If you are a small business person where you either bill your time or need to monitor how you spend it then here’s an Android app that you may like. It’s called Jiffy and the free version will track up to 3 tasks at once. If you need to do more than there is a paid version. I like this model because you can use the free version for a while and see if you really will use it and benefit from it. Gizmodo is recommending this and if I billed time often I would try it.