Love the on-device approach. The fact that it never phones home is a huge differentiator — most "utility" apps these days are just data collection with a feature attached. The regex filtering is clever. Have you thought about adding ML-based classification for notifications that are harder to catch with patterns? Something lightweight like a small on-device model could detect promotional vs. transactional notifications without needing manual rules. Also curious about battery impact — how often does it process the notification stream?