Threema OnPrem
Self-Hosted Business Messaging
Free
Threema OnPrem is the self-hosted communication solution for organizations with the highest security requirements. The combination of Threema’s proven security architecture and complete data sovereignty creates an independent communication environment that is unmatched in terms of confidentiality – ideal for government agencies, police forces, and industrial companies.
Advantages of Threema OnPrem:
• 100% data sovereignty through hosting on your own servers
• Proven Threema security architecture
• Confidential communication in teams, groups, and projects
• End-to-end encrypted voice and video calls
• Secure exchange of files and documents in all formats
• Cross-platform use thanks to mobile app, desktop app, and web client
• Additional protection of confidential chats with PIN or fingerprint
NOTE: Before you can use this app, Threema OnPrem must be set up on your company server. For more information, visit threema.com/onprem.
Enjoy using Threema OnPrem!
more • New: This update includes the first adjustments to the new Liquid Glass design
• New: The navigation logic has been completely overhauled while simultaneously improving the design of the iPad app
• New: All Chats export
• Redesign of interfaces for a more modern appearance:
• Contacts-Tab
• Threema Safe
• Message forwarding
• New: Forwarding media now includes captions
• Added new emojis for emoji reactions (requires iOS 26.4)
• Fixed various bugs related to Threema calls
• Fixed various bugs related to Threema Safe
• Various bug fixes and general improvements
7.1.1 Apr 27
• Fixed various bugs that could occur when connecting to Threema Web
Threema OnPrem 7.0.6o
• Various bug fixes and general improvements
Threema OnPrem 7.0.5o
• Various improvements related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.4o
• New: screenshots can be disabled via app configuration in the management cockpit’s app configuration
• Fixed a bug that caused messages to be sent late when switching networks
• Fixed various bugs related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.3o
• Fixed a bug that prevented logging in with a new username or password
• Fix crash during backup restore when Threema Safe URL was preset via MDM
Threema OnPrem 7.0.2o
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.7 Apr 9
• Various bug fixes and general improvements
Threema OnPrem 7.0.5o
• Various improvements related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.4o
• New: screenshots can be disabled via app configuration in the management cockpit’s app configuration
• Fixed a bug that caused messages to be sent late when switching networks
• Fixed various bugs related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.3o
• Fixed a bug that prevented logging in with a new username or password
• Fix crash during backup restore when Threema Safe URL was preset via MDM
Threema OnPrem 7.0.2o
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.6 Mar 30
• Various improvements related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.4o
• New: screenshots can be disabled via app configuration in the management cockpit’s app configuration
• Fixed a bug that caused messages to be sent late when switching networks
• Fixed various bugs related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.3o
• Fixed a bug that prevented logging in with a new username or password
• Fix crash during backup restore when Threema Safe URL was preset via MDM
Threema OnPrem 7.0.2o
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.5 Mar 23
• New: screenshots can be disabled via app configuration in the management cockpit’s app configuration
• Fixed a bug that caused messages to be sent late when switching networks
• Fixed various bugs related to restoring a Threema Safe backup
• Various bug fixes and general improvements
Threema OnPrem 7.0.3o
• Fixed a bug that prevented logging in with a new username or password
• Fix crash during backup restore when Threema Safe URL was preset via MDM
Threema OnPrem 7.0.2o
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.4 Mar 16
• Fixed a bug that prevented logging in with a new username or password
• Fixed a crash that could occur during a backup restore when the Threema Safe URL was preset via MDM
Threema OnPrem 7.0.2o
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.3 Mar 6
• Fixed a bug that prevented logging in with passwords containing special characters
• Various bug fixes
Threema OnPrem 7.0.1o
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.2 Mar 4
• This version supports iOS 17 and newer
• A more modern look with redesigned screens for
• Adding contacts
• Creating groups
• Starting a new chat
• Creating and viewing polls
• Previewing file messages and full-screen images
• Selecting a document or contact
• Scanning QR codes
• Editing your profile
• Linking a phone number or email address
• Setting a revocation password
• ID export
• More reliable Threema Calls
• Various under-the-hood changes
• Various bug fixes and general improvements
7.0.1 Mar 2
Threema OnPrem 6.8.8o
• Various bug fixes and general improvements
• Starting with the upcoming major app version, iOS 15 and 16 will no longer be supported
6.8.8 12/09/2025
Threema OnPrem 6.8.7o
• Various bug fixes and general improvements
6.8.7 10/29/2025
Threema OnPrem 6.8.6o
• Fixed an issue in relation to sharing screenshots
