Couldn't find any mention of a 3rd party security assessment? Open source doesn't
necessarily guarantee security though I'm really glad to see this is open source.
Given macOS's security track record - especially with High Sierra - and how particularly verbose Mach-O binaries tend to be, I'd be kinda worried about something relying so heavily on proprietary APIs (and potentially the system keystore?)
Though I'm sure using Keepass with Mono (that the Macpass site lightly implies is the only Keepass macOS alternative) isn't exactly an impenetrable fortress either haha
Got that Hopper license around here somewhere...