For us, aquarium enthusiasts, keeping a log of measurements and notes for our tank is a ritual that should be easy, fun, and beautiful like our tanks.
Features:
* Graph your data
* Logs grouping -- several measurements can be grouped into a group
* Spreadsheet view
* Unlimited number of aquariums
* Custom units
* Custom elements / measurements
* Integrated reminder with iOS reminder app so you can view them in it.
* Universal app, you can install this app on iPad and iPhone (you only pay once!)
* iCloud support -- your data will be available to all of your device where iCloud is enabled.