I met my wife in Slowly. I can't reccomend it enough for a Pen pal experience.

Slowly lets you meet pen pals from your smartphone! Match with someone that shares your passions, write a letter, and collect stamps from around the world. Speak your mind—one letter at a time!

Letters take time to be delivered

The farther away your pen pal lives, the longer it will take to reach them. Why rush through replies? Make your letter be worth the wait!

https://slowly.app/

Interesting concept, and I’m glad the magic was there for the two of you.

Words and ideas are meaningful. Finding a physical artifact from a far off place in the mailbox; seeing the stamps, markings, smudges, and other evidence of its journey; opening the envelope; and reading the other’s handwritten words add another dimension. Similarly, holding a paper book is a different experience, so I suspect that more than nostalgia is at work.

What a neat idea. It's basically email, but it knows where you are and where your pen-pal is, and doesn't deliver the email until the appropriate snail-mail time between those locations passes? Brilliant.

i'd not heard of Slowly; googled, etc.

how sort of perversely lovely (i say it in an admiring manner), to meet in a gloriously old-fashioned manner on such a modern platform!

love it.

I've made many good, long-term friends through penpal sites, including my wife as well!