From nostr:nprofile1qqsxg45ph8gx0vdrvtzta6xal7v86frx6jvstsnvhrlvtehmwwh4epqpzamhxue69uhhyetvv9ujuvrcvd5xzapwvdhk6tcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9nhwden5te0v4jx2m3wdehhxarj9ekxzmny9ua2vh28 an app that sends push notifications when certain events appear on the nostr.

Its a notification app. Excellent. Give it a go

Nostr 'Pull Notifications' on Android

https://github.com/KoalaSat/pokey

Worth checking out