Rocket.Chat vs Slack
A source-aware comparison of pricing, documented capabilities and workflow fit.
Short answer
- Price: not directly comparable — Rocket.Chat is free tier available, Slack is from $8.75/user/mo billed monthly.
- How to start: Rocket.Chat is free tier available, Slack is from $8.75/user/mo billed monthly.
- Where they differ: only Rocket.Chat has open source / self-hostable; both offer public api, mobile app and sso (saml).
These lines are generated from the pricing we track, not from a paid placement. How we score tools.
What Rocket.Chat is
What Rocket.Chat isRocket.Chat is open-source team messaging that can be self-hosted, including in restricted environments. It runs in environments where hosted chat is not allowed at all, including air-gapped networks, which is its clearest reason to exist. In exchange you operate it, and the polish gap against hosted rivals is visible.
What Slack is
What Slack isSlack is much more than a chat app; it is the 'digital headquarters' for modern organizations. It eliminates the chaos of internal email by organizing communication into transparent, searchable, and themed channels. With thousands of integrations (GitHub, Jira, Google Drive), Slack centralizes your entire tech stack into one interface. Whether it's a quick voice chat via 'Huddles' or collaborative document editing with 'Canvas,' Slack is designed to keep hybrid and remote teams connected and productive in a fast-paced environment.
Side by side
| Rocket.Chat | Slack | |
|---|---|---|
| Category | Communication | Communication |
| How to start | Free tiernot a monthly price | $8.75/user/moverified |
| Public API | Yes | Yes |
| Mobile app | Yes | Yes |
| Open source / self-hostable | Yes | No |
| SSO (SAML) | Yes | Yes |
| Visit | Rocket.Chat ↗ | Slack ↗ |
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What Rocket.Chat is built to do
- Self-hosted messaging
- Runs the whole chat platform on your own infrastructure.
- Federation and bridges
- Connects to other chat networks and protocols.
- Compliance controls
- Applies retention, audit and data residency policies locally.
What Slack is built to do
- Slack Connect
- Securely collaborate with external partners and agencies in shared channels.
- Huddles
- Start instant audio and video sessions with one click for rapid decision-making.
- Workflow Builder
- Automate routine tasks like onboarding or approvals without writing a single line of code.
- Enterprise Security
- Institutional-grade data protection and single sign-on (SSO) support for large firms.
Choose Rocket.Chat if
- Organisations that must keep messaging on their own infrastructure.
Choose Slack if
- Teams on Pro at $7.25 per user/month billed annually ($8.75 monthly) who need unlimited message history
- Small groups testing the Free plan: 90 days of message history, up to 10 apps and 1:1 huddles
- Companies on Business+ at $15 per user/month annually ($18 monthly) that need group external messaging
Skip Slack if
- You rely on the Free plan long term — history is cut at 90 days and apps are capped at 10
- You need Multi-SAML or unlimited workspaces; those are Enterprise+ and priced only by sales
- Your headcount is large: every plan is per user, so cost scales linearly with the team
Evidence and freshness
Where a claim on this page comes from a vendor page, it is linked here.
Rocket.Chat: pros & cons
- Fully self-hostable and open source
- Omnichannel customer messaging included
- Highly customisable
- Setup and maintenance are on you
- Interface less refined than commercial rivals
- Mobile apps have rough edges
Slack: pros & cons
- Powerful Search: Find any file or message from years ago in a matter of seconds.
- Flexible Channels: Organize work by project, team, or even interests to maintain focus.
- Extensive API: Easily build and integrate your own bots and custom workflows.
- High Reliability: Desktop and mobile apps are exceptionally fast and stable.
- Notification Fatigue: Can be highly distracting if not properly configured by the user.
- Free Plan Limits: Access to message history is restricted on the free tier.
- Enterprise Pricing: Per-user licensing costs can add up quickly for large organizations.
Our verdict on Rocket.Chat
Strong when self-hosting is required. Otherwise commercial chat is less work.
Our verdict on Slack
An indispensable tool for moving team communication away from email and into a faster era.
Published plans, side by side
Every figure below was read from the vendor's own pricing page and is shown with the sentence it came from. Where a vendor publishes no plan prices, we say so rather than guess.
Rocket.Chat
No published plan prices verified. Rocket.Chat either quotes on request or renders its prices in a way we could not read from the pricing page.
Slack
- Free$0/mo
Free $0: 90 days message history, up to 10 apps, 1:1 huddles, 1:1 external messages
- Pro$8.75/user/mo billed monthly
Pro $8.75/user/month monthly or $7.25/user/month annual: unlimited history and apps, group huddles
- Business+$18/user/mo billed monthly
Business+ $18/user/month monthly or $15/user/month annual
Rocket.Chat vs Slack: common questions
- Does Rocket.Chat or Slack have a free plan?
- Rocket.Chat has a free tier with limits, while Slack publishes a free plan (Free).
- What is the difference between Rocket.Chat and Slack?
- On the criteria we check, only Rocket.Chat has open source / self-hostable; both offer public api, mobile app and sso (saml). The table above lists every criterion side by side.