The free trial is FREE in every way. No credit card is required, and there are never any recurring charges for Firecracker. If a subscription lapses at any time, all progress and data will remain saved, so if you reactivate your account, you will pick up exactly where you left off. We cannot delete profiles; however, there is no obligation to reactivate an account that has expired naturally.
The Firecracker Daily Review iOS mobile app does allow for recurring charges (through Apple), but if you purchase your subscription through the med.firecracker.me/purchase webpage instead, then we do not support any automatic nor recurring charges.