Subscription

If you are not paying regularly to use the apps just delete them from your phone. Hold any app lightly until an "x" appears on the apps, and tap it.

If you are paying a regular subscription fee it is either directly to the app provider or to Apple. Here are the instructions for both situations:

• View, change, or cancel your subscriptions - Apple Support
• Get help with subscriptions not billed through Apple - Apple Support

View, change, or cancel your subscriptions - Apple Support

If you subscribed directly with the developer you will have to contact them to determine how to cancel it.