13 Best Slack Alternatives for Team Communication

Thirteen team communication platforms worth considering instead of Slack, covering free unlimited-history chat, self-hosted and open-source options, async-first messaging, and tools already bundled into the software your team pays for.

Slack popularized the modern team chat format, but it isn't the only reasonable choice, and for some teams it isn't even the cheapest or most fitting one. Common reasons teams look elsewhere: message history limits on the free plan, per-user pricing that scales awkwardly for larger teams, a preference for self-hosted data control, or simply a workflow that real-time chat streams don't suit well.

This list groups 13 named platforms by the specific gap they fill, rather than ranking them on a single scale — the right alternative depends heavily on whether you're optimizing for cost, data ownership, async focus, or avoiding a new subscription altogether.

How These Were Chosen

Every platform below is a genuinely distinct, individually named product with its own pricing and positioning — not a feature bundled inside another tool's marketing page. Selection favored platforms with a clear, differentiated reason to choose them over Slack, rather than ones that simply clone Slack's interface without addressing any of its actual limitations.

Pricing for software subscriptions changes often and varies by billing term, seat count, and region. The figures below reflect research as of the current date and are noted as such — confirm current pricing directly with each vendor before budgeting.

Already-Bundled Options

1. Microsoft Teams

Included in every Microsoft 365 business plan, which makes it the default choice for organizations already paying for that suite. It combines chat, video calls, and file collaboration tied directly into Word, Excel, and SharePoint. The tradeoff for many users is a less streamlined chat experience than Slack's — channels and threading can feel more cluttered, and the interface leans toward meetings and calls as much as messaging. Best for: organizations already committed to the Microsoft 365 ecosystem, where Teams effectively costs nothing extra.

2. Google Chat

Included in every Google Workspace plan, with the same logic as Teams: if you're already paying for Gmail, Drive, and Docs, Chat is available at no additional cost. Integration with Google Meet for video and Google Drive for file sharing creates a reasonably cohesive workflow for Workspace-first teams, though its feature set and third-party app ecosystem are noticeably thinner than Slack's. Best for: Workspace-native teams who want messaging without a separate subscription.

3. Zoho Cliq

Part of the broader Zoho suite, with a functional free tier (unlimited users on Zoho's own description) and low-cost paid plans that scale up with more storage, admin controls, and integration depth. Third-party pricing aggregators show some inconsistency in exact current figures for Zoho Cliq's paid tiers, so confirm pricing directly on Zoho's site before committing. It supports channels, threaded messaging, and audio/video calls for up to 100 participants. Best for: teams already using other Zoho products (Zoho CRM, Zoho Projects) who want messaging in the same ecosystem, or budget-conscious teams wanting a generous free tier.

Free and Budget-Friendly

4. Discord

Originally built for gaming communities, Discord has become a legitimate team communication option for startups, creative teams, and online communities that want free voice channels, screen sharing, and text chat without per-user licensing costs. Its free tier has no meaningful message history limit, which directly addresses one of Slack's most common free-plan complaints. The interface and terminology (servers, channels) can feel unfamiliar to teams expecting a traditional business-software layout, and it lacks some enterprise compliance features larger organizations require. Best for: startups, creative teams, and online communities prioritizing cost and voice-first communication.

5. Pumble

Offers unlimited message history and unlimited users on its free plan, which is the single clearest answer to Slack's free-tier message-retention limit. The interface intentionally mirrors familiar team-chat conventions (channels, threads, direct messages), which keeps the learning curve low for teams migrating from Slack. Paid tiers add larger group video calls, more storage, and admin controls. Best for: teams that want an unlimited free plan without the visual overhaul of switching to Discord.

6. Chanty

Also offers unlimited message history on its free plan, though the free tier caps out at 5 users, making it better suited to small teams and freelancers than larger organizations. Chanty includes built-in task management (a "Teambook" view) alongside chat, which can reduce the need for a separate lightweight project tool. Best for: small teams and freelancers who want simple chat plus basic task tracking in one place.

7. Flock

Positions itself as one of the closer UI matches to Slack among paid alternatives — channels, direct messages, threads, and a similar notification model — which minimizes the relearning curve for teams migrating over. As of recent pricing, Flock starts at roughly $4.50 per user per month, noticeably below Slack's standard paid tier. Its integration library is smaller than Slack's, covering common business tools but not the long tail of niche integrations Slack supports. Best for: teams wanting a near-identical Slack experience at a lower price point.

Self-Hosted and Open Source

8. Mattermost

An open-source platform whose interface closely resembles Slack's — channels, direct messages, threads, integrations — which keeps migration friction low. A free, self-hosted Community edition handles smaller teams; paid Professional and Enterprise tiers (roughly $10/user/month for Professional, as referenced in current comparisons, with Enterprise custom-priced) add compliance features, high-availability configuration, and enterprise support. Best for: organizations with strict data privacy or compliance requirements — government, healthcare, and regulated industries — that want full control over where their communication data lives.

9. Rocket.Chat

Similar in positioning to Mattermost: fully open source, self-hostable, and built for teams that need complete data ownership. The free Community edition is self-hosted; a cloud-hosted Enterprise plan starts around $7 per user per month for premium features, based on recent vendor pricing. The open codebase allows deep customization through plugins and APIs, though realizing that flexibility requires IT resources most small teams don't have on hand. Best for: IT teams and organizations that need self-hosting specifically for compliance or security reasons, and have the technical capacity to maintain it.

