Skiff is on the App Store. You write one letter, but you do not choose who gets it. A post office reads it and hands it to someone. If that person answers, the two of you are connected, and from then on the post office steps out.
What took the longest was not what to add but what to remove. There are no notifications. Delivery has no fixed time. An answer may come tomorrow or next week. The waiting is half of it.
A new letter can be written once a day. If no reply comes, you cannot write to that person again. Letters used to work that way.
The post office is a person. Every first letter is read by someone before it is passed on. Automating that would be far cheaper. But if nobody reads the first letter that arrives, this becomes a different app.
Why I made it: honestly, I wanted to send and receive letters like that. There are things you cannot write when the recipient is already decided — the ones that feel odd to say to someone you know and too much to waste on nobody. So I built a way to send them to someone undecided.
It is in Korean, on iPhone. There are five kinds of paper — plain, lined, grid, dot, airmail — and the person reading sees the letter on the one you chose.