Threema Work

🇨🇭 CH

3.4/5· 79 reviews across 4 portals

Swiss end-to-end encrypted team messenger with on-premise option

GDPROpen sourceISO 27001

Threema Work is a Swiss team messenger for businesses requiring maximum privacy. It offers end-to-end encrypted text, voice and video calls, group chats, file sharing and screen sharing. A management cockpit enables centralized user and permission control. Data is hosted in Switzerland in ISO 27001 certified data centers, and the service is GDPR compliant. The open-source software undergoes regular independent audits.

Replaces

Threema Work is sought as a European alternative to:

Slack

EU Trust Profile

3 of 9 criteria verified with evidence, last checked 2026-08-16. Every ✓ links to its source.

Data Processing Agreement (DPA)
The Data Processing Agreement is automatically concluded upon acceptance of the Terms of Service.
Evidence →
Trust center / security pagenot offered
EU data residency
Customer data is processed and stored exclusively on Threema's own servers in two ISO 27001-certified data centers in Zurich.
Evidence →
Public sub-processor listnot verified
ISO 27001Colocation partner's data centers in Zurich
Evidence →
SOC 2not verified
BSI C5not verified
TISAXnot verified
Local-language supportnot verified

✓ verified: publicly documented at the linked source on the check date. ✗ not offered: the vendor documents that they do not provide it. – not verified: we found no public evidence either way — not a finding against the vendor. The vendor's own information prevails.

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Threema Work — verified European company on tech-from-europe.eu

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