Best European Alternatives to Slack

Why people leave Slack

Clear one thing out of the way first, because it is the claim most comparison pages lead with and it is wrong. Slack does offer European data residency, and not only at the top of the price list: Business+ and Enterprise customers can pin messages, canvases, files and the search index to Frankfurt, Paris, Stockholm, Zurich or London. Slack even sells Enterprise Key Management, where the customer holds the encryption keys.

The argument has to be sharper than geography, and Slack's own documentation supplies it. Whichever region you choose, member profiles, workspace and channel membership, seat counts, analytics and Slack-generated identifiers stay outside it. Whichever keys you hold, EKM covers messages, files and the index but not profiles, channel names, channel topics, channel descriptions, file names or who belongs to what. And the customer keys themselves live in Amazon's Key Management Service.

So at the most expensive configuration Slack sells, you can put every word your company has written inside the EU, hold the key yourself, and the shape of your organisation — who works on what, with whom, in which named room — still sits with a San Francisco company that has been part of Salesforce since 2021.

• Residency and key management stop at the org chart Slack publishes exactly what falls outside the region you choose and outside the keys you hold, and in both lists the same things recur: who your members are, which channels exist, what they are called and who is in them. For a workspace with channels named after clients, acquisitions or incidents, that metadata is frequently more revealing than the messages inside them. Nothing on Slack's price list moves it.
• The keys that protect you from a US provider sit with a US provider Enterprise Key Management is a genuine control and it deserves credit. It is also an add-on restricted to Enterprise Grid and Enterprise+, and the customer-managed keys are stored in Amazon's Key Management Service. If your risk assessment is about American legal process reaching an American company, putting the key in AWS has narrowed the problem rather than removed it.
• Ninety days, and then your own memory is behind a paywall On the free plan only the last ninety days of a workspace are visible. The older messages are not deleted; they return the moment you pay. Whatever you think of that commercially, it means the thing being priced is an organisation's recollection of its own decisions, and that is an odd asset to rent.
• It is not end-to-end encrypted, and it was never going to be Slack encrypts in transit and at rest and holds the keys unless you buy EKM, because search, link previews, compliance export and now AI summaries all require the service to read what you wrote. That is a coherent product decision rather than an oversight. It also means the baseline Slack — the one almost every customer is actually on — is a readable archive of everything your staff typed, including direct messages.

What you have to replace, not just match

Slack is three things in one subscription, and only one of them is chat. Decide which you are actually buying before you shortlist anything.

The first is the conversation: channels, threads, direct messages. Everything on this page does that competently and you will not choose on it. The second is the integration surface — the deploy notices, the alert routing, the incident bot, the approval flows that somebody wired in years ago and nobody has documented since. The third is Slack Connect, the shared channels with clients, agencies and suppliers who are on their own Slack.

The second and third are where migrations stall. Make the list of connected apps and external shared channels first. If that list is long, the honest answer may be that you keep Slack for the outside world and move the internal conversation somewhere your legal team is happier with.

The alternatives compared

How each alternative compares to Slack

What actually breaks when you switch

Start with the connected apps, not the messages. Every workspace has alerts, deploy notices, on-call escalations and approval flows that somebody wired in and left running, and the list only surfaces when one of them silently stops. Pull the app inventory from the admin panel before you announce anything.

Then deal with the outside. Shared channels with clients, agencies and suppliers are Slack-to-Slack and do not travel, and those counterparties did not agree to your migration. Expect to keep a small Slack workspace alive for external collaboration for a year, and budget for it rather than discovering it.

Finally, be honest about the archive. Public channels export as JSON on any plan; private channels and direct messages need the compliance export from a higher tier, and reactions, threading and file links all degrade on the way into another tool. Most organisations keep the export as a read-only archive and start clean, which works, but it is a decision people need to be told about rather than discover.

If Slack has EU regions, why would we move at all?

Because the two things your reviewers ask about are different. Where is the data stored is answered well by Slack: pick Frankfurt or Paris on Business+ and the messages, files and search index sit there.

Who can compel the company holding it, and what is left outside the boundary, are the questions residency does not answer. Salesforce, Inc. is a US corporation, and Slack's own documentation lists member profiles, channel membership and analytics as staying outside the region you selected regardless.

If the requirement came from a checklist about storage location, turn residency on and stay. If it came from someone asking who can see the shape of the organisation, no Slack configuration addresses it and moving is the only lever you have.

What does end-to-end encryption cost us in a team chat?

The same things it costs everywhere, and in a work tool they are more painful than in a private messenger. Server-side search across the whole workspace becomes limited, because the service cannot read what it is meant to index. Compliance export and legal hold get harder for the same reason. Link previews and rich unfurling either degrade or disappear.

Wire is the tool here that makes that trade by default, and it is honest about it. For a law firm, a works council or a team handling an acquisition, losing workspace-wide search is a price worth paying. For a two-hundred-person engineering organisation that lives in search, it is not.

Test search specifically, before anything else, with a query someone would really run. It is the single feature that decides whether this category works for you.

Can we keep Slack Connect with our clients?

Not as Slack Connect, no. Shared channels with an external company are a Slack-to-Slack feature and nothing here reproduces it in the same shape.

Element gets closest by a different route. Because Matrix federates, a room can contain people whose accounts live on entirely different servers run by entirely different organisations, which is the outcome Slack Connect achieves inside one vendor. Wire has guest rooms for external participants. Nextcloud Talk supports guest access to a conversation through a shared link.

The practical answer most organisations land on is to keep a Slack workspace alive for external collaboration and move the internal conversation. That is less satisfying than a clean break and it is usually what actually happens.

Is self-hosting a chat server a realistic plan?

It is, and all three options here support it. Nextcloud Talk installs into a Nextcloud you may already be running. Element can connect to a homeserver you operate, or to one run by a European host such as the managed hosting Element itself offers.

What makes chat harder than most self-hosted software is that it is real-time and everyone notices immediately. A wiki that is down for an hour is an inconvenience; a chat server that is down for an hour stops the company. Voice and video raise the bar further, because they need a media relay sized for the number of people who will actually dial in.

If nobody wants to own that on a Friday evening, pick a European-hosted service rather than a server that goes unpatched. That is the honest version of the self-hosting argument and it applies to more organisations than like to admit it.

Which one to pick

If you are leaving because Slack can read the workspace, Wire is the answer and the arithmetic is unusually kind: roughly €5.83 per user per month for end-to-end encryption, against €15 for the Slack tier that merely lets you choose a European city.

If you are leaving because you want the server under your own control, or because you need separate organisations in the same room, Element is the one built for that, and the German administration's openDesk is evidence that it survives real deployment.

If Nextcloud is already installed, try Talk before you buy anything at all. It is plainer than Slack and it is free, and for a lot of organisations the honest conclusion is that plainer is sufficient.