How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- Slack leads on integrations and AI, with 1B+ messages sent daily and 4M Slack Connect users weekly.
- Microsoft Teams is the natural pick if you already run Microsoft 365.
- Zoom and Webex cover the full stack from chat to meetings to phones, with 95% of the Fortune 500 on Webex.
- Mattermost and Rocket.Chat are the self-hosted options for regulated and security-sensitive teams.
- Lark, Flock, and Chanty offer strong free plans for small and mid-size businesses.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Slack | AI-powered team messaging | See website | Yes |
 Microsoft Teams | Microsoft 365 shops | See website | Yes |
 Zoom | meetings-first collaboration | See website | Yes |
 Webex | enterprise unified communications | See website | Yes |
 Mattermost | self-hosted secure messaging | See website | Yes |
 Rocket.Chat | federated secure communications | See website | Yes |
 Lark | all-in-one productivity superapp | See website | Yes |
 Flock | small business team chat | See website | Yes |
 Chanty | AI work chat for SMBs | See website | Yes |
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Starting priceSee website
Free planYes
Slack is the AI work platform where teams actually talk: channels for transparent work, huddles for quick calls, Slack Connect for chatting with clients and vendors outside your company, and workflows that automate routine tasks. Slackbot brings AI answers and actions into every channel, with 1.7M apps actively used each week and 3M daily workflows. The platform reports 312% ROI over three years in a Forrester study.
The honest trade: Slack's free plan caps message history, and paid seats cost more than the bundled alternatives. Teams that live in their integrations and want the best messaging experience will find it worth it. Microsoft 365 shops should compare Teams first.
What we like- The largest integration ecosystem
- Slackbot AI and search across your company
- 1B+ messages sent daily
Watch out for- Message history limits on the free plan
- Costs add up per user
- Notification overload needs management
Starting priceSee website
Free planYes
Microsoft Teams is the collaboration hub for the Microsoft world: chat, video conferencing, calling, and file storage built around Office documents and SharePoint. If your company already pays for Microsoft 365, Teams is effectively free, and the integration with Word, Excel, and Outlook removes the friction of switching apps. It scales from small teams to enterprises with compliance and admin controls.
The honest note: Teams is at its best inside the Microsoft ecosystem and merely adequate outside it. Companies standardized on Google Workspace or mixed stacks may prefer Slack or Zoom. But if you already own Microsoft 365, the decision is nearly made.
What we like- Included with Microsoft 365
- Meetings, chat, and file storage in one
- Deep Office integration
Watch out for- The interface can feel heavy
- Best inside the Microsoft ecosystem
- Guest access is clunkier than Slack Connect
Starting priceSee website
Free planYes
Zoom grew from the meeting app everyone trusts into an AI-first work platform: Zoom Meetings, Zoom Chat, Zoom Phone, webinars, whiteboard, contact center, and events in one place. ZoomMate captures, summarizes, and extracts action items from meetings, and the platform scores 4.6/5 across 54,900+ G2 reviews. Customers from the New York Times to Capital One run on it.
The honest framing: Zoom is meetings-first, and its chat and collaboration features trail Slack and Teams in depth. If your team's day is built around video, Zoom Workplace is the natural home. If it is built around persistent chat, start with the messaging specialists.
What we like- The meetings standard everyone knows
- Zoom Chat, Phone, and whiteboard in one platform
- ZoomMate AI on paid plans
Watch out for- Chat is secondary to meetings
- The platform sprawl keeps growing
- Free meetings have time limits
Starting priceSee website
Free planYes
Webex by Cisco is the enterprise collaboration platform: eight integrated workloads from meetings and messaging to calling and contact center, with agentic AI built into every layer. The claim is scale: 95% of Fortune 500 companies run on Webex, and it is the only platform spanning unified communications, contact center, communications APIs, and devices, backed by Cisco's infrastructure and 40+ years of trust.
The honest catch: Webex is built for enterprises and priced and sold like it. Small businesses get a free plan but not the attention. Large organizations with Cisco infrastructure, contact centers, and meeting rooms should evaluate it against Teams and Zoom.
What we like- 95% of the Fortune 500 run on Webex
- The only platform spanning UCaaS, CCaaS, CPaaS, and devices
- Gartner UCaaS leader
Watch out for- Enterprise pricing and complexity
- The interface reflects its enterprise heritage
- Overkill for small teams
Starting priceSee website
Free planYes
Mattermost is the sovereign collaboration platform for teams that cannot put their data in someone else's cloud: zero-trust messaging, playbooks, and AI running self-hosted, in private cloud, or fully air-gapped, including classified networks. The US Air Force, NASA, and critical infrastructure operators trust it, with 200,000+ concurrent users supported and DoD IL2 to IL6 compliance.
The honest note: self-hosting means you own the operations burden, and the integration ecosystem is smaller than Slack's. Regulated industries, defense, and companies with strict data residency get control no cloud platform offers. Everyone else should weigh the operational cost.
What we like- Self-hosted, private cloud, or fully air-gapped
- Trusted by the US Air Force and NASA
- You own the data, model, and keys
Watch out for- You run the infrastructure
- The ecosystem is smaller than Slack's
- The enterprise AI features are paid
Starting priceSee website
Free planYes
Rocket.Chat is the secure communications platform built for interoperability: native Matrix and XMPP federation means agencies, allies, and partners collaborate without running the same system. Deploy self-hosted, air-gapped, or in sovereign cloud with zero-trust security and post-quantum encryption up to IL6, plus AI that works inside your perimeter.
The honest framing: Rocket.Chat's heart is in defense and critical infrastructure, which shows in both strengths and product choices. Commercial teams wanting a Slack alternative they control will find it solid. Teams without sovereignty requirements get more polish from the mainstream platforms.
