Two cups and a piece of string.

Paper Cup is a small messaging device for children. It sends and receives messages from one phone, yours, and nothing else.

There's no web browser, no app store and no way to add anyone. Your child gets a keyboard, a screen and a direct line to you. Every message is end-to-end encrypted, so only the two of you can read it.

One line, two ends.

Their end

A small device with a keyboard and a paper-like screen. No browser, no apps, no contacts to add.

One line

It's paired with one phone, yours. Messages are end-to-end encrypted the whole way.

Your end

An app on your iPhone. You message them, they message you, and that's all it does.