European Alternatives to Slack
Looking for a European alternative to Slack? While Slack is popular for team communication, it's owned by Salesforce and stores all messages on US servers accessible to the company.
European team messaging platforms offer secure collaboration with data sovereignty and self-hosting options.
4 European Alternatives to Slack
Nextcloud Talk
Team chat integrated with your file storage
Rocket.Chat
Open-source Slack alternative you can self-host
Why people leave Slack
Slack replaced internal email and made itself the place where decisions get made. That is precisely what makes it worth thinking about: over a few years, an organisation’s reasoning, its disagreements and its unguarded moments end up in one searchable archive.
That archive lives with Salesforce, in the United States, unencrypted end to end. It is readable by the provider, reachable by a US court, and on the free plan the parts older than ninety days are not reachable by you.
- The history is hostage to the plan On the free tier only the last ninety days are visible. The rest is not deleted — it reappears the moment you start paying. Your own institutional memory is the thing being priced, which is an uncomfortable position for the organisation that wrote it.
- Direct messages are not private People type things into a work DM they would never put in an email, on the assumption it is a private channel. On paid plans, export and Discovery tooling can reach message content including DMs, depending on configuration. That is a legitimate compliance capability. It is also not what most employees believe is happening.
- The AI clause moment In May 2024 the wording of Slack’s privacy policy on using customer data for machine learning, with an opt-out you had to request by email, caused a substantial backlash and was subsequently clarified. As with every incident of this kind, the durable lesson is not the specific policy but the mechanism: the boundary around your data is a document the vendor edits.
- US jurisdiction with EU customers If your works council, your legal team or your clients are European, the location of your internal discussion is a question that will eventually be asked. Salesforce offers EU data residency; it does not offer immunity from the legal system it is incorporated in.
What you have to replace, not just match
The trap in leaving Slack is treating it as a chat app. Chat is the easy part — everything here does channels and threads competently.
What is hard to replace is the connective tissue: the alerts your CI posts into a channel, the incident bot, the shared channels with clients and suppliers, and the search that people rely on to find a decision from eighteen months ago. Inventory your integrations and your external shared channels before you shortlist anything. That list, not the chat features, decides which option below is realistic for you.
How each alternative compares to Slack
Wire the one to pick when confidentiality is the requirement
Wire is Swiss, end-to-end encrypted by default for messages, calls and files, open source, and used in government and defence contexts where that guarantee has to hold. Compared with Slack it removes the entire category of concern: the provider cannot read the archive because it does not hold readable copies.
It is a communications tool rather than a workplace platform. The integration ecosystem is a fraction of Slack’s, and search across an encrypted history is inherently more limited. If your Slack is mostly conversation, this is a clean swap. If your Slack is where forty bots post, it is not.
Element the most capable option, with a jurisdiction footnote
Element is the flagship client for Matrix, an open protocol, and it is the closest thing here to a full Slack replacement: end-to-end encryption, bridges to other networks, threads, voice and video, and federation so two organisations can talk without either joining the other’s server. Several European public administrations run it at scale, which tells you something about whether it holds up.
Two things to be clear about. The company behind it is based in London, so it sits outside the EU post-Brexit under a UK adequacy decision. And the real answer for sovereignty is to host your own Matrix homeserver — at which point the company’s location stops mattering, and you own the operational burden instead.
Nextcloud Talk the sensible choice if you are already leaving other tools too
Nextcloud Talk is chat and calls inside the German Nextcloud platform. On its own it is a weaker Slack than Element. Alongside Nextcloud’s files, calendar and office documents, it is something Slack never was: one self-hosted system covering communication and collaboration together.
Consider this when Slack is not the only thing you are replacing. Migrating chat, files and documents to one European platform in a single project is often less work than three separate migrations, and it removes the integration problem by putting everything in the same place.
Rocket.Chat the closest feature match, if you will run it yourself
Rocket.Chat is the most Slack-like product on this page: channels, threads, apps, an admin console, webhooks that accept the same kind of payloads your CI already sends. For an organisation whose objection to Slack is jurisdiction rather than the interface, it is the smallest behavioural change your colleagues will notice.
It is an open source project rather than a European vendor, so what makes it European is where you run it. Self-host it in the EU and you have full control; use a hosted plan and you should check where that instance and its operator actually sit before assuming anything.
What actually breaks when you switch
Shared channels with clients and suppliers are the reason most Slack migrations stall. Those people are not moving, and there is no bridge for Slack Connect. Decide early whether you keep a minimal free Slack purely for external conversations — that is a common and reasonable outcome, but it should be a decision rather than a failure.
Your integrations will need rebuilding, not importing. Incoming webhooks are usually a one-line change; anything using the Slack API properly is not. Count them before you commit to a date.
History export is possible on paid Slack plans and is a large JSON dump that no destination imports cleanly. The honest approach for most organisations is to archive the export somewhere retrievable, tell people the search starts fresh, and accept that almost nobody will ever go looking.
Which one to pick
If confidentiality is the driver, Wire is the strongest guarantee and the simplest decision. If you want the fullest Slack replacement and can run infrastructure, a self-hosted Matrix server with Element is the most capable answer available, and the one European public bodies have converged on.
If you are already moving files and documents off US platforms, do not migrate chat separately — Nextcloud Talk turns three projects into one. And if your colleagues will revolt at anything that does not behave like Slack, Rocket.Chat is the closest match, provided you are willing to host it in Europe yourself.
Frequently Asked Questions
Wire is widely considered the best European alternative to Slack. Based in Switzerland, it offers encrypted team communication platform. Other excellent options include Element and Nextcloud Talk.
Yes, all European alternatives listed on this page are fully GDPR compliant. They process and store data within the European Union, following strict privacy regulations that protect your personal information.
European alternatives offer better data privacy under GDPR, data stored exclusively in EU data centers, no exposure to US surveillance laws like the CLOUD Act, and support for European digital sovereignty. They're ideal for businesses handling sensitive data and privacy-conscious individuals.
Who worked on this review
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