• Fixed an issue in relation to device linking
• Fixed an issue in relation to storage management
• Various bug fixes and general improvements
6.8.6 10/07/2025
Threema OnPrem 6.8.5o
• Improvements in relation to group calls
6.8.5 09/10/2025
Threema OnPrem 6.8.4o
• Adjusted the color scheme in the app to improve the readability of texts
• Fixed a bug in relation to stickers
• Various bug fixes and improvements
6.8.4 08/27/2025
Threema OnPrem 6.8.3o
• Fixed a bug in relation to voice messages
• Added “Alarm” as a custom call sound
• Various bug fixes and performance improvements
Threema OnPrem 6.8.2o
• Updated the logo and color scheme to reflect the new corporate design
Threema OnPrem 6.8.1o
• This update requires iOS 15.8 or above
• Added Bulgarian localization
• Fixed a bug in relation to linked contacts
• Various improvements and bug fixes in relation to notifications, voice messages, individual calls, and group calls
• General performance optimization
6.8.3 07/22/2025
Threema OnPrem 6.8.2o
• Updated the logo and color scheme to reflect the new corporate design
Threema OnPrem 6.8.1o
• This update requires iOS 15.8 or above
• Added Bulgarian localization
• Fixed a bug in relation to linked contacts
• Various improvements and bug fixes in relation to notifications, voice messages, individual calls, and group calls
• General performance optimization
6.8.2 06/30/2025
Threema OnPrem 6.8.1o
• This update requires iOS 15.8 or above
• Added Bulgarian localization
• Fixed a bug in relation to linked contacts
• Various improvements and bug fixes in relation to notifications, voice messages, individual calls, and group calls
• General performance optimization
6.8.1 06/16/2025
Threema OnPrem 6.7.1o
• Improved connection to the server
• Fixed a bug in relation to recording and sending video messages
• Fixed a bug in relation to processing incoming messages from an unknown sender
• Improved file synchronization between the mobile app and Threema for desktop
• General performance optimization
6.7.1 04/07/2025
• New: You can now react to messages with emoji
• Various other improvements and bug fixes
Threema OnPrem 6.6
• Overhauled appearance of the agree/disagree icons (in preparation for the upcoming emoji reactions feature)
• Various other improvements and bug fixes
6.6.2 02/24/2025
• Overhauled appearance of the agree/disagree icons (in preparation for the upcoming emoji reactions feature)
• Various other improvements and bug fixes
6.6 01/27/2025
• Various improvements to the storage management
• Fixed a bug where messages could not be forwarded to some contacts
• Various other improvements and bug fixes
Threema OnPrem 6.5
• Added Blocked Contacts list
• Text formatting is now shown in the edit history
• Removed Romansh language
• Fixed a bug where deleted messages could still be quoted
• Various other improvements and bug fixes
6.5.1 01/07/2025
• Added Blocked Contacts list
• Text formatting is now shown in the edit history
• Removed Romansh language
• Fixed a bug where deleted messages could still be quoted
• Various other improvements and bug fixes
6.5 12/09/2024
• Threema 2.0 for desktop: You can now link two computers with your mobile phone
• Fixed a bug that prevented some videos recorded with iPhone 16 devices from being sent
• Various other improvements and bug fixes
6.4.1 11/18/2024
• Various minor improvements
Threema 6.3.1
• New: Overhauled the appearance of avatars
• New: Voice messages can be played back at 1.25x speed
• New: Only the creator of a poll receives the poll’s status messages
• New: The message to be quoted or edited is saved with drafts
• Various improvements for voice messages
• Various other improvements and minor bug fixes
6.3.2 10/16/2024
• New: Overhauled the appearance of avatars
• New: Voice messages can be played back at 1.25x speed
• New: Only the creator of a poll receives the poll’s status messages
• New: The message to be quoted or edited is saved with drafts
• Various improvements for voice messages
• Various other improvements and minor bug fixes
6.3.1 10/07/2024
• Fixed a bug in relation to the group management
Threema OnPrem 6.2.1o
• New: Sent messages can be edited or deleted on the recipient’s end
• Various improvements for group calls
• Fixed various bugs that occurred when selecting and sending media
• Fixed various bugs that occurred when recording and sending voice messages
• Various other improvements and minor bug fixes
6.2.2 09/12/2024
• New: This update includes the first adjustments to the new Liquid Glass design
• New: The navigation logic has been completely overhauled while simultaneously improving the design of the iPad app
• New: All Chats export
• Redesign of interfaces for a more modern appearance:
• Contacts-Tab
• Threema Safe
• Message forwarding
• New: Forwarding media now includes captions
• Added new emojis for emoji reactions (requires iOS 26.4)
• Fixed various bugs related to Threema calls
• Fixed various bugs related to Threema Safe
• Various bug fixes and general improvements
more Version 7.1.1 Apr 27
Data Linked to You The following data may be collected and linked to your identity:
Data Not Linked to You The following data may be collected but it is not linked to your identity:
Supported Features
VoiceOver
Voice Control
Larger Text
Dark Interface
Sufficient Contrast
Reduced Motion
Audio Descriptions 
