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1. Microsoft Teams
Microsoft Teams Best Microsoft 365
If your company uses Microsoft 365, Teams is essentially free with Word, Excel, SharePoint, and Outlook integration. Copilot AI adds meeting summaries and action items.
- Pricing: Free; Essentials $4/user/mo; Business Basic $6/user/mo
- Pros: Included with M365, excellent video, SharePoint, Copilot AI
- Cons: Can feel bloated, notifications overwhelming
- Best for: Organizations on Microsoft 365
2. Google Chat
Google Chat Best Google Workspace
Google Chat lives inside Gmail and integrates with Docs, Sheets, and Meet. Spaces organize conversations with threaded replies.
- Pricing: Included with Workspace ($7/user/mo+)
- Pros: Integrated with Gmail, Docs, Meet, clean interface
- Cons: Less feature-rich, limited bots
- Best for: Google Workspace teams wanting built-in chat
3. Discord
Discord Best Free
Discord provides unlimited messaging, voice channels, video calls, and screen sharing for free. Always-on voice channels create shared office feeling.
- Pricing: Free; Nitro $9.99/mo optional
- Pros: Free voice/video/text, screen sharing, excellent audio
- Cons: Gaming reputation, limited business features
- Best for: Small teams and startups wanting free communication
4. Rocket.Chat
Rocket.Chat Best Self-Hosted
Open-source Slack you host on your own servers. Complete data control, HIPAA/GDPR compliance, and federation between servers.
- Pricing: Free (self-hosted); Pro $4/user/mo
- Pros: Open source, self-hosted, full data control, federation
- Cons: Requires infrastructure, smaller plugins
- Best for: Organizations with data sovereignty requirements
5. Mattermost
Mattermost Best DevOps
Deep integrations with Jira, GitLab, PagerDuty, and Jenkins. Self-hosted with complete data ownership and plugin system.
- Pricing: Free (self-hosted); Professional $10/user/mo
- Pros: Open source, DevOps integrations, custom plugins
- Cons: Setup required, fewer casual features
- Best for: Engineering teams wanting self-hosted Slack with DevOps
6. Chanty
Chanty Best Small Teams
Chat with built-in task management. Convert messages to tasks with one click. At $3/user/mo, the most affordable paid Slack alternative.
- Pricing: Free (10 members); Business $3/user/mo
- Pros: Simple pricing, task management built-in, affordable
- Cons: Limited integrations, smaller features
- Best for: Small teams of 10-25 wanting chat + tasks
7. Flock
Flock Best Productivity
Productivity tools directly in messaging: shared to-dos, polls, notes, code snippets, and reminders alongside conversations.
- Pricing: Free (20 users); Pro $6/user/mo
- Pros: Built-in polls, notes, to-dos, reminders
- Cons: Smaller user base, limited enterprise tools
- Best for: Teams wanting productivity built into messaging
8. Twist
Twist Best Async
Built for async. Every conversation is a thread - no endless channel scrolling. Designed by Todoist team for remote work.
- Pricing: Free (limited); Unlimited $8/user/mo
- Pros: Thread-first, async communication, minimal notifications
- Cons: No real-time chat mode, limited integrations
- Best for: Remote teams across time zones
9. Pumble
Pumble Best Free Large Teams
Free for unlimited users - no caps, no history limits. Slack-like interface makes migration painless. Voice and video included.
- Pricing: Free (unlimited users); Pro $2.49/user/mo
- Pros: Free unlimited users, Slack-like interface, voice/video
- Cons: Fewer integrations, newer platform
- Best for: Large teams wanting free Slack-like messaging
10. Element
Element Best Security
End-to-end encryption on Matrix protocol. Decentralized, no single point of failure. Used by governments for secure communication.
- Pricing: Free (self-hosted); Starter $5/user/mo
- Pros: End-to-end encryption, decentralized, open source
- Cons: Technical setup, smaller ecosystem
- Best for: Security-focused organizations needing encrypted comms
Finding the right software is just the start.
LeadSpark helps you discover, compare, and choose the best business tools - backed by real data, not sponsored rankings.
Explore LeadSparkQuick Comparison
| Platform | Starting Price | Best For |
|---|---|---|
| Microsoft Teams | Free | Organizations on Microsoft 365 |
| Google Chat | Included with Workspace ($7/user/mo+) | Google Workspace teams wanting built-in chat |
| Discord | Free | Small teams and startups wanting free communication |
| Rocket.Chat | Free (self-hosted) | Organizations with data sovereignty requirements |
| Mattermost | Free (self-hosted) | Engineering teams wanting self-hosted Slack with DevOps |
| Chanty | Free (10 members) | Small teams of 10-25 wanting chat + tasks |
| Flock | Free (20 users) | Teams wanting productivity built into messaging |
| Twist | Free (limited) | Remote teams across time zones |
| Pumble | Free (unlimited users) | Large teams wanting free Slack-like messaging |
| Element | Free (self-hosted) | Security-focused organizations needing encrypted comms |
Frequently Asked Questions
Why is Slack expensive?
Slack Pro costs $8.75/user/mo. A 50-person team pays $437/mo. Pumble (free), Discord (free), or Chanty ($3/user) cut costs 80%+.
Best free Slack alternative?
Pumble (unlimited users), Discord (best voice), and Google Chat (if on Workspace).
Can I self-host?
Yes. Rocket.Chat, Mattermost, and Element offer free self-hosted options with full data control.
Best for remote teams?
Twist for async, Discord for always-on voice, or Microsoft Teams for video + documents.