Best Mattermost Alternatives in 2026: 13 Self-Hosted and Cloud Chat Tools

Updated August 2026

The best Mattermost alternatives in 2026 split into two real categories: self-hosted tools for teams that need air-gapped or on-premise control (Rocket.Chat, Zulip, Element, Nextcloud Talk, Wire), and cloud tools for teams that just want the IT lift gone (Slack, Microsoft Teams, Google Chat, Zoho Cliq, Pumble, Discord, Twist), plus Rework for teams consolidating chat with a broader ops platform. All 13 are evaluated on deployment model, licensing, and pricing verified directly from each vendor's own site in August 2026.

If you're searching for Mattermost alternatives, you're probably not a generic chat shopper. You're the person who got told to evaluate self-hosting, air-gapped deployment, or a specific compliance requirement, or you hit one of Mattermost's real friction points: the free Entry edition's server-wide caps, Team Edition's missing SSO, the IT lift of running your own instance, or the fact that Mattermost no longer publishes a price for any paid tier, which means budgeting starts with a sales call. This guide treats those two readers differently instead of pretending a self-hostable open-source tool and a managed cloud SaaS are interchangeable just because they both have channels and threads. For the buyer-research process behind a decision like this, how to choose team chat software walks through the evaluation criteria in more depth than a single roundup can.

Key Facts

• Enterprise open source software is important to the overall infrastructure strategy of 95% of IT leaders, per Red Hat's State of Enterprise Open Source report.
• 61% of Western European CIOs and IT leaders say geopolitics will push them toward local or regional cloud providers, and 55% plan to expand their use of open-source software, per a Gartner survey reported by Computerworld.
• Gartner forecasts that by 2030, more than 75% of enterprises outside the US will have a digital sovereignty strategy built on local or regional cloud usage, per the same Computerworld coverage of the Gartner survey.
• The average healthcare data breach cost $7.42 million in 2025, the most expensive of any industry for the 14th year running, per IBM's Cost of a Data Breach Report as summarized by HIPAA Journal.

Quick Comparison Table

Self-Hosting and Deployment Matrix

This is the table most Mattermost searchers actually need. "Self-hosted" and "open source" are not the same claim, and neither guarantees SSO on the free tier.

Stage Fit Matrix

Sizing and Persona Table

1. Rocket.Chat: Open Source With Full Control, If You Have the DevOps to Run It

Rocket.Chat is the most direct open-source competitor to Mattermost, and it carries the same famous-free-tier trap. Community edition is free, open source (MIT), and self-hosted, with no user cap. The Starter plan is also free and includes premium features (AD/LDAP, SSO, MFA, RBAC, E2E encryption, retention, DLP, moderation), but it's capped at 50 users. Exceed 50 and, per Rocket.Chat's own plan documentation, the workspace is restricted from adding new users while existing users and data remain accessible. Beyond that, Commercial, Government, and Defense plans are all "Get pricing," with no published number.

For teams that already run Mattermost self-hosted, Rocket.Chat is the closest lateral move: omnichannel routing (so customer-facing chat and internal messaging live in the same system), a marketplace of extensions, and REST APIs for custom integrations. See Mattermost vs Rocket.Chat for a direct feature-by-feature breakdown if these two are your actual shortlist.

The tradeoff is the same one every self-hosted tool on this list shares: someone has to patch, back up, and scale the server. If you don't have that capacity, the free tiers stop being free the moment you count engineering hours.

Pricing: Community and Starter are free (Starter capped at 50 users); Commercial, Government, and Defense plans have no published price.

Best for: Security-conscious mid-size teams (20-500) with in-house DevOps that need self-hosted messaging with full data control.

2. Zulip: Topic-Threaded Chat Built for Technical Teams

Zulip's core difference from Mattermost isn't deployment, it's the messaging model. Every message belongs to a topic within a channel, not a flat stream of messages you have to scroll to find context in. For engineering teams juggling a dozen parallel conversations, that structure keeps discussions searchable months later in a way flat channels don't.

