This is an accepted solution.
It looks like the app Mobile App Builder ‑ JCurve uses Shopify billing.
The billing subscription for any app that uses Shopify billing will automatically be terminated when you delete the app.
Shopify do not pro-rata a monthly subscription though. If you delete an app on the 10th day of a monthly 30 day cycle, you will still be billed for the full 30 days.
Therefore, it might best to check when your next billing cycle starts and delete it just before then.
Of course, this does not apply if you are still within a free trial period.
I hope this helps?