Best Slack Alternatives for Teams 2026
Best Slack Alternatives for Teams 2026
TL;DR
Slack's Pro plan costs $7.25/user/month (billed annually) in 2026. For a 20-person team, that's $1,740/year for team messaging. The best alternatives depend on your situation: Microsoft Teams is included free in most Microsoft 365 subscriptions, Google Chat is free with Google Workspace, Discord works well for communities and async-heavy teams, and Mattermost is the self-hosted option for privacy-sensitive teams. For most SMBs already paying for M365 or Google Workspace, switching to bundled messaging saves money without meaningful capability loss.
Key Takeaways
- Slack Pro costs $7.25/user/month in 2026 — a 20-person team pays $1,740/year
- Microsoft Teams Essentials is $4/user/month — and most M365 subscribers get Teams free
- Google Chat is included with every Google Workspace plan ($6-$18/user/month)
- Discord has a free tier with unlimited message history — best for async, community-adjacent teams
- Mattermost is the open-source, self-hostable alternative — free for self-hosted, paid for cloud
- Flock is the cheapest paid alternative at $6/user/month with a generous free tier
- All alternatives support Slack export/import or CSV contact migration
Why Teams Are Leaving Slack in 2026
Slack remains the category-defining team messaging platform — its threading model, integrations, and search are genuinely best-in-class. But teams leave for three consistent reasons:
Cost at scale: Slack's Pro plan ($7.25/user/month) adds up fast. A 50-person company pays $4,350/year just for messaging. Many realize they're paying premium prices for messaging bundled into software they already pay for (M365, Google Workspace).
90-day message history on free plan: Slack's free tier limits message search to 90 days. Growing startups hit this wall, triggering an upgrade decision sooner than expected.
Subscription fatigue: In a world of Notion, Linear, Figma, and a dozen other SaaS tools, teams are consolidating. Choosing a communication tool bundled with their productivity suite reduces vendor count.
Best Slack Alternatives
1. Microsoft Teams — Best for Microsoft 365 Users
Best for: Teams already paying for Microsoft 365 Business or enterprise plans
Microsoft Teams is the single most practical Slack alternative for most businesses in 2026 — not because it's better than Slack, but because many teams are already paying for it.
Microsoft 365 plan inclusion:
- M365 Business Basic ($6/user/month): Includes Teams with unlimited messages and 1TB OneDrive
- M365 Business Standard ($12.50/user/month): Full Teams + Office desktop apps
- Enterprise plans: All include Teams
If your team uses Outlook, SharePoint, or any Office apps, you already have Teams. The question isn't "should we pay for Teams?" — it's "are we underusing what we're already paying for?"
Teams vs Slack feature comparison:
| Feature | Microsoft Teams | Slack Pro |
|---|---|---|
| Message history | Unlimited | Unlimited |
| File storage | 1TB/org (OneDrive) | 10GB/workspace |
| Video calls | ✅ Built-in (300 participants) | ✅ (Huddles, 50 participants) |
| Threads | ✅ | ✅ Best-in-class |
| App integrations | 700+ | 2,600+ |
| Search | Good | Excellent |
| Phone system | ✅ (Teams Phone add-on) | ❌ |
Where Teams falls behind Slack: Thread UX is more complex, the mobile app is heavier, and the integration ecosystem is smaller. Developers tend to find Slack's workflow more intuitive.
Pricing: Included in most M365 plans. Standalone Teams Essentials: $4/user/month.
2. Google Chat — Best for Google Workspace Users
Best for: Teams using Gmail, Google Docs, Drive, and Meet as their primary productivity tools
Google Chat is Slack's equivalent bundled into Google Workspace. Every Google Workspace plan includes Chat with unlimited message history.
Google Workspace plan inclusion:
- Business Starter ($6/user/month): Chat + Gmail + Drive + Meet + Docs
- Business Standard ($12/user/month): Same + 2TB storage, larger Meet rooms
- Business Plus ($18/user/month): Same + eDiscovery, retention policies
Like Teams, Chat is most attractive as a cost-saving move for teams already in the Google ecosystem.
Chat's UX in 2026: Google has invested heavily in Chat since discontinuing Hangouts. The interface is cleaner than it was in 2022, Spaces (channels) work well for async communication, and the integration with Google Docs/Drive is seamless — you can preview and edit Docs directly in a Chat thread.
Where Google Chat falls behind Slack: Fewer third-party integrations, no equivalent to Slack's Workflow Builder for automation, and less developer-friendly API.
Pricing: Free with all Google Workspace plans ($6-$18/user/month).
3. Discord — Best for Async and Community-Adjacent Teams
Best for: Startups, developer teams, creator businesses, and remote-first companies comfortable with async work
Discord is primarily known as a gaming platform, but its adoption in professional and developer contexts has grown significantly. By 2026, thousands of startups and developer communities run on Discord rather than Slack.
