TL;DR
Looking for free alternatives to Slack? Here are the best open source and free options for Mac.
What is the best free alternative to Slack?
The best free alternative to Slack (paid plans) is Element, which is open source. Install it with: brew install --cask element.
Free Alternative to Slack
Save paid plans with these 1 free and open source alternatives that work great on macOS.
Our Top Pick
Quick Comparison
| App | Price | Open Source | Category |
|---|---|---|---|
| Slack | paid plans | No | — |
| Element | Free | Yes | Communication |
Stop Paying for Slack: The Actual Free Alternatives Worth Your Time
Slack started as a fun escape from email. Now it is the corporate establishment. Salesforce bought it for 27 billion dollars in 2020. The price keeps creeping up while the desktop application eats gigabytes of RAM. The breaking point for many small teams happened when Slack altered its free tier. You used to get 10,000 messages of history. Now you only get 90 days. If someone linked a vital Google Doc in July, it vanishes by Halloween. That is completely unacceptable for a knowledge base.
I spent the last three months migrating dummy workspaces across different chat applications. I wanted to see what happens when you refuse to pay 8.75 per user per month. Some open-source options are surprisingly polished. Others feel like they require a computer science degree just to configure a basic webhook.
You have two main paths here. You can self-host an open-source tool. That takes work but gives you total data sovereignty. Or you can jump to a different proprietary service with a better free tier. I tested both approaches on my M2 MacBook Air. I monitored CPU usage, checked mobile app reliability, and verified whether custom emojis actually sync properly. This guide breaks down the free alternatives actually worth your time.
Detailed Alternative Reviews
Element
Encrypted chat built on the decentralized Matrix protocol
brew install --cask elementI used Element as my daily driver for two weeks. It runs on the Matrix network. This means it operates more like email than a closed silo. You can message people on other servers. The default end-to-end encryption works well for privacy. Verifying new devices is incredibly annoying. You have to scan QR codes or compare long strings of text every time you log in somewhere new. The interface feels clinical and lacks the playful nature of Slack. It handles large file uploads easily. Version 1.11.39 consumed about 400MB of RAM during my tests.
Key Features:
- Matrix protocol support
- End-to-end encryption
- Open federation
- Read receipts
- Voice and video calls
- Custom widgets
- Markdown formatting
- Cross-server bridging
Limitations:
- • Key verification process is frustrating
- • Interface lacks visual warmth
- • Bridging to other networks requires deep technical knowledge
- • Search is slow due to local encryption
Best for: Decentralized teams and privacy-conscious organizations
Mattermost
The closest 1:1 clone of classic Slack
brew install --cask mattermostThis is the closest you will get to a direct Slack clone. I spun up a Docker container with the latest Mattermost release in about ten minutes. It is written in Go. The server resource usage is incredibly low compared to Java-based alternatives. The interface mimics old-school Slack before they introduced the confusing new sidebar layout. Threading works exactly how you expect. The free tier locks away advanced user permissions. You cannot restrict who creates channels. The mobile application occasionally drops push notifications if it sits idle in the background too long.
Key Features:
- Threaded messaging
- Slash commands
- Custom emojis
- Slack-compatible webhooks
- Jira integration
- Markdown support
- File sharing
- Multi-language support
Limitations:
- • Free tier lacks advanced user permissions
- • Mobile push notifications can be unreliable on self-hosted setups
- • Visual design is rigid with few customization options
Best for: Engineering teams looking for a direct drop-in replacement
Zulip
Topic-based threading that cures notification anxiety
brew install --cask zulipZulip forces you to change how you communicate. Every single message must belong to a topic. It feels like a hybrid between a chat room and an email inbox. I struggled with it for the first three days. Then it clicked. You can ignore the application for six hours and catch up in five minutes without losing context. The Python backend is fast. The visual design looks like a 2012 web forum. The learning curve guarantees some of your coworkers will complain loudly during the first week.
Key Features:
- Mandatory topic-based threading
- Advanced keyboard shortcuts
- Code block syntax highlighting
- Stream organization
- Read state tracking
- Bulk message management
- Custom notification routing
- LDAP integration
Limitations:
- • Steep learning curve for new users
- • Outdated visual design
- • Mobile application feels like a web wrapper
- • Requires strict team discipline to maintain topics
Best for: Asynchronous remote teams spread across multiple time zones
Rocket.Chat
Omnichannel platform with a massive feature set
brew install --cask rocketchatRocket.Chat wants to do everything. It handles internal team chat, customer support widgets, and external bridging. The feature list is exhausting. I tested version 6.0 on a small cloud server. The interface feels heavy. Navigating the administration panel requires endless scrolling through nested menus. It supports LDAP right out of the box on the free version. That is rare. The company recently started pushing paid features aggressively. Free users now face limits on monthly push notifications.