Zulip is also the cleanest answer to the SSO gap that trips people up in Mattermost's Team Edition. SAML authentication ships on every self-hosted Zulip installation, including the free self-hosted tier, with no plan upgrade required. That's a real distinction: Mattermost's free Entry edition includes SSO, but Team Edition (the uncapped-history free tier) does not. Zulip doesn't force that tradeoff. Cloud Zulip is a separate product line; Cloud Free caps at 10,000 messages of searchable history, and Cloud SAML requires the Cloud Plus plan.

Pricing: Self-hosted Free (unlimited, open source); self-hosted Basic $3.50/user/month; self-hosted Business $6.67/user/month annual or $8 monthly (25-user minimum). Cloud Free (10,000-message history); Cloud Standard $6.67/user/month annual or $8 monthly; Cloud Plus $10/user/month annual or $12 monthly (10-user minimum).

Best for: Engineering and technical teams (10-500) that want topic-based threading and need SSO without paying for a higher tier.

3. Element (Matrix): Federated, Sovereignty-First Messaging

Element is the one tool on this list built on an open, federated protocol rather than a single vendor's server. Matrix lets different organizations run their own homeservers and still message each other directly, the way email works across providers, instead of requiring everyone to be on the same platform. For agencies, consultancies, or government bodies that regularly need to talk across organizational boundaries without funneling everything through one company's cloud, that architecture is the actual point.

Like Mattermost and Rocket.Chat, Element has stopped publishing per-seat prices. Element Server Suite Community is free, open source (AGPLv3), and self-hosted, with basic SSO available through the bundled Matrix Authentication Service. Element Enterprise is "priced per seat/month" starting from 100 users, and Element Sovereign is "priced per deployment," both confirmed as contact-sales only on element.io/pricing. Advanced identity management, autoscaling, and audit tooling sit behind the paid Enterprise tier (ESS Pro), not Community.

Pricing: Community is free, self-hosted, open source. Enterprise and Sovereign have no published price; Enterprise starts from 100 seats.

Best for: Government, defense, and healthcare organizations (20-1,000) that need decentralized, self-hosted, end-to-end encrypted messaging with cross-organization federation.

4. Slack: The Market Leader, If You Don't Actually Need Self-Hosting

Not every Mattermost search ends in self-hosting. Some readers hit Mattermost's IT lift, decided it wasn't worth it, and want to know what a fully-managed cloud tool costs instead. Slack is the honest answer to that version of the question: the biggest integration library in the category (2,600+ apps), a workflow builder, and a UX that most people already know how to use.

The free tier caps message history at 90 days and limits you to 10 app integrations, which is the opposite problem from Mattermost's unlimited-but-unmanaged self-hosted history. Pro runs $7.25 per user per month billed annually, or $8.75 monthly (with a promotional $4.38 rate for the first three months). Business+ is $15 per user per month annually, or $18 monthly. There's no self-hosted option at any tier. See best Slack alternatives if Slack's own pricing and channel sprawl are the actual complaint driving your search.

Pricing: Free (90-day history, 10 apps); Pro $7.25/user/month annual or $8.75 monthly; Business+ $15/user/month annual or $18 monthly; Enterprise+ contact sales.

Best for: Teams that want the biggest integration library and don't have a self-hosting or air-gapping requirement.

5. Microsoft Teams: Enterprise Compliance for the Microsoft 365 Stack

Teams isn't competing with Mattermost on deployment model at all, it's a cloud-only product that wins on a different axis: if your organization already pays for Microsoft 365, Teams is effectively bundled in. For regulated industries that need eDiscovery, DLP policies, and Entra ID-based identity without standing up their own infrastructure, that's a credible alternative to running Mattermost yourself.

