No, there is no monthly or ongoing fee for using Roost devices. There is a one-time cost for the Roost Smart device, and you can download the Roost app, or any of our insurance partner apps, to your smartphone for free.
Please note, that the Apple App Store may give you a message about entering a credit card, even when you try to download any free Apple app.
Apple's support website has an article: Create or use an Apple ID without a payment method, which may help you to set up your Apple account so that you do not need to enter a credit card to download an Apple app.
Please keep in mind, if you download any Apple app that says "Free", you will not incur a charge to your credit card, even if you have a credit card associated with your Apple ID.