nost
Private Encrypted Messenger
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A privacy-first messaging app with end-to-end encryption, hybrid post-quantum encryption, secure voice calls, and Murmur—a public community for sharing short posts.
nost is a privacy-first communication app built for secure, simple, and reliable conversations.
Private messages and one-to-one voice calls are protected with end-to-end encryption (E2EE). Your conversations stay on your devices—not on our servers. Encrypted messages are temporarily stored only while awaiting delivery and are removed from the server after they have been delivered or read.
Key Features
• End-to-end encrypted one-to-one and group messaging
• Hybrid post-quantum encryption (PQC) for enhanced long-term security
• Secure end-to-end encrypted one-to-one voice calls
• Murmur, a public community for sharing short posts and connecting with people around the world
• On-device translation for Murmur posts and comments in supported languages
• Photos, videos, voice messages, files, stickers, reactions, replies, and message forwarding
• Sign in with Google, Sign in with Apple, or email
• nost Mode – automatically deletes messages within 5 minutes after they have been viewed
Privacy First
nost is designed to minimize the amount of personal data stored on servers. Your private conversations remain on your devices, while encrypted messages exist on our servers only temporarily for delivery before being removed.
Privacy is not just a feature—it’s the foundation of nost.
Your conversations belong only to you.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Performance improvements and bug fixes
The developer, SUNGDO PARK, 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 Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SUNGDO PARK
- Size
- 137.7 MB
- Category
- Social Networking
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, Hindi, Indonesian, Japanese, Korean, Simplified Chinese, Spanish, Thai, Traditional Chinese, Vietnamese
- Age Rating
13+
- 13+
- Infrequent
Profanity or Crude Humor
Alcohol, Tobacco, Drug Use or References
Contains
Messaging and Chat
User-Generated Content
Social Media
- Copyright
- © 2026 nostdio