Why developer and startup teams choose Discord over Slack:
- Free tier has unlimited message history — no 90-day wall
- Voice channels — always-on voice rooms for drop-in conversation (similar to Slack Huddles but available on free tier)
- Threads — work well for async discussion
- Stage channels — host team AMAs, all-hands, or demos
- Bots and automations — Discord's bot ecosystem (MEE6, Midjourney-style workflows) is extensive
- No per-user pricing — a server is a server; invite 50 or 500 people for free
Discord Nitro for teams: Discord doesn't have a dedicated "business" plan. Teams using Discord professionally either use it free or purchase Nitro for individual quality-of-life improvements ($9.99/month per user, not required for teams).
Where Discord falls behind Slack:
- No native search as powerful as Slack
- Less professional UX — Discord's origins show in the interface
- No built-in analytics or compliance features (a concern for regulated industries)
- File upload size limited to 8MB on free (25MB with Nitro)
Best fit: Teams under 50 people, developer-heavy teams, startups with a community component, teams that value async voice rooms.
4. Mattermost — Best for Self-Hosted/Privacy-Focused Teams
Best for: Teams that need to keep communications on their own infrastructure (healthcare, finance, government, security)
Mattermost is the open-source Slack alternative. It looks and works almost identically to Slack, can be self-hosted on your own server, and gives you complete control over your data.
Deployment options:
- Mattermost Community Edition — Free, self-hosted, unlimited users, unlimited message history
- Mattermost Enterprise — From $3.25/user/month, adds SSO, compliance exports, advanced permissions
- Mattermost Cloud — $10/user/month (hosted by Mattermost team)
Self-hosting Mattermost:
# Docker Compose setup (simplest)
git clone https://github.com/mattermost/docker
cd docker
cp env.example .env
# Edit .env with your domain and Postgres settings
docker compose up -d
Minimum server requirements: 2GB RAM, 1 vCPU. A $6/month VPS covers a 10-person team.
Migration from Slack: Mattermost has a dedicated Slack import tool that migrates channels, users, and message history. The migration is not perfect (Slack's export format has limitations) but covers the majority of conversation history.
Where Mattermost falls behind Slack: The app ecosystem is smaller. Mobile apps are functional but less polished. Setup requires technical comfort for self-hosting.
5. Flock — Best Budget Alternative
Best for: Small teams wanting a familiar Slack-like interface at a lower price point
Flock is the most direct feature-for-feature Slack alternative at a lower price. It offers channels, direct messages, threads, video calls, file sharing, and a growing integration ecosystem.
Pricing:
- Free: Up to 20 members, 10K message history, 5GB storage
- Pro: $6/user/month (unlimited messages, 10GB/user, video calls)
- Enterprise: Custom pricing
At $6/user/month vs Slack's $7.25, Flock saves about $17/month for a 10-person team — modest, but real.
Weakness: Flock's integration ecosystem (75+ apps) is significantly smaller than Slack's (2,600+). If your workflow depends on specific Slack integrations, verify Flock supports them before migrating.
Quick Comparison Table
| Slack Pro | Teams | Google Chat | Discord | Mattermost | Flock | |
|---|---|---|---|---|---|---|
| Price | $7.25/u/mo | Incl. in M365 | Incl. in GW | Free | Free (self-hosted) | $6/u/mo |
| Message history | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited |
| Video calls | Huddles | 300 participants | Meet | Voice channels | ✅ | ✅ |
| Integrations | 2,600+ | 700+ | 200+ | Bot ecosystem | 60+ | 75+ |
| Self-hosted | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ |
| Free tier | 90-day limit | Yes (with M365) | Yes (with GW) | Unlimited | ✅ | Up to 20 users |
How to Migrate from Slack
Export from Slack: Workspace Settings → Import/Export Data → Export. Free workspaces export 90 days of history; paid workspaces export all history.
What exports cleanly: Public channel messages, direct messages (with member consent), files, user list.
What doesn't migrate: Slack-specific integrations, bots, workflow automations, custom emoji (can be re-added manually), Slack Connect external workspace connections.
Timeline: Data export takes 1-24 hours. Setting up the new platform takes 1-2 days. Team adjustment takes 1-2 weeks.
Recommendations
- Already paying for M365: Use Teams — you're paying for it anyway
- Already using Google Workspace: Google Chat — same argument
- Startup or developer team: Discord (free) — best free tier, async voice, community-adjacent
- Privacy-sensitive team: Mattermost self-hosted — own your data
- Want to stay close to Slack at lower cost: Flock Pro
- Large enterprise with compliance needs: Teams or Slack (Teams has stronger compliance tooling)
Methodology
- Sources: thedigitalprojectmanager.com Slack alternatives, g2.com team collaboration category (March 2026), official pricing pages (Slack, Teams, Google Workspace, Discord, Mattermost, Flock), PCMag business communication reviews, Zapier/blog Slack alternatives
- Data as of: March 2026
See the broader context for communication tools alongside project management: Top Trello Alternatives for Teams 2026.
Evaluating CRM and sales tools at the same time? See Best Free CRM Software for Startups 2026.
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