Best Slack Alternatives for 2026 | AI Stack Guides
Best Slack alternatives for 2026
Slack's Pro plan moved from $7.25 to $8.75/user/mo in late 2025 and the Business+ tier is now $15/user/mo. For a 60-person company that's a $10,800/year bill, and the AI search add-on is another $10/user/mo on top. Plenty of teams that loved Slack in 2019 are now looking at the line item and asking why their tool of choice for chatting with coworkers costs more than their CRM. I've talked to 11 teams that left Slack in the last 8 months. The reasons cluster into three buckets: price, the 90-day message history limit on the free tier that finally forced them to upgrade, and the fact that the Salesforce acquisition didn't actually improve the product.
Here's what's worth migrating to and what's worth staying on Slack for.
Top alternatives worth your time
Microsoft Teams ($4 to $12.50/user/mo with Microsoft 365)
The obvious one. If you already pay for Microsoft 365 Business Standard at $12.50/user/mo, Teams is included. Better than Slack at video calls (full conferencing, not just huddle) and roughly tied on messaging. Worse than Slack at search and at third-party integrations.
Pick Microsoft Teams if: you're already on Microsoft 365, your org has more than 50 people, video calls matter more than the chat experience.
Google Chat (included with Google Workspace, $7.20 to $18/user/mo)
Spaces feature is now solid in 2026. Threading is better than the 2022 version. Strong if your org runs Google Workspace and you want one bill. Drawback: third-party app integrations are thin compared to Slack.
Pick Google Chat if: you live in Gmail and Google Docs, your team is under 30 people, you don't need 200+ integrations.
Discord (free for most teams)
Originally for gaming, increasingly used by startup teams, open source communities, and small agencies. Free for unlimited users and unlimited history. Voice channels are best-in-class. Drawback: not built for work, the UI shows it, and compliance is thin.
Pick Discord if: under 25 person team, no SOC 2 requirements, voice culture matters.
Rocket.Chat ($4/user/mo self-hosted)
Self-hostable. Open source. Strongest if you have a security or compliance team that wants the messaging server on-prem. Drawback: you need a devops person to run it, the SaaS option exists but defeats the point.
Pick Rocket.Chat if: you have hard data-residency requirements or a security team that says no to SaaS.
Mattermost ($10/user/mo self-hosted Enterprise)
Similar to Rocket.Chat but more polished and more expensive. Strong with engineering teams. The 2026 AI search add-on is decent.
Pick Mattermost if: engineering-heavy org, want self-host, willing to pay more for polish than Rocket.Chat.
Twist by Doist ($6/user/mo)
Async-first. Threaded by design, no channel firehose. Calm by default. Drawback: tiny ecosystem, your team will give up integrations they love.
Pick Twist if: distributed team, you actually want async discipline, you can live without 80 percent of Slack's integration library.
Pumble ($2.99/user/mo)
Slack clone at a fraction of the price. Free tier has unlimited message history, which is the thing Slack stopped offering. Drawback: smaller integrations library, smaller community for troubleshooting.
Pick Pumble if: cost-driven decision, under 100 person team, want the Slack feel without the Slack bill.
Pricing comparison
| Tool | Price/user/mo (paid) | Free tier message history | AI search |
|---|---|---|---|
| Slack Pro | $8.75 | 90 days | +$10/user/mo |
| Microsoft Teams | $4 to $12.50 | Unlimited (free tier) | Copilot $30/user/mo |
| Google Chat | $7.20+ | N/A (Workspace bundle) | Gemini $20/user/mo |
| Discord | Free | Unlimited | None |
| Rocket.Chat | $4 | Unlimited | Add-on |
| Mattermost | $10 | Unlimited | Included Enterprise |
| Twist | $6 | Unlimited | Basic |
| Pumble | $2.99 | Unlimited | Beta |
Who should stay on Slack
If you have 200+ integrations actively in use, migration cost will swamp the savings. If your team is on Slack Connect with external partners, switching breaks those workflows. If you're a startup under 25 people on the free tier and you don't need older message history, stay. If you've already paid for the AI search add-on and are using it, the alternatives don't yet match what Slack ships there.
FAQ
How long does a migration take? 4 to 8 weeks for a 50-person team. The hard part isn't the tool, it's retraining muscle memory and rebuilding integration setups.
Can I export Slack history? Yes, the export is JSON. Pumble, Mattermost, and Rocket.Chat all have Slack import tools that work decently.
What about Slack Connect with clients? Microsoft Teams supports external federation. Most others don't, you'll keep Slack for external connect work and use the new tool internally.
Is Discord actually viable for work? Yes for under-25 teams with no compliance needs. Above that, the lack of audit logs becomes a problem.
What about Slack Connect with clients? Microsoft Teams now supports cross-tenant federation in 2026 (it's the closest analog), but most of the alternatives don't replicate Slack Connect well. Many teams end up keeping Slack on a Free plan just for external rooms while running internal chat on the new tool.
Will my team push back on the migration? Yes for the first 3 weeks. By week 6 the complaints stop. Lead with the bill savings and the unlimited history.
Microsoft 365 shops, Teams is the no-brainer migration. Google Workspace shops, Google Chat is fine. Cost-driven small teams, Pumble at $2.99. Engineering teams who want self-host, Mattermost or Rocket.Chat. Stay on Slack if your integration sprawl runs deep.