There are a few different business models that grocery apps can use. The most common is the subscription model, where users pay a monthly or annual fee to access the app's features.

Some apps also offer a la carte features that can be purchased individually. And finally, some apps use a freemium model, where basic features are free and premium features are available for purchase.

The subscription model is the most popular among grocery apps. This is because it offers a predictable revenue stream for the app developers.

Plus, it allows users to access all of the app's features without having to make individual purchases. The a la carte model is less common, but it can be used to offer users more choice in how they use the app.

For example, an app might offer a basic grocery list for free, but charge for extras like recipe integration or automatic grocery delivery.

The freemium model is less common still, but it can be used to entice users with basic functionality before upselling them on premium features.

For example, an  Grocery app might offer a limited number of recipes or grocery lists for free, but charge for unlimited access.