The free consumer Teams app (60-minute group calls, up to 100 participants, 5 GB storage) isn't the business product. Teams Essentials starts at $4 per user per month, paid yearly. Microsoft 365 Business Basic, which bundles Teams, runs $7 per user per month yearly. Business Standard with Copilot is $23.50 per user per month yearly, and Business Premium with Copilot is $32. None of these are self-hosted, and Microsoft doesn't offer an air-gapped on-premise version the way Skype for Business once did. For a side-by-side against Google's equivalent, best Microsoft Teams alternatives and Slack vs Microsoft Teams cover the comparison from the other direction.

Pricing: Teams Essentials $4/user/month, paid yearly; M365 Business Basic $7/user/month yearly; Business Standard with Copilot $23.50/user/month yearly; Business Premium with Copilot $32/user/month yearly.

Best for: Mid-market and enterprise orgs already inside the Microsoft 365 stack that need compliance tooling without running their own servers.

6. Rework: Chat Built Into CRM and Ops Workflows, Not a Standalone Messenger

Most tools on this list are answering the same question Mattermost answers: how do we run our own chat server, or find a managed replacement for one. Rework is answering a different question entirely, which is why it sits at the middle of this list rather than the top. If chat is the whole problem, Rework isn't the fix. If the actual complaint was cost or IT overhead rather than sovereignty, and the team also juggles a CRM, task boards, and approval workflows in separate tools, Rework's argument is consolidation: chat sits next to the CRM record, the task, and the workflow it's actually about, instead of in a separate app someone has to tab over to.

Rework's live chat-adjacent modules are Chat (internal work chat), Exchange (chat across companies), Townhall (company-wide announcements and comms), Square (internal Q&A), plus Meeting, Booking, and Schedule. Video Call and Mail are not live products, so don't expect Rework to replace a video conferencing tool or business email today.

Be clear about who this isn't for. Most people reading a Mattermost-alternatives article want self-hosting, and Rework has no self-hosted, air-gapped, or on-premise deployment option, and no federation. If data sovereignty or a compliance-driven private deployment is the actual requirement, Rework is the wrong tool; look at Rocket.Chat, Element, or Nextcloud Talk instead. Rework also isn't built for solo operators or 2-3 person teams; the realistic fit starts around 10 people and tops out around 200.

Pricing: Quote on request (rework.com/pricing). Rework sells packages rather than per-user licenses across its priced product lines, but the Chat module itself carries no published number, so budgeting starts with a sales conversation, similar to where Mattermost's own paid tiers land you.

Best for: Mid-size teams (10-200 people) whose real complaint about Mattermost was cost or IT lift, not sovereignty, and who want chat living next to CRM and workflow records instead of in a separate app.

7. Nextcloud Talk: Self-Hosted Chat Inside a Full Open-Source Workspace

Nextcloud Talk is the chat layer of a much bigger self-hosted product: file sync and sharing, calendar, contacts, and collaborative docs, all under one AGPL-licensed, open-source umbrella. If your team's actual goal is replacing several SaaS subscriptions with one self-hosted stack, not just replacing Mattermost specifically, Talk is worth evaluating as part of the whole Nextcloud server rather than in isolation. For a look at what else gets replaced in that kind of consolidation, best Dropbox alternatives covers the file-sync side of the same decision.

The core server, Talk included, is free and open source when self-hosted; you provide the infrastructure. Nextcloud's Enterprise pricing is published in euros: Talk standalone runs EUR 42 per user per year starting at 100 users, while Files Standard (which includes Talk) runs EUR 71.29, Files Premium EUR 104.99, and Files Ultimate EUR 204.75 per user per year at the 100-user tier, with lower per-user rates at 200 users and above.

Pricing: Free, open source, self-hosted (core server). Enterprise Talk standalone from EUR 42/user/year at 100 users; bundled into Files Standard (EUR 71.29), Premium (EUR 104.99), or Ultimate (EUR 204.75) per user per year at 100 users, lower at 200+.

Best for: IT teams (20-500) consolidating file storage, docs, and chat into one self-hosted, open-source workspace rather than running point solutions.

