It's your typical application with a minimalist design. It snapped a photo of you without you realizing it. And you felt something prick your thumb. When you pulled it back to look, you saw a tiny blood blister that soon disappeared. Before leading to the main application, a dog mascot gave you the app's instructions via text boxes.
Thank you for downloading "Swap Snap". Your one-stop, swapping app.
Using the app is easy as pie. With your phone's built-in camera, snap a photo of the body you want to swap. Worry not if the swap isn't immediate. Just sleep that very evening, and then wake up in your new body.
One thing to note. Swap Snap follows you wherever you are. Your blood is already sealed 𝘸𝘪𝘯𝘬! Also, your original body won't know about the swap. It's useless even if you tell them because their mind won't register any information about the app. Do it several times and you'll turn their brain to mush. That won't be a problem if that's your goal from the start.
Have fun!
You clicked next and it leads you to the main app itself, which only consists of a single camera button.