Tabby charges your subscription based on your billing cycle: monthly or annually, depending on which plan you chose.
Billing Schedule:
Monthly Plans: You’re charged on the same day each month that you signed up. For example, if you subscribed on the 15th, you’ll be billed on the 15th of each month.
Annual Plans: You’re charged once per year on your subscription anniversary date.
You’ll receive an email receipt after each successful charge. You can view your billing history in Settings > Subscription > Billing History.