A Different Philosophy

10. Twist

Built by Doist (the makers of Todoist) on an explicitly different premise than Slack: it rejects real-time chat streams in favor of threaded, topic-organized async communication, closer to structured email than a live chat feed. There's no typing indicator, no pressure to respond instantly, and conversations are organized by topic rather than a continuously scrolling channel. This is a genuine philosophical mismatch for teams that rely on fast back-and-forth, but a strong fit for distributed teams working across time zones who want to reduce notification pressure. Best for: async-first, distributed teams that want fewer interruptions and more organized, searchable discussion threads.

11. Ryver

Combines team chat, task management, and voice/video calls into a single platform, targeting teams that want fewer separate tools rather than a pure chat replacement. Ryver has changed ownership in recent years (following an acquisition), and update cadence has reportedly slowed since — worth factoring in if long-term product investment matters to your decision. Best for: small teams wanting chat and lightweight task management combined, with the caveat of checking current development activity before committing long-term.

12. Basecamp

Not a direct chat clone at all — Basecamp is a project management platform with a built-in group-chat feature (Campfire) rather than a messaging-first tool. Teams that find themselves drowning in scattered Slack channels sometimes move communication into Basecamp specifically because it ties conversation to actual project structure (to-do lists, files, schedules) rather than free-floating channels. It charges a flat fee for the whole organization rather than per-user pricing on its main plan, which can make it notably cheaper for larger teams — confirm current plan structure directly with Basecamp, since flat-fee software pricing shifts periodically. Best for: teams whose real problem is that chat and project work live in separate tools, not teams that specifically want a faster or cheaper chat app.

Built for Deskless Teams

13. Connecteam

Solves a different problem than most tools on this list: team communication for people who don't sit at a desk — retail staff, construction crews, field service teams, hospitality workers. The mobile-first app combines chat with employee scheduling, time tracking, and training modules, addressing needs that a pure chat tool like Slack was never designed for. For office-based knowledge workers, its scheduling and time-tracking features are unnecessary overhead rather than a benefit. Best for: businesses with frontline or deskless employees who need messaging bundled with scheduling and operational tools, not knowledge-worker teams.

Quick Comparison

If You Need X, Consider Y

Common Mistakes When Choosing a Slack Alternative

Picking based on interface similarity alone. Mattermost, Rocket.Chat, and Flock all closely resemble Slack visually, which lowers the learning curve — but interface similarity says nothing about whether the underlying philosophy (self-hosted vs. cloud, sync vs. async) actually fits how your team works.

Ignoring the free-tier fine print. "Unlimited message history" and "unlimited users" are two different claims — Chanty offers the former but caps users at 5 on its free plan, while Pumble offers both. Read the specific limits rather than assuming "free" means the same thing across tools.

Treating self-hosting as free. Mattermost's and Rocket.Chat's self-hosted community editions have no license fee, but running your own server, applying security patches, and maintaining uptime is real, ongoing work — the right choice depends on whether your organization actually has the IT capacity to take that on, not just whether the license itself costs money.

Assuming every team needs real-time chat at all. Twist's entire premise is that constant real-time messaging creates unnecessary interruption for teams that don't need instant responses. Whether that's a feature or a dealbreaker depends entirely on how your specific team actually works — there's no universally correct answer here.

FAQs

Is there a truly free Slack alternative with no user limit? 

Pumble and Discord both offer unlimited users and unlimited message history on their free plans, which directly addresses Slack's free-tier message-history cap. Neither is a feature-for-feature Slack clone, so confirm the specific integrations and admin controls you need are present before switching.

Which Slack alternative is best for a company already using Microsoft 365 or Google Workspace? 

Microsoft Teams or Google Chat, respectively, since both are included in those subscriptions at no additional cost. The main tradeoff is a generally less polished, chat-focused experience compared with Slack or a dedicated alternative.

What's the best self-hosted Slack alternative? 

Mattermost and Rocket.Chat are the two most established open-source, self-hostable options. Mattermost is generally considered more polished out of the box; Rocket.Chat offers deeper customization through its plugin ecosystem, at the cost of requiring more setup effort.

Is Microsoft Teams actually a good replacement for Slack, or just a cheaper one? 

It depends on what you value. Teams bundles chat with video, calls, and Microsoft 365 file collaboration at no extra cost for existing subscribers, which is a real cost advantage — but many users find its chat-specific experience less refined than Slack's or a dedicated chat tool's.

Can I migrate my Slack message history to another platform? 

Migration support varies significantly by platform and by which Slack plan you're exporting from — Slack's own export tools have different capabilities depending on your subscription tier. Check each target platform's documentation for its specific Slack-import process before migrating, since automated history import isn't universally supported.

Are open-source alternatives like Mattermost and Rocket.Chat actually more secure than Slack? 

Self-hosting shifts responsibility for security, not automatically improves it — a self-hosted instance is only as secure as the team maintaining it. For organizations with strong in-house security practices and compliance needs, self-hosting offers more control; for teams without dedicated IT resources, a well-maintained cloud platform may in practice be more consistently secure.

Is Discord appropriate for a professional business team, or just for gaming communities? 

It's become a legitimate option for startups and creative teams, particularly ones that value voice channels and want to avoid per-user licensing fees. It generally lacks some enterprise compliance and admin features that larger, more regulated organizations require, so it's a better fit for smaller, less formal teams than for enterprise deployments.