Identifying paid and free apps in the App Store

Truly free apps have only have a Get button next to them.

Freemium apps have a Get button with In-App Purchases below the button. Might be free as is. Might require a subscription to keep using it after a set amount of time. May not require a subscription but isn't very usable without ponying up for the in-app purchases.

Straight up cost apps have a price listed rather than Get.

If it says in app-subscription then you know it isn't free.

Here is a screenshot of what meant. Two of them have In-App Purchases if you decide to use them.