The decision implementing a certain payment model is always difficult. There were different reasons for me to choose subscriptions:
All users demand rightly that Wake Up Light works, is maintained, gets developed further and is adapted to new circumstances, such as new iOS versions, new iPhones/iPad and new HomeKit capabilities. This is fundamentally different from other (mostly physical) products that work regardless of changes to their environment. That’s why I believe that the payment for an app should be based on the usage of the app over time. This might not be the best option for every product or customer out there, but I believe it is for Wake Up Light, its customers and me.
Wake Up Light costs ~14.99€ per year, so every year you get to evaluate and decide if Wake Up Light is still holding up its value to you. That’s why I think a subscription (monthly or yearly) is a great and fair option for trying the app (7-days-trial), not wasting much money for short-term usage and for compensating the developer while enjoying the app.
But I can pay for other apps once!!1
Random user on the internet, 2023
Other apps try to compensate their income with their growth, meaning, that they rely on new users to pay for the app. These new customers have to pay a higher price, because they pay for older customers as well. With a niche app like Wake Up Light, there is not enough growth to support long-term customers without a recurring payment. A lot of popular apps change their business model to subscriptions exactly because of this problem.
If you find a different app suiting your needs that offer you a single payment option, please, go ahead.