Personally, I have used einstapp.com and was quite satisfied and happy to find out the accurate results of who viewed my Instagram story. This is an excellent app that aids you to find out the stalkers of your Instagram account. There is no complexity or complication while downloading, installing and then using the app.
The best part about the einstapp.com is that it delivers 100% accurate results. Hence, you are aware and have knowledge of the individuals following or viewing your Instagram pictures and stories. In fact, those who view the maximum number of your posts or stories, you can initiate a communication with them as well, after all, they are your fans and followers. I have used this app and was quite amazed to find out the exact results who viewed my Instagram free of cost. Moreover, the app is also very useful to give you information about those who unfollowed, blocked and never followed back individuals as well.