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I'm sender!
I want to generate a code so my pen pal can confirm they received it, or I want to check if my pen pal has confirmed their code.

Create new code
Our codes do not contain any characters that can be confused in handwriting so you can safely write the code down by hand!
Our codes also never differ by only one character so even if your pen pal mistypes one character, they will never confirm a code belonging to another person.

Your history

Refresh status Add different code to history
Nothing except the code itself ever leaves your device. You will only see if the code has been confirmed, nothing else.
The history of codes is only saved inside your browser so make sure you write them down somewhere else, together with information which code belongs to which of your pen pal.
If this is a shared device, you can remove all code history (both sent and received) from this browser.