Key Features:
- Omnichannel routing
- Guest user support
- Audio messages
- Screen sharing
- LDAP directory support
- Off-the-record messaging
- Custom themes
- Extensive REST API
Limitations:
- • Server resource heavy
- • Free tier caps monthly push notifications
- • Settings menu is confusing
- • Interface feels cluttered
Best for: Large organizations needing internal chat and customer support in one tool
Discord
Flawless voice channels hindered by poor text threading
brew install --cask discordGamers built Discord. Corporate teams hijacked it. The voice channels are brilliant. You just click a room and start talking without generating a meeting link. Text chat is a completely different story. Discord does not understand professional threading. Threads automatically archive after a set period. Finding old decisions is nearly impossible. The free tier caps file uploads at a measly 25MB. The privacy policy allows them to collect vast amounts of usage data. You will also have to tolerate popups advertising video games.
Key Features:
- Always-on voice channels
- High-quality screen sharing
- Role-based access control
- Custom soundboards
- Massive bot ecosystem
- Markdown formatting
- Folder organization
- Granular notification settings
Limitations:
- • Threads archive automatically
- • File uploads capped at 25MB on free tier
- • Privacy policy allows extensive data collection
- • Frequent gaming-related advertisements
Best for: Creative teams relying heavily on quick audio huddles
Twist
Asynchronous communication without the online status dots
brew install --cask twistDoist built Twist specifically to kill real-time chat. There are no online status dots. You cannot see if someone is typing. Everything lives in structured threads. I found this incredibly peaceful. I also found it frustrating when I needed a quick answer about a broken server. The interface is exceptionally clean. It looks like a modern iOS application. The free tier is severely restricted. You only get access to one month of message history. That makes the free version useless for long-term project reference.
Key Features:
- Thread-first design
- Inbox zero approach
- No online presence indicators
- Structured channels
- Guest access
- Todoist integration
- Keyboard shortcuts
- Snooze functionality
Limitations:
- • Free tier limits history to one month
- • Terrible for urgent technical incidents
- • Direct messaging is buried in the interface
- • Slow pace frustrates high-velocity teams
Best for: Content agencies suffering from severe notification fatigue
Wire
Strict Swiss privacy laws meeting modern team chat
brew install --cask wireWire focuses entirely on privacy. The Swiss company built everything around end-to-end encryption. I tested the desktop application on macOS. It feels lightweight and responsive. The audio call quality is noticeably better than Slack huddles. The encryption creates massive problems for search. You can only search messages that are cached locally on your current device. If you log in on a new laptop, your old search history does not exist there. Finding the free tier on their website requires digging through several pricing pages.
Key Features:
- End-to-end encryption
- Secure guest rooms
- Disappearing messages
- Encrypted file drops
- Screen sharing
- Voice filters
- Multi-device sync
- GDPR compliance
Limitations:
- • Search functionality is heavily restricted by local encryption
- • Free tier is deliberately hidden on their website
- • Group sizes are strictly capped
- • Interface lacks personality
Best for: Law firms and medical teams requiring absolute confidentiality
Guilded
A Discord clone with better free features
brew install --cask guildedGuilded is a direct Discord competitor owned by Roblox. It offers features for free that Discord charges money for. You get 500MB file uploads and 1080p screen sharing without paying a dime. The interface is a carbon copy of Discord. I tested the macOS application and found it surprisingly snappy. The threading system is slightly better than Discord. The entire platform is heavily geared toward gaming communities. Your team will have to ignore tournaments and clan recruitment features.
Key Features:
- 500MB file uploads
- 1080p screen sharing
- Threaded text channels
- Integrated calendars
- Tournament brackets
- Always-on voice rooms
- Custom emotes
- Media channels
Limitations:
- • Heavily focuses on gaming features
- • Owned by Roblox which raises corporate longevity questions
- • Smaller bot ecosystem than Discord
- • No self-hosting option
Best for: Large public communities needing massive file uploads for free
Which Alternative is Right for You?
Engineering team needing deep GitHub integration and local data control
→ Mattermost. It accepts Slack-formatted webhooks natively. You can point your existing GitHub alerts at a Mattermost server without rewriting the JSON payloads.
