Alternatives · 2026
7 Slack alternatives, honestly compared.
Slack made team chat pleasant — and then the tool count, the integration sprawl and the notification load piled up. If chat is where your work starts but never where it finishes, or if compliance now asks where your messages physically live, looking around is reasonable.
This guide compares seven real alternatives. One of them is our own product; we say so on its card and keep the same honest-caveat rule for it as for everyone else.
Five questions worth asking before you switch.
- (01)
Where does your data live?
Cloud-only, or can you run it on your own servers — in your region, under your keys?
- (02)
How much of the work does it cover?
Chat alone, or also the tasks, docs and calls that chat keeps pointing at?
- (03)
What does the pricing model reward?
Per-user plans are fine — per-user plans plus five paid satellite tools are how sprawl happens.
- (04)
What are your exit options?
Open source, data exports and standard formats decide how hard leaving will be later.
- (05)
Who runs it on day two?
Self-hosting is freedom and a responsibility. The admin and ops story matters as much as the feature list.
The seven contenders.
- 01(01)
Polybase
Our productThe sovereign team workspace
Full disclosure: Polybase is our product. Read this entry as the maker's perspective — the caveat below is as real as everyone else's.
Polybase folds chat, calls, tasks, docs, email and workflow automation into one workspace instead of a chat tool plus a belt of integrations. It runs as EU-region cloud, in your own VPC, or fully self-hosted — including air-gapped setups where it runs fully offline (calls use a self-hosted LiveKit server). Pricing is plain: Core at €10 per user/month, optional add-ons on top.
- Best for
- Teams replacing Slack plus three or four satellite tools, and organisations that need a self-host option.
- Hosting model
- EU cloud, private VPC, or self-hosted / air-gapped (Docker Compose).
- Honest caveat
- A young product: SOC 2 and ISO 27001 are on the roadmap, not held; SSO/SAML likewise.
- 02(02)
Mattermost
Open-core chat for technical teams
Mattermost is an open-core messaging platform aimed squarely at technical and security-conscious teams, with strong DevOps workflows around incidents and playbooks. The free edition can run on your own servers, with advanced capabilities in paid editions.
- Best for
- DevOps and platform teams that want Slack-style channels on their own infrastructure.
- Hosting model
- Self-hosted (Docker/Kubernetes) or vendor-hosted cloud.
- Honest caveat
- Chat-first by design: docs, project boards and email still live in other tools, and several enterprise features sit behind paid editions.
- 03(03)
Rocket.Chat
Open-source chat with an omnichannel twist
Rocket.Chat is one of the longest-running open-source Slack alternatives, with an unusual extra: omnichannel support for talking to customers on the same platform. It has a real footprint in public-sector and regulated environments.
- Best for
- Organisations that want open-source team chat and customer-facing messaging in one deployment.
- Hosting model
- Self-hosted or Rocket.Chat's hosted cloud.
- Honest caveat
- The admin surface is large, and a number of advanced capabilities are reserved for paid plans.
- 04(04)
Element (Matrix)
Decentralised messaging on an open protocol
Element is the flagship client for Matrix, an open, decentralised protocol with federation and end-to-end encryption. Instead of trusting one company's server, you can run your own homeserver and still talk to the wider Matrix network.
- Best for
- Organisations that value federation, E2EE and protocol-level openness above all else.
- Hosting model
- Self-hosted homeserver or managed hosting from Element.
- Honest caveat
- Running Matrix well is real operations work, and day-to-day polish — threads, search, admin UX — trails the centralised tools.
- 05(05)
Zulip
Topic-threaded chat for async teams
Zulip is open-source team chat built around one strong idea: every message belongs to a topic, so busy channels stay readable and asynchronous catch-up actually works. It is a favourite of distributed teams and open-source communities.
- Best for
- Async-heavy, distributed teams that care about readable history more than real-time buzz.
- Hosting model
- Self-hosted or Zulip Cloud.
- Honest caveat
- The topic model is genuinely different; teams that don't adopt its discipline lose most of the benefit.
- 06(06)
Microsoft Teams
The Microsoft 365 default
Teams is the default Slack alternative for organisations already paying for Microsoft 365 — chat, meetings and Office files under one licence. If your company lives in Outlook and SharePoint, it is the path of least resistance.
- Best for
- Microsoft 365 organisations that want one vendor and one bill.
- Hosting model
- Microsoft cloud only — there is no self-hosted edition.
- Honest caveat
- You inherit the whole ecosystem: licensing tiers, admin complexity and tight coupling to Microsoft services.
- 07(07)
Twist
Deliberately calm, async-first messaging
Twist, made by Doist, is the calm outlier: threads-first and deliberately asynchronous, designed so nobody feels forced to be online. There is no presence light pressuring you to reply now.
- Best for
- Small remote teams that want slower, more thoughtful communication by design.
- Hosting model
- SaaS only.
- Honest caveat
- No self-hosting and no built-in video calls — real-time collaboration is intentionally out of scope.
Where Polybase wins — and where we don't win yet.
You are reading this list on our site, so here is the part vendors usually skip.
- One workspace, not a stackChat, calls, tasks, docs, email and automation share one data layer — a message becomes a tracked task without an integration in between.
- Deployment freedomEU-region cloud, your own VPC, or air-gapped self-host. It runs fully offline; calls use a self-hosted LiveKit server.
- Sovereignty by architectureSelf-hosting means your servers and your keys. The reach of the US CLOUD Act ends where your own infrastructure begins.
- Plain pricingCore is €10 per user/month, with optional add-ons — instead of a chat bill plus a task-tool bill plus a docs bill.
- AI on your termsBring your own model — Anthropic, OpenAI, Gemini or self-hosted via Ollama. Your content isn't used to train foundation models.
- CertificationsNot certified yet — SOC 2 and ISO 27001 are on our roadmap. We answer security questionnaires and architecture questions today.
- Enterprise sign-onSSO/SAML/SCIM are on the roadmap; today sign-in is email/password and magic links.
- Ecosystem sizeNo app marketplace and no guided importers yet — we offer a REST API, an MCP server, GitHub and HubSpot connectors, and migration assistance during onboarding.
- Native appsDesktop and mobile apps are available. You can also use the web app or installable PWA.
Choosing a Slack alternative.
It depends on your binding constraint. Need self-hosting: Mattermost, Rocket.Chat or Polybase. Want an open protocol with federation: Element on Matrix. Async-first culture: Zulip or Twist. Consolidating chat plus tasks, docs and calls into one workspace: that is the case Polybase is built for — we're biased, so read the side-by-side comparison too.
Mattermost, Rocket.Chat, Zulip and Element all have open-source editions you can self-host. Polybase is not open source, but it can be fully self-hosted, including air-gapped deployments.
Slack lets workspace admins export data, and most alternatives can work from that archive. Polybase offers migration assistance during onboarding; automated importers are on our roadmap. Many teams simply keep the export as a read-only archive and start clean.
Polybase is designed around GDPR principles, with configurable role-based access control and self-hosting for full data control. SOC 2 and ISO 27001 are on the roadmap, not held yet — we answer security questionnaires and architecture questions today.
Polybase Core is €10 per user/month — chat, tasks, drive, calls and automation — with optional add-ons such as Boards, Email, Tables and AI. Whether that beats your Slack bill depends on how many satellite tools it lets you retire; a demo walks through your actual stack.
See Polybase next to Slack, feature by feature.
Book a 30-minute demo and we'll map your current stack onto one workspace — or start with the detailed side-by-side comparison.
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