Type
Open Decoder Ring, type the message, choose your cipher number (or use a saved contact's).
Toy cipher · iPhone
Turn any message into a secret code only your friends can crack.
Decoder Ring runs entirely on your phone — no accounts, no servers, no one else can read it. Type, translate, share. Your friend decodes.
How it works
Three taps from gibberish to grin.
Every word in your message is looked up in a shared dictionary and replaced with the word a fixed number of positions ahead. Your friend's app shifts back by the same amount.
Translate
Tap Translate. Every word is replaced based on your cipher number. Hello becomes Hematologist.
Share
Send the cipher text to any chat app. Your friend pastes it into Decoder Ring and taps Decode.
What's inside
Built for fun, designed for trust.
Custom cipher numbers
Pick any number from 1 to 10,000. Higher numbers mean stranger gibberish.
Per-contact codes
Save up to ten friends or group chats. Each gets its own cipher number and dictionary.
Auto-shift
The cipher number bumps by one every day. Yesterday's code is already stale.
Multiple dictionaries
Switch between word lists, including British and American English.
On-device only
No accounts. No servers. Your messages never leave your phone.
Modern design
Beautiful light and dark modes. Native iOS feel from the first tap.
From every angle
What it actually looks like.
No mockups, no marketing renders — just the actual app running on iOS.
Not real encryption — just fun.
Decoder Ring is a toy cipher, not a security product. Anyone who knows your cipher number and dictionary can decode your messages. Don't use it for anything you actually need to keep private.
Be the first to know.
Decoder Ring is launching soon. Drop your email and I'll send one note when it hits the App Store — and an earlier one if you'd like to help beta-test.
One email at launch. Reply with "beta" if you'd like an earlier invite. No spam, no sharing.