If you want charges found for you and don't mind linking accounts: Rocket Money is the default pick — the free tier surfaces recurring charges, and Premium (a pay-what-you-think-is-fair $7–$14/month) adds its cancellation concierge. Copilot Money is the better fit if you live on Apple devices and want real budgeting depth for $95/year, while PocketGuard suits people who mainly want a safe-to-spend number with subscription visibility attached.
If you refuse to link a bank account: Gravity is the pick when your goal is actually ending subscriptions — it tracks renewals and trial deadlines and gives official-source-verified, step-by-step cancellation walkthroughs for each service ($19.99/month or $59.99/year, iPhone). If you only want a tidy list with reminders, Bobby's one-time $0.99–$2.99 unlocks are hard to beat, and Subtrack adds iCloud sync across iPhone, iPad, and Mac. For a deeper look at iPhone-specific trackers, see /blog/best-subscription-tracker-app-iphone.
If you want someone to negotiate bills too: Rocket Money and Hiatus both attach negotiation to their tracking — Rocket Money charges 35–60% of the first year's savings, while Hiatus bundles negotiation into its $10/month or $48/year premium. For an honest breakdown of what these concierge services can and can't do, see /blog/apps-that-cancel-subscriptions-for-you.