Distributed open-source project with hundreds of casual contributors
→ Element. The open federation model allows anyone to join using their existing Matrix account. You do not have to manage user accounts or pay per-seat licenses.
Video production crew needing instant drop-in audio chat
→ Discord. The always-on voice channels are superior to Slack huddles. The low-latency audio is perfect for coordinating live broadcasts or editing sessions.
Asynchronous remote team spread across eight different time zones
→ Zulip. The strict topic-based threading ensures conversations stay organized for days. Someone in Tokyo can easily catch up on a discussion started by someone in London.
Small law firm requiring absolute confidentiality and end-to-end encryption
→ Wire. The default encryption is rock solid. The company operates under strict Swiss privacy laws. It is much easier to set up than a self-hosted encrypted alternative.
Content agency fighting notification fatigue and constant interruptions
→ Twist. The lack of online status indicators forces a slower pace of work. It treats chat more like an organized email inbox.
Gaming community migrating away from standard forums
→ Guilded. It offers tournament brackets and calendar features built specifically for large public groups. The unlimited file storage is a huge bonus.
University research lab with strict on-premise hosting requirements
→ Rocket.Chat. It includes built-in LDAP integration on the free tier. You can tie it directly into the university directory system without paying enterprise fees.
Migration Tips
Export before the 90-day cutoff
Slack only exports messages that are currently visible on your free tier. If you wait too long, older messages are gone forever. Run the workspace export tool immediately before you start testing alternatives.
Use the Mattermost bulk importer
Mattermost maintains a dedicated Slack import tool. It reads the raw JSON files from your Slack export and rebuilds your channels. It even maintains the original timestamps.
Warn your team about the mobile application
Self-hosted chat servers often struggle with Apple push notifications. You usually have to route notifications through a proxy server operated by the software developer. Test this thoroughly before migrating.
Archive your custom emojis manually
Slack exports do not include your custom emoji image files. You must use a browser extension or a third-party Python script to scrape them from your workspace before deleting your account.
Freeze your Slack workspace
Do not run two chat applications simultaneously. Pick a Friday afternoon. Make the Slack workspace read-only. Force everyone to log into the new tool on Monday morning.
Reconfigure your webhook payloads
Most external tools default to Slack formatting. If your new chat application does not parse Slack JSON payloads, you will need to use a middleware tool like n8n to translate the incoming data.
Quick comparison
| App | Price | Open Source | Best For | Install Command |
|---|---|---|---|---|
| Element | Free / Paid hosting | Yes | Decentralized teams | brew install --cask element |
| Mattermost | Free / Enterprise | Yes | Direct Slack replacements | brew install --cask mattermost |
| Zulip | Free / Paid hosting | Yes | Asynchronous remote work | brew install --cask zulip |
| Rocket.Chat | Free / Enterprise | Yes | Large organizations | brew install --cask rocketchat |
| Discord | Free / Nitro | No | Voice-heavy collaboration | brew install --cask discord |
| Twist | Free / Paid | No | Reducing notification fatigue | brew install --cask twist |
| Wire | Free / Pro | Yes | High-security environments | brew install --cask wire |
| Guilded | Free | No | Large gaming communities | brew install --cask guilded |
The verdict
Mattermost
Mattermost feels like a comfortable pair of shoes. It mimics the classic Slack interface perfectly. The Go backend is highly efficient on server resources. You get complete control over your data without forcing your team to learn a radical new way of communicating.
Zulip
Zulip requires patience. The mandatory topic threading is jarring at first. Once your team adapts, it completely cures notification anxiety. It is the smartest approach to asynchronous communication I have tested.
Element
Element gives you true independence. The Matrix protocol ensures you are never locked into a single vendor again. The end-to-end encryption guarantees your conversations remain private.
Full reviewBottom line
Moving away from Slack is entirely possible. It just requires a mindset shift. You are trading convenience for control. I found that self-hosting Mattermost provides the least friction for a typical office team. If you want a hosted solution, Twist offers a fascinating alternative to real-time stress. The era of free, unlimited corporate chat on proprietary platforms is dead. You either pay the monthly fee or you take ownership of your own infrastructure.
Frequently Asked Questions
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About the Author
Productivity & Workflow Analyst
Jordan Kim focuses on productivity software, system utilities, and workflow optimization tools. With a background in operations management and process improvement, Jordan evaluates how well applications integrate into daily workflows and enhance overall productivity.