Favorite aquarium app?

I recently decided I need to do a better job keeping track of my tanks water parameters.
The best app I have found so far is called aquarium logger. It's available on Google play and is free.
I have found it to be very valuable. It let's me log/track anything I do to my tank whether it be a water change, filter change, or check water chemistry.
The best features are the ability to customize "actions" and "notes". There are quite a few already built in but you can add whatever you want to the list. For example, I can note when I changed pre filters on my rodi so I can look back and see how long it's been since they've been changed.
You can also track water parameters and even graph them over a period of time.
It's definitely a very useful app. I am curious if anyone else here has useful app they are using to keep track off aquarium days.

 

I'm the only one geeky enough to log water parameters with an app?

Man I need a life....