Thank you for your feedback. The OvuSense App itself is free, the price includes the Sensor and subscription payment for access to the patented algorithm which enables OvuSense to confirm ovulation with 99% accuracy. We do offer a monthly subscription which you can sign up for and cancel at any time, should you wish to stop using your Sensor for any reason. I'd welcome the opportunity to discuss this further, to see how we can help you - please get in touch with me at caroline@ovusense.com at your earliest convenience. Best Wishes, Caroline - Customer Relations Manager, The OvuSense Team