Hi..I am a developer of zapddit. We are not using the same event to store the subscriptions today.

nostr:npub1cz2ve34nk0ukn0ph4yq2qx3ud8rfy5e0ak4epx42dn8gha0sdgpsgra9kv is working on this at the moment.

Positively sometime this week you can use all 3 softwares using the same subscriptions.