I like the presentation and the tide data. It works pretty well. However, when it got toward the end of the year (Dec 2014), suddenly the selected day was a year off - it would display the data for the same date in 2015. Using the date selector to select 2014 would not fix it. Using the date selector for 2013 would go to that date in 2013. So there was no way to display the correct date. I upgraded to Pro, which doesnt have that bug, though I dont like the presentation quite as well.
iPhone 5 with iOS 7.
Jon C. about Tide Graph, v3.5