Show HN: Pi9eon – Send Real Postcards from iMessage

My co-founder Sandy and I built Pi9eon, an iMessage app that lets you send real physical postcards from any photo on your phone — with no account, no signup, and no need to know the recipient’s address.

Why: We were penpals before we were co-founders. We loved sending each other postcards while traveling, but they often got lost or delayed. We wanted a way to keep the tangible, meaningful part of postcards without the friction of stamps, postboxes, or international mail.

How it works:

Pick a photo in iMessage

Write your message

Send

Recipient gets a link to privately enter their address (“claim their Pi9eon”)

We use a vendor to print + ship via USPS (delivery in 7–10 days within the U.S., even from abroad)

Tech: Native iMessage extension. Addresses handled via a tokenized claim link. Minimal data stored; no accounts or social graph.

We’d love feedback from this community — on UX, privacy, or edge cases we should account for.

App link: https://apps.apple.com/us/app/pi9eon/id6753701299

Thanks, Maddie & Sandy