8. Wire: End-to-End Encrypted at Every Deployment Tier

Wire's pitch is that end-to-end encryption isn't a paid add-on, it's the default across text, voice, and video on every plan, including the free one. That's a meaningfully different security posture than tools where E2EE is an Enterprise-only checkbox. Wire for Free covers up to 5 people and 8 devices. Wire for SMB runs EUR 7.45 per person per month billed annually, or EUR 8.94 monthly, for up to 100 people; Wire publishes these figures in euros, so quote them that way rather than converting informally.

Where Wire earns a spot on a Mattermost-alternatives list specifically is deployment flexibility at the Enterprise tier: on-premise, private cloud, and fully air-gapped backend deployment are all supported options for Enterprise customers, alongside SSO and SCIM provisioning, which the SMB tier doesn't include. That makes Wire one of the few tools here that scales from "5 people, free, cloud" all the way to "custom air-gapped deployment for a defense contractor" without switching products.

Pricing: Free (up to 5 people, 8 devices); Wire for SMB EUR 7.45/person/month annual or EUR 8.94 monthly (up to 100 people); Wire for Enterprise custom-quoted (100+ people, on-prem and air-gapped options).

Best for: Enterprises and NGOs (20-1,000) that need end-to-end encryption guaranteed at every tier and the option to move to on-premise or air-gapped deployment without a platform change.

9. Zoho Cliq: Budget Chat for Teams Already Inside Zoho

Zoho Cliq's most useful trait for this list is one most budget chat tools skip: SAML-based SSO is included starting on the Free plan, not gated behind Professional or Enterprise. That puts Cliq in an unusual spot; it undercuts Slack and Teams on price while matching Mattermost's own Entry-edition SSO story, minus the self-hosting.

The free tier supports up to 100 participants per group chat, 10,000 searchable messages, and 100 GB of file storage per organization, though it excludes call recording and external channels. Pricing gets a little unusual past that: Standard is a flat $16.20 per month for up to 25 users rather than a per-seat rate, which is a fine deal at 25 people and an awkward one right past it. Professional runs $1.80 per user per month with a 10-user minimum, and Enterprise is $3.60 per user per month, also with a 10-user minimum; yearly billing saves 10% on either.

Pricing: Free (100 participants/chat, 10,000 messages, 100 GB storage); Standard $16.20/month flat (up to 25 users); Professional $1.80/user/month (10-user minimum); Enterprise $3.60/user/month (10-user minimum); yearly billing saves 10%.

Best for: Small-to-mid teams (5-250) already using Zoho apps that want SSO without paying Enterprise-tier prices.

10. Pumble: Unlimited Free History, No Self-Hosting

Pumble solves the one thing that frustrates free-tier chat users across this whole category: unlimited message history and unlimited users, at no cost, with 10 GB of file storage per workspace. There's no 90-day cliff like Slack's, and no server-wide message cap like Mattermost Entry's. The tradeoff is that Pumble has no self-hosted option at all; everything runs on Pumble's cloud.

Paid plans stay cheap: Pro is $2.49 per seat per month billed annually, or $2.99 monthly. Business runs $3.99 annual or $4.99 monthly, and Enterprise is $6.99 annual or $7.99 monthly. Pumble is also sold as part of a CAKE.com bundle with Clockify and Plaky at $12.99 annual or $15.99 monthly, if project tracking is also on your list.

Pricing: Free (unlimited users and message history); Pro $2.49/seat/month annual or $2.99 monthly; Business $3.99 annual or $4.99 monthly; Enterprise $6.99 annual or $7.99 monthly.

Best for: Budget-conscious teams (2-200) that want unlimited free history without any self-hosting responsibility.

