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People leave Slack for a handful of reasons. The price after a team grows. The message history wall on the free tier. A Microsoft 365 contract that includes Teams. An IT department that made the decision for them.
Whatever brought you here — here’s an honest rundown of what’s actually worth trying.
Not every tool on this list is better than Slack for everyone. Some are better for specific team sizes. Some are better for specific industries. Some are just cheaper. I’ll tell you which is which.
The Short List
| Tool | Best For | Starting Price | Free Tier |
|---|---|---|---|
| Microsoft Teams | M365 organizations | $4/user/mo (Essentials) | Yes (limited) |
| Google Chat | Google Workspace orgs | Included in Workspace | Yes (with Google account) |
| Discord | Small teams, informal culture | Free | Yes (generous) |
| Mattermost | Self-hosted/data-sovereign | Free (self-hosted) | Yes (Community edition) |
| Pumble | Budget-conscious teams | $2.49/user/mo | Yes |
| Twist | Async-first teams | $5/user/mo | Yes (limited) |
| Rocket.Chat | Customization / self-hosted | Free (self-hosted) | Yes |
1. Microsoft Teams — Best Slack Alternative for M365 Organizations
If your company pays for Microsoft 365 Business Basic ($6/user/mo) or higher, Teams is already in your subscription.
That’s the whole pitch, honestly. You’re paying for it. It does most of what Slack does. Switching won’t cost extra.
Teams has improved significantly since its rough 2017–2020 years. The meeting experience is legitimately good — better than Slack’s for large calls. Integration with Outlook, SharePoint, and OneDrive is seamless. File storage is 1TB per user (compared to Slack’s 10GB on paid plans). The compliance and admin features are mature.
What Teams still doesn’t do as well as Slack: the UI is cluttered and less intuitive. Search is inconsistent. Third-party integrations are fewer (700+ vs. Slack’s 2,600+). Developer API is capable but less elegant.
If you’re evaluating from scratch and Teams vs. Slack is genuinely open, see our full Slack vs Microsoft Teams 2026 breakdown.
Bottom line: Default choice if you’re on M365. Genuine competitor otherwise — just accept the UX learning curve.
2. Google Chat — Best for Google Workspace Teams
Same logic as Teams. If your organization pays for Google Workspace (starting at $6/user/mo), Google Chat is included.
Google Chat has been through multiple awkward identity crises over the years — it used to be called Hangouts, then Google Meets, then… various things. The current product (Google Chat, part of Google Workspace) is actually decent. Spaces (the channel equivalent) work well. Integration with Gmail, Docs, Drive, and Calendar is natural.
Where it falls short: third-party integrations are weaker than Slack and Teams. The notification system is basic. Chat’s threading model (it uses Spaces + threads) takes adjustment for teams coming from Slack’s channel-based paradigm. Bots and automation are possible but less developed than Slack.
For teams that already work almost entirely within Google’s ecosystem — Docs, Sheets, Gmail, Calendar — Chat is a logical complement and you’re already paying for it.
For teams with diverse tool stacks: Slack probably serves you better, but check the price math first.
Bottom line: Right choice for Workspace organizations. Not worth switching to if you’re not in Google’s ecosystem.
3. Discord — Surprisingly Functional for Small Teams
I know. I know. But hear me out.
Discord started as a gaming chat platform and spent years being the place where communities and friend groups hung out. It also turns out that the feature set — voice channels, text channels, role permissions, screen sharing, video calls — maps remarkably well onto small team communication.
The free tier is genuinely generous: unlimited message history, unlimited file sharing (up to 8MB per file), unlimited voice channels, and up to 10MB video quality. No 90-day message cliff like Slack’s free tier.
Discord Nitro ($9.99/month, per user, not per organization) adds higher upload limits and better video quality, but it’s optional. Many small teams use Discord indefinitely on the free tier.
The real limitations:
- It looks and feels like a gaming app, which affects perception with clients, external partners, and executives who open it for the first time expecting Teams
- No real admin controls or compliance features
- Guest access (External users joining your server) works but isn’t designed for external collaboration workflows
- No enterprise features (SSO, data export, retention policies)
For a small software startup, creative agency under 15 people, or a remote-first team that works casually: Discord is a legitimate free option that’s genuinely fun to use. For anyone who needs to onboard enterprise clients or has IT governance requirements: look elsewhere.
