The iOS app was updated 7 years ago, and clicking the Google Play button leads to “page not found”. Seems abandoned to me.

Their data is crowd sourced, and they seem to have (or have had) users in many countries, so products available in your country might be available. But I haven’t used it so I can’t say what information they provide or how accurate it is.

Another app I’ve heard about is https://buyeuropean.io/
They’re running on US tech though.