Cipher: Offline Wi-Fi Chat
Chat over your own Wi-Fi
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Connects devices on the same Wi-Fi directly. Works where there is no internet. What it cannot do is written out in full.
When the other person is on your Wi-Fi, nothing passes through a relay. No phone number. No email. No account.
And the things this app cannot protect you from are written down inside it.
NO SERVER, BY DEFAULT
Cipher tries two transports in order. On the same network it connects over Bonjour, using no infrastructure at all. Only when that is unavailable does it fall back to a relay you chose yourself - and relays are off by default.
The transport in use is shown at the top of the screen, and each message carries its own mark: this one arrived over the LAN, this one went through a relay.
DRAKE/1
The cryptography is not homemade. X25519, Ed25519, ChaCha20-Poly1305, HKDF-SHA512 and ML-KEM-768 - widely reviewed standards, nothing else. What is ours is how they are assembled.
- Keys ratchet forward on every message, so a leaked key cannot open the past
- Headers are encrypted too: the message index and key rotations are invisible from outside
- Every message is padded up to one of a fixed set of sizes, so the exact length never travels
- The routing tag handed to a relay changes hourly, so you cannot be followed across time
- Between devices on iOS 26 or later, ML-KEM-768 post-quantum key exchange runs alongside
WHAT IT DOES
- One-to-one text, with replies, quotes, edits, reactions and search
- Disappearing messages, from send or from open, 10 seconds to 4 weeks
- Safety-number verification: 60 digits, or scan the QR to compare automatically
- Multiple accounts and disposable IDs
- Biometric lock, decoy vault, wipe PIN
- Encrypted backup and restore, CSV/JSON export
- Settings you can actually change, down to the last detail
WHAT WE ADMIT
A product that sells safety and then overstates it is itself a danger. Settings > What this cannot protect lists the limits in plain language: if the device itself is compromised, if the first key exchange was tampered with, if the person you are talking to copies the contents out, or if you need your IP address hidden - none of those are within reach of this app.
PRICING
Everything cryptographic is in the free version. Padding, header encryption, key ratcheting, safety-number verification, disappearing messages, blocking - none of it is limited. We do not hold safety hostage.
Cipher Pro adds convenience: 14-day relay retention, unlimited disposable IDs, cover traffic. The annual plan includes 7 days free.
Terms: https://revot.jp/apps/cipher/terms.html
Privacy: https://revot.jp/apps/cipher/privacy.html
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, REVOT, K.K., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- REVOT, K.K.
- Size
- 3.6 MB
- Category
- Social Networking
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 8 more
- English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- Contains
Messaging and Chat
User-Generated Content
- In-App Purchases
Yes
- Cipher Pro 月額 $6.99
- Cipher Pro 週額 $3.99
- Cipher Pro 買い切り $69.99
- Cipher Pro 年額 $39.99
- Copyright
- © 2026 REVOT, K.K.