Conceptboard
EU NativeGDPR-compliant online whiteboard for visual collaboration, hosted in Germany.
Halle (Saale), Germany
EU Alternatives to Slack
Looking for European alternatives to Slack? Discover team communication tools that offer data sovereignty, end-to-end encryption, and compliance with EU regulations.
Best EU Alternatives to Slack
View all in category 1
2
openDesk
EU NativeOpen-source office and collaboration suite for public administration, combining email, files, chat, projects, and video meetings.
Bochum, Germany
Open Source
3
Calendar.online
EU NativeCalendar.online is a collaboration solution with open-source, self-hosted for business operations in EU organizations.
Germany
Open Source
Collabora Online
EU NativeCollabora Online is a collaboration solution with open-source, self-hosted for business operations in EU organizations.
Germany
Open Source
fruux
EU Nativefruux is a collaboration solution with open-source, self-hosted for business operations in EU organizations.
Germany
Open Source
Nextcloud Office
EU NativeNextcloud Office is a collaboration solution with open-source, self-hosted for business operations in EU organizations.
Germany
Open Source
Nuclino
EU NativeNuclino is a collaboration solution with open-source, self-hosted for business operations in EU organizations.
Germany
Open Source
Quick Comparison
| Feature | Conceptboard | openDesk | Calendar.online |
|---|---|---|---|
| Trust Level | EU Native | EU Native | EU Native |
| Headquarters | DE | DE | DE |
| Open Source | No | Yes | Yes |
| Free Plan Available | No | No | No |
How We Rank Alternatives
We rank alternatives using a transparent scoring system based on trust signals and verification:
- • Trust level (EU-native: 4 points, EU-hosted: 3, EU-compliant: 2, Non-EU risk: 1)
- • Verified sources (+2 points if 2+ sources available)
- • Recent verification (+1 point if verified within 180 days)
- • EU-only data option (+1 point if available)
- • No CLOUD Act exposure (+1 point)
Companies are strictly filtered to only show those in the same category. Scores determine ranking, with alphabetical order as tiebreaker.
Why Choose EU Alternatives?
Self-hosting options available
End-to-end encryption
EU data residency
Open protocols (Matrix)
Frequently Asked Questions
What are the privacy concerns with Slack?
Slack stores data on US servers and is subject to the CLOUD Act. Enterprise communications may be accessible to US authorities without EU legal oversight.
Can EU alternatives integrate with other tools?
Yes, solutions like Element support bridges to Slack, IRC, Discord, and other platforms, allowing gradual migration.