No. No additional fee has to be paid if you create a new athlete account. You always create a 30-days free trial account.
The trial account will become the athlete's permanent account (all of your planning, data, and actions remain intact) if the athlete pays by credit card inside the product within the trial period.
If the athlete decide not to start paying at the end of their 30-day trial, the license will be automatically converted into our free athlete product.