If the goal is getting out of subscriptions: Gravity. Beyond renewal and trial-deadline tracking, it gives official-source-verified, step-by-step cancellation walkthroughs for each service — the piece most manual trackers skip. It's iPhone-only, $19.99/month or $59.99/year.
If you just want a clean list and reminders: Bobby (small one-time unlocks, long track record) or Subby (modern iOS 17 interface, $9.99 in-app purchases). If you want help entering everything: ReSubs can pull subscriptions from Gmail or a photo of a bill on iPhone and Android, and LowerMySubs is the fastest zero-signup audit — list what you pay in the browser and it hands you cancellation guides at no charge.
If you might want linking later: Finny works fully offline today with optional cloud features in its Pro tier, and PocketGuard can technically run on manual entry but is really built for linked accounts — expect friction if you never connect.