I am not a particular fan of technology, but have found this app helpful. It has some information about fasting, is really easy to use and not over powering with additional things.
It just lets you put in what fast you are doing next and tap to start and stop it then saves what have done. Nothing fancy, but I am enjoying popping on now and then to look at the countdown every fast, really don't want any 'DIDN'T REACH GOAL' tags on my graph. lol. It may just be me, but it is making me want keep closer to the plan I have made.