Fold it like a laptop and the bottom half becomes a keyboard or touchpad for your VM.
Entertainment · iPhone Duo app
Knock Knock Simulator
by Justin McCahill
Shut the phone and the cover screen becomes the inside of your front door.
iPhone Duo support
Confirmed
- Confirmed in
- App Store description, version 1.8
- Version released
- Price
- $1.99
- Last checked
Checked by hand against the App Store.
Screenshots
Knock Knock Simulator on the App Store
Screenshots from the App Store. Tap one to see it full size.
On iPhone Duo
Knock Knock Simulator on iPhone Duo
On iPhone Duo the hinge is the door. Close the phone and the cover screen shows the inside of your front door: knock and whoever is outside knocks back, or look through the peephole to see who is waiting.
- Developer
- Justin McCahill
- Category
- Entertainment
- Price
- $1.99
- Platform
- iOS · iPhone Duo
Does Knock Knock Simulator support iPhone Duo?
Yes. iPhone Duo support is confirmed in the App Store description of Knock Knock Simulator version 1.8, released Nov 11, 2026.
How much does Knock Knock Simulator cost?
Knock Knock Simulator costs $1.99 on the US App Store.
Who makes Knock Knock Simulator?
Knock Knock Simulator is made by Justin McCahill and is in the Entertainment category.
