Slack changed team communication, but its pricing and recent free plan restrictions are pushing teams to reconsider. The 90-day message history limit on the free plan means new hires cannot search past conversations, project context disappears, and institutional knowledge evaporates. On paid plans, $7.25/user/month sounds reasonable until you multiply it across your entire organization. A 100-person company pays $8,700/year for messaging. The alternatives below offer full message history, built-in video calls, and project management features that Slack requires separate tools for. Managing your team's collaboration stack should not require three different subscriptions.
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Why Teams Leave Slack
Three issues dominate Slack migration conversations. First, the 90-day message limit on free plans destroys searchability - the feature that made Slack valuable in the first place. Second, Slack is just messaging. Video calls, project boards, document collaboration, and file storage all require separate paid tools. Third, notification fatigue in large Slack workspaces reduces productivity. A 2025 study found that workers check Slack an average of 77 times per day, and each context switch costs 23 minutes of refocused attention. The best alternatives address at least two of these three problems.
1. Microsoft Teams
Microsoft Teams Best for Microsoft Shops
Microsoft Teams is included with every Microsoft 365 subscription, which means most businesses already have access and are paying for Slack on top. Teams combines messaging, video conferencing, file sharing, and app integration in a single workspace. The free version supports 100 participants in video calls for 60 minutes, unlimited chat, and 5GB of storage. For organizations using Word, Excel, PowerPoint, and SharePoint, the native integration eliminates the friction of switching between tools. Copilot AI summarizes meetings, generates action items, and catches you up on channels you missed.
- Pricing: Free (60-min meetings, 5GB); Microsoft 365 Business Basic $6/user/mo; Business Standard $12.50/user/mo
- Pros: Included with Microsoft 365, video + chat + files unified, Copilot AI, 300-participant meetings, SharePoint integration
- Cons: Heavier app than Slack, can feel overwhelming, threading less intuitive, slower on older hardware
- Best for: Organizations already using Microsoft 365 that want to eliminate a separate messaging bill
2. Google Chat (Google Workspace)
Google Chat Best for Google Users
Google Chat is the messaging layer of Google Workspace, integrated directly into Gmail. If your team lives in Google Docs, Sheets, and Drive, Chat keeps conversations next to the files they reference. Spaces (Google's channels) support threaded conversations, shared files, and task assignments. Google Meet integration means video calls launch from any conversation. The AI features summarize long threads and suggest responses. Unlike Slack, there is no separate app to manage - Chat lives inside Gmail's sidebar.
- Pricing: Included with Google Workspace: Business Starter $7/user/mo; Business Standard $14/user/mo; Business Plus $22/user/mo
- Pros: Lives in Gmail, native Google Drive/Docs/Meet integration, Spaces for project conversations, AI summaries, no extra cost
- Cons: Lacks Slack's app ecosystem, threading can feel awkward, notifications less customizable, no free standalone plan
- Best for: Teams already on Google Workspace who want messaging without an additional subscription
3. Mattermost
Mattermost Best Open Source
Mattermost is the open-source Slack alternative built for teams that need data sovereignty. Self-host on your own infrastructure with full control over your data, or use the cloud version. The free plan includes unlimited message history, unlimited users, and integrations - addressing the exact pain points that drive teams away from Slack's free tier. DevOps teams particularly value the built-in incident management, playbooks, and CI/CD integrations. Custom compliance and data retention policies make it viable for regulated industries like healthcare and finance.
- Pricing: Free (self-hosted, unlimited); Cloud Free (10,000 messages); Professional $10/user/mo; Enterprise custom
- Pros: Open source, self-hosted option, unlimited free history, DevOps integrations, compliance features, custom branding
- Cons: Self-hosting requires infrastructure management, smaller plugin ecosystem, cloud free plan limited
- Best for: Engineering teams and regulated industries that need self-hosted messaging with full data control
Migration tip: Export before you switch
Slack allows workspace data exports on paid plans. Download your full message history, files, and channel structure before canceling. On the free plan, you can only export data from the last 90 days. Most alternatives offer Slack importers - Mattermost and Rocket.Chat import Slack exports directly, preserving channel structure and message history. Coordinate the switch with your project management team so active project conversations transfer cleanly.
4. Rocket.Chat
Rocket.Chat Best Self-Hosted Free
Rocket.Chat is a fully open-source communication platform with the most generous self-hosted free plan available. Install on your own servers and get unlimited users, channels, message history, file sharing, and video conferencing at zero cost. The platform supports omnichannel customer engagement - route WhatsApp, SMS, email, and live chat conversations into the same interface your team uses internally. For businesses that want one communication hub for both internal teams and external customers, Rocket.Chat eliminates the need for separate support software.
- Pricing: Community (self-hosted, free); Pro $4/user/mo; Enterprise custom
- Pros: Completely free self-hosted, omnichannel support, video calls, end-to-end encryption, Slack import, active community
- Cons: Self-hosting requires technical expertise, cloud hosting costs extra, fewer polished integrations than Slack
- Best for: Tech-savvy teams that want free, self-hosted messaging with omnichannel customer communication built in
5. Pumble
Pumble Best Free Messaging
Pumble is the closest Slack clone with the most generous free plan for teams that just want messaging. The free tier includes unlimited users, unlimited message history, channels, threads, and file sharing. Voice and video calls support up to 25 participants. The interface is intentionally Slack-like, which means zero retraining for teams switching over. If your complaint about Slack is purely the 90-day message limit and you do not need project management or advanced integrations, Pumble solves the exact problem for free.
