Ill look into that, sounds like a good app. In with you. If my wife find out how much I've spent putting this together she will kill me...lolI use Aquarimate. Good tracking app for parameters, tasks, expenses (I have no intention on using that part - Ha), reminders, stock list, wish list, etc. Shows charts to compare stabiity and I use reoccurring reminders pretty often.
There is a small one time fee to buy the app, I think $5 or $10.
Thx Ill look into that one as well. FREE....I use Aquarium Note and love it. (It's also free!) You can setup notifications/reminders for maintenance items, track your parameters and set optimum ranges. You can also keep track of livestock, add multiple tanks, and a lot more. It's a pretty well-made app and any ads are minimal and not intrusive imo.