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Turn your messages into
secret emoji codes

A language just for you and your friends — unreadable to anyone who doesn't know the code.

Download free — App Store See how it works
No account · No ads · No tracking — nothing ever leaves your phone
meet me at 6?
Encoding… 🌙✨🍩🐙🌵
😳 what does that mean
Four worlds

Pick the vibe for your secret code

Every theme swaps the alphabet for a different emoji set — same secret, different mood.

Yummy theme

Yummy

Snacks & sweets

Animals theme

Animals

Furry & wild

Space theme

Space

Stars & planets

Seasons theme

Seasons

Sun, snow & leaves

Why it's fun

More than a cipher — a whole ritual with your friends

🔑

A secret key between you

Add a shared password with a friend for a unique code nobody else can decode — even with the same theme.

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Challenge mode

Guess messages coded by other players. A correct letter instantly reveals every occurrence. Three difficulty levels, one hint, a daily streak.

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Journal

Find your coded messages again and mark your favorites — your whole secret history in one place.

How it works

Coded and shared in ten seconds

1

Write your message

Type anything you'd normally text a friend.

2

Tap Encode

Every letter becomes an emoji, instantly.

3

Paste anywhere

SMS, WhatsApp, Instagram, Discord — your friend taps Decode to read it.

Free forever. Private by design.

The core of Mysterymoji — unlimited encoding and decoding — is and always will be free.

🔒 No account required 🚫 No ads 👁️ No tracking 📴 Nothing leaves your phone
FAQ

Good to know

Is Mysterymoji really free? ⌄
Yes — encoding and decoding messages is unlimited and free, forever. That's the core of the app.
Do I need an account? ⌄
No. There's no sign-up, no login, and no data ever leaves your phone.
Can someone else decode my message without the key? ⌄
If you add a secret key shared with a friend, your code becomes unique — unreadable even by someone using the same theme.
What's Challenge mode? ⌄
Guess messages coded by other players: tap an emoji, propose a letter. A correct guess reveals every occurrence instantly. Three difficulty levels, one hint, and a daily streak to keep alive.
Which apps can I share codes on? ⌄
Anywhere you can paste text — SMS, WhatsApp, Instagram, Discord, and more.
Is it appropriate for younger teens? ⌄
Yes — Mysterymoji is rated for ages 13+, with no sensitive content, no ads, and no tracking.

Start your secret language today

Free on the App Store. No account, no ads, no catch.

Download free — App Store