This app costs $2, the developer does not mention that in the description. However, it is one of the easiest to use nuclide charts around, and is very accurate. Only 4 stars because of the hidden purchase, but the price is negligible, considering what you are getting.
I initially got the issue where I payed for it and didn't download, but after trying again it worked, and I was only charged once.
This is the most fluid include table available, it looks nice and makes it easy to scroll and zoom.
I have yet to find any incorrect information yet, after comparing values to both Korean charts and BNL data. It is not all-inclusive with information but has mostly everything you could need for nuclear calculation, at least for introductory levels.