I've heard that Cal AI can be a bit tricky when it comes to canceling subscriptions. If you're having trouble finding the option to cancel within the app, you might want to try checking your email for the initial confirmation email they sent when you signed up, it usually has a link to manage your subscription. Alternatively, you can also try contacting their customer support directly and ask them to cancel your billing, they should be able to assist you with that. It's also a good idea to check your payment method, if you paid through a third party like Apple or Google, you might need to cancel the subscription through them.