Yes, Period Calendar Period Tracker offers a free version with basic functionalities, as well as premium features that may require a subscription.

While Period Calendar Period Tracker can be used offline for basic features, an internet connection is required for syncing data across devices and accessing certain online features.

Users can contact support or send feedback through the app's settings menu, where they can find options for customer support and feedback submission. Alternatively, they may visit the official website for additional contact information.

You can manage or cancel your subscription through your account settings in the app or through the app store where you purchased the subscription. Follow the provided instructions for your specific platform.