Yes, Fancy Battery: Booster Cleaner offers a free version with basic features, along with an option for a premium subscription that unlocks additional functionalities.

No, Fancy Battery: Booster Cleaner does not require a continuous internet connection to function, although some features may benefit from online access.

You can contact support or send feedback through the app's help section, or by visiting the official website where you can find contact information and support forms.

You can manage or cancel your subscription through the app's settings or directly through your device's app store subscription management options.