11. Discord: Free Voice Channels for Dev Teams, Not an Enterprise Tool

Discord earns a place here for a narrow reason: developer and startup teams sometimes land on a Mattermost-vs-Discord decision when the real requirement was never compliance at all, just free persistent voice channels and unlimited message history. Discord's free tier delivers both, plus a mature bot and community ecosystem that outclasses anything in the self-hosted chat category.

What Discord doesn't have is any of the reasons most people search "Mattermost alternatives" in the first place: no SSO, no SCIM provisioning, no DLP, and no self-hosting. If your organization has a security review, a legal hold policy, or any regulated data handling requirement, Discord fails that review by design, not by oversight.

Pricing: Free for most teams; Nitro Basic $2.99/month and Nitro $9.99/month are personal subscriptions, not business seat licenses.

Best for: Early-stage startups and developer teams (2-100) where free voice channels and culture fit matter more than compliance.

12. Google Chat: Native Chat for Google Workspace Teams

Google Chat's case is simple: if your company already runs on Google Workspace, Chat is already there, with Spaces for topic-based channels, one-click Meet integration, and native Docs and Drive previews. It's not trying to be a Mattermost replacement so much as removing the need to evaluate one if you're Google-native already. For teams weighing the wider Workspace stack rather than just chat, best Google Workspace alternatives covers what's worth replacing versus keeping.

There's no standalone free tier; Chat comes bundled starting with Business Starter at $7 per user per month, discounted to $3.50 for the first 12 months, with 30 GB of pooled storage per person. Business Standard runs $14 (discounted to $8.40 for year one) with 2 TB, and Business Plus is $22 with 5 TB. Starter, Standard, and Plus all cap at 300 users; Enterprise is quote-only. None of it is self-hosted.

Pricing: Business Starter $7/user/month (promo $3.50 for 12 months); Business Standard $14/user/month (promo $8.40); Business Plus $22/user/month; Enterprise contact sales. Starter/Standard/Plus cap at 300 users.

Best for: Google Workspace organizations (10-1,000) that want chat included in their existing subscription rather than adding another vendor.

13. Twist: Async-Only Threads for Distributed Teams

Twist's thesis is the opposite of Mattermost's default assumption: real-time chat is the wrong shape for most work. Every conversation in Twist is a thread, not a live stream, and nothing carries an expectation of an immediate reply. For fully distributed, timezone-spread teams that have deliberately adopted async-first culture, that design choice removes a category of notification noise that persists in any real-time tool, self-hosted or not. Distributed teams and time zones and the async communication guide cover when that tradeoff actually pays off versus when it just adds friction.

The free plan keeps 1 month of comment and message history, up to 5 integrations, and 5 GB of file storage. Unlimited is $6 per user per month; Twist's own pricing page doesn't publish a separate annual rate, so there isn't a discount to quote here.

Pricing: Free (1-month history, 5 integrations, 5 GB storage); Unlimited $6/user/month (no separate annual rate published).

Best for: Fully distributed, async-first teams (5-150) that have already decided real-time chat isn't their operating model.

Why Teams Leave Mattermost: The Specific Pain Points

One factor that's easy to underweight: switching cost. The sticker price is simple to compare; the real cost is migration, exporting message history, rebuilding webhooks and bot integrations, and retraining the team. Self-hosted-to-self-hosted moves (Mattermost to Rocket.Chat or Zulip) generally carry supported import tooling. Self-hosted-to-cloud moves (Mattermost to Slack or Teams) usually mean a clean cutover date instead of a full history migration.

Pricing Comparison Table

How to Choose: Decision Framework

What to Do Next

Pick your top two candidates and run a two-week pilot with one real team, not a demo environment. If self-hosting or air-gapping is the actual requirement, stand up Rocket.Chat or Zulip on real infrastructure with real IT ownership assigned before you commit; the free tier's true cost only shows up once someone has to patch it at 2 a.m. If the requirement was cost or IT overhead rather than sovereignty, run the same pilot against a managed option, Slack, Teams, or Rework if your team also wants chat living next to its CRM and workflow records, and compare total effort, not just the sticker price.