Subject, body and destination — copy, send through the official route, keep the confirmation.
| Topic | Details |
|---|---|
| Official route | device subscription settings (Apple/Google) or duolingo.com settings |
| Where to send the email | Duolingo help-center form — no public cancel email |
| Support hours | help-center form |
| Refund policy | runs to period end; app-store refunds go through Apple/Google's own request systems |
| Watch out | almost always app-store billed — the cancel lives in your phone's subscription settings |
| Watch out | streak and progress survive on the free tier; you lose unlimited hearts and offline |
| Watch out | free-trial conversions bill immediately at trial end — cancel 24h before |