- Pricing: Free (unlimited users + history); Pro $2.49/user/mo; Business $3.99/user/mo; Enterprise $6.99/user/mo
- Pros: Unlimited free history, Slack-like UI, voice/video calls, guest access, screen sharing, very low paid pricing
- Cons: Smaller integration ecosystem, newer platform with fewer features, no self-hosted option
- Best for: Teams that love Slack's interface but refuse to pay for full message history
6. Chanty
Chanty Best Simple Alternative
Chanty combines messaging with built-in task management, eliminating the need for a separate project tool for small teams. The Teambook feature organizes all conversations, tasks, files, and links in a single searchable view. The free plan supports 5 members with unlimited messaging and basic task management. Audio and video calls are included on all plans. For small teams that want messaging and task tracking without the overhead of managing Slack plus Asana, Chanty handles both in one interface.
- Pricing: Free (5 members); Business $3/user/mo
- Pros: Built-in task management, Teambook organizer, simple pricing, audio/video calls, clean interface
- Cons: Free plan limited to 5 members, fewer integrations, smaller community, limited customization
- Best for: Small teams under 10 people that want messaging and basic task management in one tool
7. Element (Matrix)
Element Best Security
Element is built on the Matrix protocol, an open standard for decentralized communication. End-to-end encryption is enabled by default - not as an add-on or enterprise feature. Self-host your own server or use Element's cloud. The decentralized architecture means no single point of failure and no vendor lock-in. Government agencies (including the French government and German military) use Element for secure communication. For teams handling sensitive data who need communication that meets strict compliance requirements, Element offers security guarantees that proprietary platforms cannot match.
- Pricing: Free (self-hosted via Matrix); Element Cloud from $5/user/mo; Enterprise custom
- Pros: End-to-end encryption default, decentralized protocol, self-hosted, government-grade security, no vendor lock-in
- Cons: Steeper learning curve, fewer casual integrations, UI less polished than Slack, federation complexity
- Best for: Security-conscious organizations that need encrypted, decentralized communication with no vendor dependency
Side-by-Side Comparison
| Tool | Free History | Free Video | Paid From | Best For |
|---|---|---|---|---|
| Microsoft Teams | Unlimited | 60-min, 100 people | $6/user/mo | Microsoft shops |
| Google Chat | Unlimited | Via Google Meet | $7/user/mo | Google Workspace users |
| Mattermost | Unlimited (self-hosted) | Plugin-based | $10/user/mo | DevOps / regulated |
| Rocket.Chat | Unlimited (self-hosted) | Built-in | $4/user/mo | Self-hosted + omnichannel |
| Pumble | Unlimited | 25 participants | $2.49/user/mo | Slack clone, free |
| Chanty | Unlimited | Built-in | $3/user/mo | Small teams + tasks |
| Element | Unlimited (self-hosted) | Built-in (Jitsi) | $5/user/mo | Security-first |
How to Choose the Right Alternative
Already paying for Microsoft 365? Teams is included in your subscription. Stop paying for Slack separately.
Google Workspace shop? Google Chat lives inside Gmail. No new app, no new subscription, no new login.
Need full data control? Mattermost and Rocket.Chat are open source and self-hostable. Mattermost wins for DevOps; Rocket.Chat adds customer-facing omnichannel.
Just want free Slack? Pumble has unlimited history, unlimited users, and a Slack-identical interface - all free.
For rethinking how your team communicates, A World Without Email by Cal Newport challenges the assumption that constant messaging is productive and offers better workflows.
Frequently Asked Questions
Why are teams switching away from Slack?
The biggest driver is Slack's free plan change that hides messages older than 90 days. Teams lose institutional knowledge, onboarding context, and project history. On paid plans, the $7.25/user/month Pro pricing adds up quickly for larger teams - a 50-person company pays $4,350/year. Teams also cite notification overload, channel sprawl, and the need for tools that combine messaging with project management instead of running both separately.
What is the best free Slack alternative?
For pure messaging, Rocket.Chat's self-hosted community edition is completely free with unlimited history and users. For teams that want messaging plus project management, Mattermost's free plan includes unlimited message history and integrations. Google Chat is free for Google Workspace subscribers who already pay for Gmail and Drive. Microsoft Teams is free for basic use with 60-minute group meetings.
Can Slack alternatives integrate with the same apps?
Microsoft Teams and Google Chat integrate natively with their respective ecosystems (Office 365, Google Workspace) which covers most business tools. For third-party integrations, all major alternatives support Zapier and webhook-based connections. Mattermost and Rocket.Chat offer open APIs for custom integrations. The Slack App Directory has 2,600+ apps, but most teams use fewer than 10 integrations - and those top integrations are available on every major alternative.
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