Yes. AppMachine offers monthly plans.
Say you're building an app for an event that takes place over the course of a single weekend. Paying a yearly subscription seems foolish in this case.
By paying for the app on a monthly basis, you can use publish the app a month before the event to keep attendees up to date on the latest developments and program highlight, have the app available during the event to send push messages about the event, keep the app live for a while after the event to allow people to send feedback about it, and then cancel the app. You'll have had the app live for only 2-3 months. This is much more efficient then creating a bespoke app for thousands of dollars.