OnlyU+
Private Messaging for Two ONLY
Only for iPhone
Free · In-App Purchases
iPhone
Most messaging apps promise privacy. 4UONLY delivers it.
No servers. No history. No traces — on either side.
When the conversation ends, it's gone. Completely.
4UONLY is a private messenger built for exactly one relationship - the one that matters most.
Unlike group chats and social feeds, 4UONLY connects you with a single trusted person through end-to-end peer-to-peer technology. No servers store your messages. No algorithms read your words.
HOW IT WORKS
Pair once with one person using an invite code or QR code. Your connection is direct, encrypted, and private by design.
Messages travel peer-to-peer via WebRTC - the same technology used for secure video calls - so they never touch a central server. When both of you agree, a message can be saved locally. Otherwise, it disappears when you close the app.
FEATURES
- One-to-one pairing: connect with exactly one trusted person
- P2P messaging: messages never stored on any server
- Messages leave no trace: nothing is saved locally unless your partner explicitly agrees
- Auto-clear on close: every message on both devices is permanently deleted each time the app closes
- Change your name anytime: update your display name whenever you like; your partner sees the change instantly. Can also change your partner's display name.
- Unpair in one tap: break the connection at any moment; all conversation history is deleted immediately with no trace left behind
- Encrypted channel: your conversation channel is always secured end-to-end
- Voice and video calls: clear, private calls directly between devices
- File sharing: send photos and PDFs up to 5 MB
- Face ID / Touch ID lock: biometric protection to ensure only you can use the app
- Screen capture protection: content is hidden when the screen is being captured or recorded
PRIVACY FIRST
4UONLY collects no personal data, not even your IP address. No account required. No phone number. No email. Your pairing information lives only in your device's secure Keychain and never leaves your phone.
FREE TRIAL AND PREMIUM
Your first 30 days are completely unlimited - no credit card required, no restrictions.
After your trial ends:
Free tier (always available):
- 100 messages per day
- 20 minutes of calls per day
4UONLY Premium:
- Unlimited messages
- Unlimited calls
- All future features included
Premium pricing:
- Monthly: US$1.99 / month
- Yearly: US$19.99 / year (save approximately 17%)
SUBSCRIPTION TERMS
- Payment will be charged to your Apple ID account at confirmation of purchase.
- Subscription automatically renews unless cancelled at least 24 hours before the end of the current period.
- Your account will be charged for renewal within 24 hours prior to the end of the current period at the same price.
- You can manage and cancel your subscription in your App Store account settings at any time after purchase.
- Any unused portion of a free trial period will be forfeited when you purchase a subscription.
TECHNICAL NOTE
4UONLY uses WebRTC peer-to-peer technology. On some networks, a TURN relay server may be used to establish the connection. Relay traffic is never logged or stored.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, SY YUAN CHEN, 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
- Provider
- SY YUAN CHEN
- Size
- 16.3 MB
- Category
- Social Networking
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later.
- iPhone
- Languages
- English and Traditional Chinese
- Age Rating
16+
- 16+
- Contains
Messaging and Chat
- In-App Purchases
Yes
- OnlyU Premium Yearly USD 19.99
- OnlyU Premium Monthly USD 1.99
- Copyright
- © SY YUAN CHEN