Cellcrypt 4+

Cellcrypt Inc.

    • 4.5 • 15 Ratings
    • Free



Cellcrypt enables security for communications that exceeds the standards for US Top Secret and incorporates Post-Quantum Protection.

Secure Instant Messaging
Cellcrypt provides secure instant messaging with the ability to send photos, videos, voice notes, and large files of any kind. All messages and files are end-to-end encrypted with a new key generated for every message or file sent. Cellcrypt’s enhanced Data at Rest encryption protects all files and media stored within the app.​

Group messaging for collaboration and file-sharing can be created locally by the user on their device.

Secure Voice and Video Calls
Cellcrypt voice and video calls are fully encrypted end-to-end and routed through the mobile device’s data connection with signal obfuscation. Advanced codecs ensure HD quality with minimal data and battery use, even across low-bandwidth mobile or wireless networks.

Secure calls can be made over any IP-based network, including 5G, 4G/LTE, 3G/HSDPA, 2G/EDGE, WiFi, and satellite networks, with full authentication of all parties on a call to eliminate the risks of impersonation through Caller ID spoofing.

Secure Conference Calls
A conference bridge can be established instantly from the Cellcrypt app by creating a group of contacts and hitting the call button. With only mutually authenticated, authorized users, Cellcrypt conference calls eliminate the need for participant PINs and passwords.

The ability to work anywhere, from any device, with file sharing, messaging, and voice/video calling, allows users to collaborate instantly and securely.

End-to-End Encryption
Cellcrypt uses double-layer encryption in an end-to-end configuration, with a new key for every call and message. The system is modular and adheres to best practice cryptographic standards/protocols, powered by a crypto core that is FIPS 140-2 compliant. With Cellcrypt, data is secured end-to-end using Elliptic Curve and Symmetric-Key Cryptography.

For post-quantum protection, the underlying cryptography is overlaid with Supersingular Isogeny Diffie-Hellman Key Exchange (SIDH 751) for voice and video and Supersingular Isogeny Key Encapsulation (SIKE 751) for messaging and files.

For more information, please visit www.cellcrypt.com or contact support@cellcrypt.com for further assistance.

What’s New

Version 4.4.14

What's new:
- Stability improvements for iOS 16.1

Ratings and Reviews

4.5 out of 5
15 Ratings

15 Ratings

Ndovkagwifkahg ,

Good for Privacy

If you don’t feel comfortable sending/receiving specific messages through a default phone app, this is for you!

Romancagg ,

Great app

Well-designed and stable app. Easier to use than anticipated. Calls are very clear. Gives users peace of mind when discussing sensitive/private info. I now feel a tad exposed when making calls through other means.

Ras A Ghul ,

Super clear voice overseas plus crypto!

Excellent voice service across the globe. I see why General Dynamics is using this voice crypto for the secret comms. solution.

App Privacy

The developer, Cellcrypt Inc., 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 Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Siri

    Get things done within this app using just your voice.

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