What we like- Native Matrix and XMPP federation
- Self-hosted, air-gapped, or sovereign cloud
- Zero-trust with post-quantum encryption
Watch out for- The defense focus shapes the product
- Smaller commercial ecosystem
- Enterprise governance features are paid
Starting priceSee website
Free planYes
Lark is the productivity superapp: chat, meetings, docs, and project management unified in one workspace, with a mobile-first design that works for frontline as well as office teams. Customers like 7-Eleven run thousands of stores on it, and Xiaomi coordinates across 40+ countries. The free plan is generous, making it a real option for cost-conscious companies.
The honest note: Lark's US ecosystem and third-party integrations are thinner than Slack's or Teams'. Companies with global or frontline workforces get the most value. Teams deeply invested in the US SaaS ecosystem should check integration coverage before switching.
What we like- Chat, meetings, docs, and projects in one superapp
- Strong mobile experience for frontline teams
- Generous free plan
Watch out for- Smaller US presence and ecosystem
- The superapp model is a big switch
- Some integrations trail the leaders
Starting priceSee website
Free planYes
Flock is the team messenger built for growing businesses: channels for organized conversations, built-in video and voice calling, and productivity tools like shared notes, to-dos, polls, and reminders without leaving the app. Integrations with Asana, Trello, Jira, and Zoom connect it to your existing tools, and the onboarding is designed to get a whole company running fast.
The honest framing: Flock competes with Slack on features but not on ecosystem or scale. Small and mid-size businesses that want Slack-style collaboration at a friendlier price and pace will like it. Enterprises should stick with the platforms that scale to thousands.
What we like- Channels, video calls, and productivity tools in one
- Built-in notes, to-dos, polls, and reminders
- Easy onboarding
Watch out for- Smaller ecosystem than the giants
- Less suited to large enterprises
- Brand recognition is low
Starting priceSee website
Free planYes
Chanty is the multiplayer AI work chat: team messaging where AI agents work alongside people, assigned tasks, drafting from threads, and orchestrating workflows, with full audit trails and one-click revoke. It offers 120+ permission settings, SOC 2 and ISO 27001 compliance, and a free plan positioned against enterprise price tags, aimed at businesses mixing office and deskless teams.
The honest catch: Chanty is younger and smaller than the leaders, with a thinner integration catalog. Small businesses that want AI agents in their team chat without enterprise cost or complexity should try it. Teams needing the deepest ecosystem should look at Slack.
What we like- Agents and people work side by side in chat
- 120+ granular permission settings
- Free plan with no enterprise price tag
Watch out for- Smaller ecosystem and community
- The AI agent positioning is new
- Fewer third-party integrations
How we chose
We verified each tool's current homepage by opening the live site and using the final resolved URL. Microsoft Teams is listed under its official Microsoft page. No vendor publishes comparable starting prices in a uniform way, so all are listed as "See website"; free-plan status reflects each vendor's stated free tier. We reviewed product pages and public documentation. We did not test any tool hands-on.
Choosing by team type
Already in an ecosystem
Microsoft 365 shops should start with Teams; Google-heavy teams should look at Google Chat or Slack; Cisco shops should evaluate Webex. The platform that integrates with what you own wins on adoption.
Regulated or security-sensitive
Mattermost and Rocket.Chat let you host everything yourself, including air-gapped. No cloud platform matches that control. Budget for the operations work that comes with it.
Small business on a budget
Slack, Lark, Flock, and Chanty all offer real free plans. Start free, pay when you grow, and pick the one whose interface your team actually enjoys opening every day.
The adoption problem
The best collaboration platform is the one your team uses. Every tool here can message, meet, and share files; the differences that matter are adoption, integrations, and habit. Run a two-week trial with a real team, measure whether decisions actually move out of email, and buy the one that changed behavior.
Frequently asked questions
What is the best collaboration platform?
Slack leads for messaging depth and integrations; Microsoft Teams wins for Microsoft 365 shops; Zoom leads for meetings. For self-hosted security, Mattermost and Rocket.Chat. For budget SMBs, Lark, Flock, and Chanty all have strong free plans.
Is Slack or Microsoft Teams better?
It depends on your stack. Teams is effectively free with Microsoft 365 and integrates deeply with Office. Slack has the better messaging experience and larger integration ecosystem. Companies outside the Microsoft world usually prefer Slack.
Which collaboration tools have a free plan?
All nine in this guide offer a free tier: Slack, Teams, Zoom, Webex, Mattermost, Rocket.Chat, Lark, Flock, and Chanty. Free plans typically limit message history, meeting length, or storage; check each vendor's current terms.
Can I self-host a collaboration platform?
Yes. Mattermost and Rocket.Chat both offer self-hosted and air-gapped deployments, which is why defense, government, and regulated industries use them. You own the data and the infrastructure.
What is the difference between Zoom and Zoom Workplace?
Zoom Workplace is the current name for Zoom's AI-first collaboration platform, bundling Meetings, Chat, Phone, whiteboard, and ZoomMate AI. Zoom is the company; Workplace is the platform.
Do I need a separate tool for meetings and chat?
Not anymore. Slack, Teams, Zoom, Webex, and Lark all bundle messaging and meetings. Specialists still exist, but most teams are fine with one platform for both.
Sources we checked (9)
- https://slack.com/
- https://www.microsoft.com/en-us/microsoft-teams/group-chat-software/
- https://www.zoom.com/
- https://www.webex.com/
- https://mattermost.com/
- https://www.rocket.chat/
- https://www.larksuite.com/
- https://www.flock.com/
- https://www.chanty.com/
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.