Yes, you can upgrade your subscription to Aisle Premium or Aisle Concierge within the app.
To do so, open Aisle > tap on the Profile icon > tap on the subscription you want to upgrade to > select Upgrade.
To do so, open Aisle > tap on the Profile icon > tap on the subscription you want to upgrade to > select Upgrade.
iOS
When you choose to upgrade, you will be billed for the new plan price and the changes will reflect immediately. Apple will issue a refund for the remainder of your current subscription to your account.
Android
When you choose to upgrade, you will only be charged the difference between the subscriptions, and changes will reflect immediately. For example, if you are upgrading from Aisle Premium to Aisle Concierge, your billing amount will be equal to the Concierge price minus the Premium price.
Note: On Android, you will only be able to upgrade the subscription type but not the duration of the subscription. For example, if you are on a 1-month Premium subscription, your Concierge upgrade will be for 1-month only. If you are looking for a longer duration plan, we suggest you wait until your existing plan expires, and then resubscribe with your preferred plan.
For more information or help regarding the billing process, you can refer to Google Play Help.