This is the ultimate app for taking the screenshot of Snapchat without letting the other person know.
Just install the app and you're good to go.

Keep Screenshotting!!

- omerjerk

Note:
Grant the permissions asked by the app for it to work properly.

P.S. If any good soul is willing to design a nice icon and cover photo for my app, I'll be more than happy to that good soul. Please reach out to me on my email. :)