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Kullo is a secure communication solution.

  • Communicate with your colleagues and friends across national borders and access your personal inbox on your mobile devices, no matter where you are.
  • We integrate industry leading end-​to-​end encryption right into the product. Literally no one apart from you and the recipient can read your documents - including us.
  • By hiding all the technical details and removing all distractions, you can simply focus on your content with your contacts.

Note: This application contains in-app and/or external

What's New

Version 50.0.0:
  • Show terms of service during registration
  • Disable OCSP checking to prevent Kullo from going down when the CA's infrastructure does
  • Bugfix: Draft without text was not sent in some situations
  • Update libkullo to v59
  • Update Botan to 1.11.34


  • OS X 10.9 or later

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Current Version (50.x)


Downloads 85
Version Downloads 85
License Free
Date 28 Dec 2016
Platform Intel 64 / OS X
Price Free
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