Fees are not applied to recurring subscriptions (Starter and Pro).
However, all transactions that include direct purchases (Report Packages) are charged with fees that are applied by the payment service provider.
The amount of fee depends on your payment method, billing country and currency.
If you choose bank card payment type you will see an exact amount of fee right in HypeAuditor interface. Example:
You can learn more about how these fees are calculated from Stripe connect page.
If you choose PayPal as your payment method, the exact amount of fee will be calculated by PayPal when you fill in your PayPal account details.
You can learn more about how PayPal fees are calculated from PayPal website.