you should be ok. If you are using older (KeePass v1 compatible) format of the database just upgrade it in the lates version of KeePassX, it will convert all the data for you.
I use KeePassX on OS X. Will I be able to use this one with my database file?