TL;DR: Microsoft Teams is the best free Slack alternative if your organization already pays for Microsoft 365. For data sovereignty, Mattermost or Rocket.Chat (both self-hostable) are the top picks. For the lowest paid price per seat, Chanty undercuts Slack significantly. All prices below were checked against each vendor's own pricing page as of September 2026 — SaaS pricing changes often, so treat these as a snapshot, not a guarantee.
Slack remains the most recognizable name in team messaging, but it is no longer the only credible option — and for many teams, it is no longer the cheapest or most practical one either. Whether you are chasing lower per-seat costs, need to keep data on your own infrastructure, or simply want deeper integration with the productivity suite you already pay for, there is a mature alternative built for that need.
Slack's own paid plans currently start at $7.25/user/month for Pro (billed annually) and $15/user/month for Business+ (billed annually) — Business+ pricing increased from its previous $12.50/user/month rate. The free plan caps message history at 90 days. Here is how seven alternatives compare, with every price checked directly against the vendor's own pricing page.
1. Microsoft Teams — Best Free Slack Alternative for Business
Pricing: A limited free tier is available. Microsoft 365 Business Basic, which includes Teams, is $7/user/month billed annually (up from $6/user/month previously — Microsoft raised prices in 2026). Paying month-to-month without an annual commitment costs more, around $8.40/user/month.
Microsoft Teams is the most direct Slack competitor with enterprise-grade features:
- Channels, threads, and DMs — the same basic structure as Slack
- Built-in video calls for large meetings (vs. Slack's separate Huddles)
- Office 365 integration — edit Word, Excel, and PowerPoint files inside Teams without leaving the app
- Copilot AI integration: meeting summaries, action items, and chat search
- Free tier: capped meeting duration and storage, no admin controls
Why switch from Slack to Teams? If your organization already pays for Microsoft 365, Teams is effectively free. The integrated file editing and SharePoint storage reduce the need for third-party file tools. For a 100-person remote team already on M365, dropping Slack Pro in favor of Teams still saves real money — though the exact savings depend on which Slack and Microsoft 365 tiers you compare.
Limitation: Teams' interface is more complex than Slack's. The channel/team hierarchy takes time to configure correctly. See our guide to Slack vs Microsoft Teams vs Discord for a deeper feature-by-feature breakdown.
2. Mattermost — Best Self-Hosted Slack Alternative
Pricing: Free forever for self-hosted, open-source deployments. Mattermost no longer publishes a flat per-seat price for its cloud/Professional tier on its own pricing page — plans are quoted directly by its sales team based on seat count and contract length, so request a quote before budgeting a specific figure.
Mattermost is the top choice for teams that need full data sovereignty:
- 100% open source — host on your own servers (AWS, Azure, GCP, on-premise)
- Slack-compatible API — migrate channels, message history, and integrations
- GDPR and HIPAA-friendly deployment options
- End-to-end encrypted messaging option
- Custom retention policies per channel
- GitLab, Jira, PagerDuty integrations
Best for: Healthcare, finance, government, and legal teams where data cannot leave company infrastructure. Also ideal for developer teams who want to customize their messaging stack.
Limitation: Self-hosting requires DevOps skills to run reliably, and Mattermost's cloud pricing is no longer a simple published number — you now have to talk to sales to get a quote.
3. Google Chat — Best for Google Workspace Teams
Pricing: Included with every Google Workspace plan. Business Starter is $7/user/month billed annually (up from $6/user/month previously); paying monthly without an annual commitment runs closer to $8.40/user/month.
Google Chat is deeply embedded in Google Workspace:
- Spaces (equivalent to Slack channels) with threaded conversations
- Direct integration with Gmail, Calendar, Meet, Drive, and Docs
- Gemini AI suggestions and smart replies
- @mention files from Google Drive directly in chat
- No separate login — same Google account as every other Workspace tool
Why switch? If your team lives in Google Docs and Gmail, Chat eliminates context-switching entirely. Gemini's integration adds smart meeting prep, action-item extraction from Spaces, and cross-document search.
Limitation: A smaller ecosystem of third-party integrations compared to Slack's app directory. For teams still deciding on a broader stack, our best collaboration tools for remote teams roundup covers how Chat fits alongside other Workspace tools.
4. Rocket.Chat — Best Open-Source Alternative with Slack Import
Pricing: A free, self-managed "Starter" tier is available for smaller deployments. Rocket.Chat's Commercial, Government, and Defense tiers are all quote-only on its own pricing page — no public per-seat figure is listed, so the "$7/user/month" figure sometimes cited elsewhere can no longer be confirmed against the vendor's own site and should not be relied on.
Rocket.Chat positions itself as the enterprise open-source Slack:
- Slack migration tool built in — imports channels, messages, and users
- Omnichannel support — handle customer chat (WhatsApp, Instagram, email) inside the same platform
- Marketplace with dozens of apps and bots
- Audio/video calls via WebRTC (self-hosted)
- On-premise deployment with Docker or Kubernetes
- End-to-end encryption for direct messages
Best for: Teams that want Slack-like UX with self-hosting and customer communication in one place. Get a direct quote from Rocket.Chat before comparing costs against Mattermost or Slack.
