Threema OnPrem. Self-Hosted

Maximum security and total data ownership with Threema OnPrem for enterprises

Threema GmbH · ch.threema.app.onprem

Not rated yet 50K+ downloads v6.5.3o 43.8 MB Android 7.0+ PEGI 3 · Everyone

Download APK 43.8 MB All versions

Signature matches the Google Play version Details

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At a glance

Latest version: v6.5.3o (9001216)
Updated: Oct 1, 2026 (8 days ago)
APK size: 43.8 MB
Requires: Android 7.0+ (API 24)
CPU support: x86 64-bit
Category: Communication (app)
Permissions: 41 (14 sensitive)
Website: threema.ch/onprem
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Threema OnPrem. Self-Hosted is an app by Threema GmbH in the Communication category. It includes native code only for x86 64-bit, so it won't install on ordinary ARM phones (only on x86 devices such as emulators and some Chromebooks).

Since version 5.6.1o, the minimum Android version rose from 5.0 to 7.0. It asks for 41 permissions, 14 of them sensitive, including precise location, camera and record audio. It asks for the same permissions as version 6.5.2o.

What's new in v6.5.3o

- Fixed a bug related to automatic file downloads - Improvements to contact synchronization - Various improvements and bug fixes

Description

From the listing uploaded by “appupdater”.

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!

Version history

6 versions are listed, going back to v5.6.1o. New versions arrive here about every month. Since v6.3.0o it requires Android 7.0+.

v6.5.3o LATEST Oct 1, 2026 43.8 MB TRUSTED v6.5.2o Sep 8, 2026 44.3 MB TRUSTED v6.5.1o Aug 19, 2026 44.2 MB TRUSTED v6.5.0o Jul 28, 2026 43.9 MB TRUSTED v6.3.0o Dec 15, 2025 42.6 MB TRUSTED

All 6 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Oct 1, 2026.
Certificate issued to “Threema GmbH” This is the certificate of the Google Play version.
Same certificate as the 3 other versions checked

Store checks and file details

Developer signature verified Oct 1, 2026
Validated against Google Play Oct 1, 2026
Signed byCN=Threema GmbH, O=Threema GmbH, L=Pfaeffikon, ST=SZ, C=CH
Signing certificate (SHA-1)8E:7C:71:6C:9C:90:15:F9:17:FC:B5:E7:68:B8:09:82:FA:E4:9A:60
File MD54d9ca8a860d0161a4f5bec53b025852c
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (3 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (41)

Threema OnPrem. Self-Hosted requests 41 permissions, 14 of them sensitive.

Answer phone calls Sensitive android.permission.ANSWER_PHONE_CALLS
Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
Bluetooth connect Sensitive android.permission.BLUETOOTH_CONNECT
Call phone Sensitive android.permission.CALL_PHONE
Camera Sensitive android.permission.CAMERA
Find accounts on the device Sensitive android.permission.GET_ACCOUNTS
Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
Read contacts Sensitive android.permission.READ_CONTACTS
Read media images Sensitive android.permission.READ_MEDIA_IMAGES
Read media video Sensitive android.permission.READ_MEDIA_VIDEO
Read media visual user selected Sensitive android.permission.READ_MEDIA_VISUAL_USER_SELECTED
Read phone status and identity Sensitive android.permission.READ_PHONE_STATE
Record audio (microphone) Sensitive android.permission.RECORD_AUDIO
Write contacts Sensitive android.permission.WRITE_CONTACTS
Add home-screen shortcuts com.android.launcher.permission.INSTALL_SHORTCUT
Authenticate accounts android.permission.AUTHENTICATE_ACCOUNTS
Control vibration android.permission.VIBRATE
Foreground service data sync android.permission.FOREGROUND_SERVICE_DATA_SYNC
Foreground service media playback android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK
Foreground service microphone android.permission.FOREGROUND_SERVICE_MICROPHONE
Foreground service remote messaging android.permission.FOREGROUND_SERVICE_REMOTE_MESSAGING
Full network access android.permission.INTERNET
Home provider insert badge (custom) com.sonymobile.home.permission.PROVIDER_INSERT_BADGE
Internal broadcast protection (app-defined) ch.threema.app.onprem.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Launcher change badge (custom) com.huawei.android.launcher.permission.CHANGE_BADGE
Launcher read settings (custom) com.huawei.android.launcher.permission.READ_SETTINGS
Launcher write settings (custom) com.huawei.android.launcher.permission.WRITE_SETTINGS
Manage accounts android.permission.MANAGE_ACCOUNTS
Modify audio settings android.permission.MODIFY_AUDIO_SETTINGS
Prevent the device from sleeping android.permission.WAKE_LOCK
Read sync settings android.permission.READ_SYNC_SETTINGS
Receive push notifications com.google.android.c2dm.permission.RECEIVE
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
Show notifications android.permission.POST_NOTIFICATIONS
Use biometric hardware android.permission.USE_BIOMETRIC
Use fingerprint hardware android.permission.USE_FINGERPRINT
Use full screen intent android.permission.USE_FULL_SCREEN_INTENT
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE
Write sync settings android.permission.WRITE_SYNC_SETTINGS

Threema OnPrem. Self-Hosted APK: questions and answers

Is there a version of Threema OnPrem. Self-Hosted for older Android phones?

The current version needs Android 7.0 or later. Version 5.6.1o is the newest listed build that installs on Android 5.0 and later. Get version 5.6.1o · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Threema OnPrem. Self-Hosted APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 3 other versions checked. After downloading, check that the file's MD5 is 4d9ca8a860d0161a4f5bec53b025852c.