Don’t waste your money.

Like the other reviewers, I already bought and paid for the app. After the update, without warning, I am now forced into a yearly subscription if I want to continue using it. There was no mention of this in the update notes. That is dirty business. I felt like the app was barely worth it in the first place; its certainly not worth paying endlessly for it. Ill be deleting it and I recommend you avoid it entirely.

Notanymoar about Spark - Shift Calendar, v2.3.1