This isn’t for me, but it may well be for you: Dayflow is for alloting time to specific tasks or goals. The example given is that you want to read for an hour every day. So you set that up and this app reminds you to do it, then tells you when you have.
I’ve been thinking about allotting time to particular projects so that I did keep them going, tootling along, so I’ve grabbed the app while it’s free. Usually Dayflow costs either 69p/£1.99 UK and 99c/$2.99 US so if it’s right for you, it’s bargain even if the brief sale is over by the time you click just about here.