We use flat pricing for retentio app. There is no usage limit in both trial and paid subscriptions. Features and usages is not limited to store size or number of products.
Trial subscription: Every retentio user starts with 14 days free trial period. During the trial, you will have full access to all the features of the app. There is no string attached, you can cancel the trial any time you want.
Paid subscription: Once the trial has ended, your plan will be automatically moved to a paid subscription. We use secured billing API of Shopify to manage our subscription and billing. You will be billed monthly.
Cancellation: If you want to cancel your subscription during the trial or paid period, simply uninstall the app or contact our support.