Spending $10 once or $5/year for a subscription would make sense to me; but paying $15/year to use a to-do list (when discounted) is really excessive. This is a great tool - actually, I love it; but I find it ridiculous to pay so much just to TEMPORARILY unlock basic features like a calendar. Edit: Since writing the above review, I've found cheaper/free alternatives. The one I'm using is called Treat Yourself. It's free and doesn't look great, but it serves my needs just right and I love it.