Thank you for mentioning skedpal. I had never heard of it, and in the last week I've been thinking through the design of a very similar thing... the shininess of which is distracting me from working on the thing I actually want to be working on. Maybe I don't have to build the thing I was thinking about building.

Looks interesting. I just started working in a way that is perfect for that I think. Funny that their sign up is desktop only, as I tend to not get around to taking action if there’s an additional step in the way like that.