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OFF Castle
No treasure inside. Messaging rooted in a physical die.
OFF Castle is end-to-end encrypted messaging whose keys come from a physical die, not just software. The server can't read your messages — not because it promises not to, because it can't.
Top comment
Hi everyone, I'm Enrico, and I've spent the last few months building OFF Castle on my own. The starting idea was simple: most encrypted messaging apps protect a treasure inside an increasingly fortified castle. I tried a different approach — remove the treasure. If the server never held the keys to read your messages, there's nothing to steal and no promise to keep. The unusual part: encryption keys come from a physical five-sided die you hold in your hand, combined with software cryptography — not from an algorithm alone. It's also built to resist future quantum computers, not just today's threats. You can chat one-on-one (Duo) or in small groups (Team) — same principle either way. I'm in pre-launch testing and looking for curious people willing to try it and tell me what's broken. I'll be here all day answering questions, including the uncomfortable ones. offcastle.com
About OFF Castle on Product Hunt
“No treasure inside. Messaging rooted in a physical die.”
OFF Castle was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #153 on the daily leaderboard. OFF Castle is end-to-end encrypted messaging whose keys come from a physical die, not just software. The server can't read your messages — not because it promises not to, because it can't.
On the analytics side, OFF Castle competes within Messaging, Privacy and Security — topics that collectively have 66.2k followers on Product Hunt. The dashboard above tracks how OFF Castle performed against the three products that launched closest to it on the same day.
Who hunted OFF Castle?
OFF Castle was hunted by Enrico Paracchini. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of OFF Castle including community comment highlights and product details, visit the product overview.