5. Discord — Best for Async and Voice-Heavy Remote Teams
Pricing: Free for servers of any size. Discord Nitro, an optional individual subscription (bigger uploads, HD streaming, custom profiles), is $9.99/month — a cheaper Nitro Basic tier is $2.99/month. Neither is required to run a team on Discord.
Discord started as a gaming platform but has become a legitimate async communication tool:
- Voice channels that stay open — no need to "start a call," just drop in
- Stage Channels for large town halls
- Threads on any message
- Forums channel type for long-form discussion
- Free for teams of any size
Best for: Creative teams, startups, and developer communities that value low-friction voice communication. Not ideal for formal business documentation or compliance-heavy industries.
Limitation: No native task management and no calendar integration — pair it with a dedicated planner like the tools in our dedicated project management tool guide if you need one.
6. Flock — Best Budget Alternative to Slack Pro
Pricing: Free for teams up to 20 members; Pro is $4/user/month (down from the $4.50/user/month figure previously advertised — Flock's own pricing page now lists $4/user/month for monthly billing).
Flock offers most of Slack's core features at a fraction of the price:
- Channels, DMs, video calls — all standard features
- Built-in to-do list and shared notes
- Polls, reminders, code snippets natively in chat
- $4/user/month vs. Slack Pro's $7.25/user/month — roughly 45% cheaper
Best for: Budget-conscious SMBs that need Slack-like functionality without the enterprise price tag.
7. Chanty — Best AI-Powered Messaging for Small Teams
Pricing: Free for up to 5 team members (Chanty's free tier limit was reduced from the 10-member cap it previously offered). Business is $3/user/month billed annually, or $4/user/month billed monthly.
Chanty is one of the most affordable options for small remote teams:
- Unlimited message history on the free plan (Slack limits free workspaces to 90 days)
- Teambook — a unified view of tasks, pinned messages, and files
- AI-powered message search across all history
- Built-in task manager (Kanban view)
- $3/user/month annual billing — one of the cheapest paid Slack alternatives on this list
Best for: Freelancer teams and startups under 15 people who hit Slack's 90-day message limit on the free plan. For teams weighing a full project-management switch as well, see our best project management software comparison.
Slack Alternative Comparison: Pricing Summary (as of September 2026)
Every figure below was checked against the vendor's own pricing page in September 2026. Where a vendor no longer publishes a public per-seat price, that is noted instead of guessing.
| Tool | Free Tier | Paid From | Self-Hosted |
|---|---|---|---|
| Microsoft Teams | Limited free tier | $7/user/mo (M365 Business Basic, annual) | No |
| Mattermost | Free (self-hosted) | Quote-only (not published) | Yes |
| Google Chat | Workspace free trial only | $7/user/mo (Business Starter, annual) | No |
| Rocket.Chat | Free self-managed Starter | Quote-only (not published) | Yes |
| Discord | Unlimited (free) | $9.99/mo (Nitro, optional, individual) | No |
| Flock | Up to 20 members | $4/user/mo | No |
| Chanty | Up to 5 members | $3/user/mo (annual) | No |
| Slack (for reference) | 90-day message history | $7.25/user/mo (Pro, annual) | No |
Which Slack Alternative Should You Choose?
The best Slack alternative for your remote team in 2026 depends on your existing stack: Microsoft Teams if you're on M365, Google Chat if you're on Workspace, Mattermost or Rocket.Chat if data sovereignty is critical. For pure cost savings, Chanty ($3/user/month annual) and Flock ($4/user/month) offer most of Slack's day-to-day functionality at a fraction of the price. One consistent advantage across this list: every alternative here offers unlimited message history on its paid tier — Slack only unlocks that from its $7.25/user Pro plan up. If video is your primary use case rather than chat, also check our best video conferencing software comparison.
Frequently Asked Questions
- What is the best free Slack alternative for remote teams in 2026?
- Microsoft Teams is the best free Slack alternative for remote teams in 2026 for organizations already on Microsoft 365 — it comes bundled with the M365 Business Basic plan, currently $7/user/month billed annually. Its standalone free tier has capped meeting duration and storage. Google Chat is a comparable option for teams on Google Workspace.
- Is Microsoft Teams better than Slack for remote teams?
- Microsoft Teams is a strong choice if your team already uses Microsoft 365 (Word, Excel, SharePoint) — the deep file integration and built-in video calls make it a more complete platform for that stack. Slack is often preferred for its larger third-party app marketplace and a more focused messaging interface. Pricing is close: Slack Pro is $7.25/user/month versus $7/user/month for M365 Business Basic, both billed annually.
- Can you self-host a Slack alternative?
- Yes — Mattermost and Rocket.Chat are the two leading self-hosted Slack alternatives. Both are open source, support Docker/Kubernetes deployment, and offer Slack-compatible APIs for migration. Neither currently publishes a flat per-seat cloud price on its own site, so request a quote if you want a managed option instead of self-hosting.
- What is the cheapest paid Slack alternative in 2026?
- Chanty is the cheapest paid Slack alternative confirmed on this list, at $3/user/month billed annually ($4/user/month billed monthly), with a free plan for teams up to 5 members. Flock follows at $4/user/month. Always confirm current pricing directly on the vendor's site before switching, since SaaS pricing changes frequently.
