If you want a service to contact merchants for you: Rocket Money Premium is the established option — you flag a subscription, its team reaches out to the merchant, and cancellations typically take 2–10 days. The catch: it works from linked bank/card accounts, and concierge cancellation sits behind the paid tier. Hiatus offers similar help inside its flat $10/month or $48/year premium.
If you'd rather not hand over account access: Gravity was built for exactly this — you add the services you pay for, it tracks renewal and trial dates, and when you're ready to quit one it shows the official, source-verified cancellation steps so you can do it yourself in minutes. Nothing links to a bank. The honest map of the whole market — which apps actually cancel and which only remind — is at /blog/apps-that-cancel-subscriptions-for-you.
Whatever you choose, keep evidence. Concierge cancellations can fail quietly, and merchants sometimes keep billing after a "confirmed" cancellation. Save confirmation emails and reference numbers — the checklist at /guides/how-to-prove-you-canceled covers exactly what to keep and why.