iStock has some nice features and is a useful if simple app. A major annoyance is that it does not retain the overlay choices between launches.

However, I have given up on iStock because today I found that my half of my portfolios had disappeared! Thankfully, the individual stocks are still in the general list. But, I have permanently lost all information about date of purchase, price, etc.

Be careful if you are relying on iStock to track your stocks!