Bottom line: Best free option for small, informal teams. Not appropriate for regulated industries or enterprise use.
4. Mattermost — Best for Self-Hosted and Data-Sovereign Teams
Mattermost is the answer to “we like Slack but we need to control where our data lives.”
The Community Edition is free and open source — you run it on your own infrastructure. The feature set is comparable to Slack: channels, threads, direct messages, integrations, bots, and slash commands. The interface is Slack-like enough that the transition isn’t jarring.
Mattermost also offers a cloud-hosted option if you want the product without the infrastructure overhead. The Professional plan starts at $10/user/mo, which is pricier than Slack — but that price includes compliance features that would cost significantly more in enterprise Slack tiers.
Who uses Mattermost: government contractors, healthcare organizations, financial institutions, any team that can’t send data to a third-party SaaS. Also: security-conscious engineering teams that want to avoid vendor lock-in.
The self-hosted path has real costs. You need server infrastructure, someone to maintain it, and ongoing responsibility for backups and uptime. Don’t underestimate the operational overhead.
Bottom line: Best Slack alternative for data sovereignty and compliance requirements. Self-hosting requires real IT resources.
5. Pumble — Best Budget Slack Alternative
Pumble is a Slack clone that doesn’t hide what it is. The UI looks like Slack. The channel structure works like Slack. The notifications work like Slack. The price is significantly lower: $2.49/user/month for the Pro tier (vs. Slack’s $7.25).
The free tier includes unlimited message history — which is the single biggest limitation of Slack’s free tier, and Pumble eliminates it entirely.
What you give up: fewer integrations, a smaller community, less polished mobile apps, and no brand recognition (which matters if you need to explain your tool stack to clients or partners).
For teams where the primary goal is “something that works like Slack but costs less,” Pumble is the honest answer. It won’t impress anyone, but it’ll get the job done.
Bottom line: Best pure-price alternative for teams that want Slack-like UX on a tight budget.
6. Twist — Best for Async-First Teams
Twist is a different philosophy, not just a different product.
Where Slack is designed around real-time chat — constant channels, instant notifications, the pressure to respond now — Twist is designed around threads that have context and don’t disappear in a stream of messages. Every conversation in Twist is a thread with a subject, a bit like an email but more navigable.
If your team has remote workers in multiple time zones and you’re tired of important conversations getting buried in a channel’s scroll, Twist’s model forces more intentional communication. You post a thread about a topic. People respond when they get to it. The conversation stays organized and findable.
The cost: it’s a slower pace. Real-time, fast-moving conversations feel awkward in Twist’s model. For teams that do a lot of quick back-and-forth, the format is frustrating.
Pricing: $5/user/month. Not the cheapest, but less than Slack.
Bottom line: Worth considering for remote, async-first teams that want to move away from the always-on chat culture. Not a fit for teams that rely on fast back-and-forth.
7. Rocket.Chat — Best for Maximum Customization
Rocket.Chat is an open-source Slack alternative that you can self-host, heavily customize, and build on. If Mattermost is “self-hosted Slack,” Rocket.Chat is “self-hosted Slack where you also control the codebase.”
The integration possibilities are broader than Mattermost. The platform is more customizable out of the box. The community is active. But the out-of-box experience is rougher than Mattermost, and the self-hosted deployment is more complex to configure correctly.
Rocket.Chat also has a cloud-hosted option, but it’s not cheap — the Starter tier begins at $2/user/month but the features that matter require higher tiers.
For development teams that want to build custom communication tools on an open-source foundation: Rocket.Chat. For everyone else: Mattermost is simpler, Pumble is cheaper, Teams and Chat are already in your subscription.
How to Actually Choose
The decision tree is simpler than it looks:
- Do you use Microsoft 365? → Use Teams.
- Do you use Google Workspace? → Use Google Chat.
- Do you need self-hosted / data control? → Mattermost.
- Small team (under 15), informal culture, budget matters? → Discord or Pumble.
- Async-first, remote team across time zones? → Consider Twist.
- Want something very close to Slack at a lower price? → Pumble.
None of these are wrong answers if they fit your context. The “best” team communication tool is the one your team actually uses consistently.