The bottom line
Has Slack’s free plan eaten your team’s message history? The 90-day rolling deletion is the single biggest reason small teams, small businesses, and freelancers start looking for an alternative — and it is the lens this guide is written through.
For most teams, Discord is the best free Slack alternative: unlimited message history, unlimited integrations, free video and voice calls, and a channel structure that feels familiar enough for everyday work. If you are already inside the Microsoft or Google ecosystem, Teams free and Google Chat are the more natural drop-in replacements. Slack’s paid plans are worth keeping only if you depend heavily on third-party app integrations or enterprise compliance features — for everyday team communication, the free alternatives below cover the job completely.
The rest of this guide walks through five free alternatives that handle that core team-chat job without the 90-day cap, and flags the practical tradeoffs each one carries — interface adjustment, file size limits, integration breadth, or operational overhead — so you can pick the one that actually fits your team rather than the one with the longest feature list.
Why teams look for a free alternative to Slack
Slack’s free plan was substantially more useful before it restricted message history to 90 days in 2022. Before that change, many small teams lived on the free plan indefinitely. Now, the 90-day limit means that conversations, decisions, and shared files disappear from view on a rolling basis — which fundamentally breaks the promise of a searchable team communication record.
The other limitation is integrations. Slack free allows only 10 active integrations, which forces teams to choose between the tools they connect. For any team using GitHub, Google Drive, Jira, and a few other services simultaneously, 10 slots run out quickly.
The commercial reality is also straightforward: for a team of 10 people, Slack Pro costs $80 per month. That is a meaningful recurring cost for a small business or startup that primarily needs a place to send messages and share files — both of which can be done for free with the right tool.
The best free Slack alternatives in 2026
1. Discord — best overall free Slack alternative for most teams
Discord is a voice, video, and text communication platform originally built for gaming communities, now widely adopted by remote teams, startups, and creator businesses.
Unlike Slack’s free tier, Discord doesn’t roll messages off after 90 days, doesn’t cap integrations at 10, and doesn’t time-limit video or voice calls. The free experience covers unlimited message history, unlimited channels organised into servers, unlimited integrations and bots, unlimited video and voice calls, file sharing, screen sharing, reactions, threads, forum channels for organised discussions, and clients for Windows, macOS, Linux, iOS, and Android. On every metric that matters for everyday team communication, Discord’s free plan is more capable than Slack’s free plan.
The tradeoffs are smaller but real. Video quality is capped at 720p (1080p requires Nitro), file uploads are limited to 10MB per file on free, some server customisation features require Nitro, and the interface takes adjustment for teams used to Slack’s workspace structure. The learning curve is genuine — Discord uses “servers” instead of “workspaces” and feels slightly more casual — but for teams willing to spend an afternoon on setup, the capability gap is significant.
A natural fit for startups, remote teams, developer teams, creative agencies, and any small team that wants unlimited message history and integrations without a monthly subscription.
Setting up Discord for a work team: The biggest practical hurdle is that Discord’s default interface looks like a gaming platform, which creates friction when onboarding colleagues who have not used it before. A few setup decisions reduce that friction immediately: name the server after your company or project rather than leaving a default name, create channels that mirror your existing Slack channel structure (#general, #projects, #random), and disable the server’s public discoverability so it is invite-only. With those steps in place, new team members find the interface much less disorienting than they expect. The 10MB file upload limit on free is worth flagging upfront — teams that regularly share large design files or video clips will hit it. For those workflows, a shared Google Drive folder linked from Discord channels is the common workaround.
For teams also looking for dedicated meeting tools for more formal client calls, see our free Zoom alternatives guide.
2. Microsoft Teams free — best for teams in the Microsoft ecosystem
Microsoft Teams free is Microsoft’s workplace communication and collaboration platform with a free tier covering core messaging and meeting features.
Compared with Slack’s free plan, Teams free trades third-party integration breadth for native Microsoft 365 integration. The free experience includes unlimited group and 1:1 messages with full search history, group video calls up to 60 minutes with up to 100 participants, file sharing with cloud storage per user, screen sharing, background blur, integration with Microsoft 365 web apps, and clients for Windows, macOS, iOS, and Android.
The constraints to plan around: a 60-minute group call time limit (fine for standups and client check-ins, awkward for workshops or long reviews), meeting recordings sit behind a Microsoft 365 subscription, advanced admin controls and compliance features are paid-only, and the experience is thinner than full Teams inside a Microsoft 365 organisation.
Teams free is the most natural Slack replacement for organisations already invested in Microsoft’s ecosystem. The persistent channel structure, file sharing via OneDrive, and integration with Office web apps create a coherent collaboration environment. If your team already stores files in OneDrive and keeps meetings short, Teams is efficient; if the chat tool needs to be lightweight and independent from Microsoft accounts, Discord or Google Chat will feel easier.
3. Google Chat — best for teams already using Google Workspace
Google Chat is Google’s team messaging platform, integrated with Gmail, Google Drive, Google Meet, and the rest of the Workspace suite.
Unlike Slack, Google Chat requires no adoption effort for Google Workspace users — it is already embedded inside Gmail and accessible from any browser, mobile device, or the Gmail web app. The free experience covers unlimited direct and group messages with searchable history, Spaces (persistent channels for team topics), and integration with Google Drive, Docs, Sheets, and Meet.
The compromise compared with Slack or Teams is breadth: fewer third-party integrations, less feature-rich automation for bots and workflows, more limited guest access for external collaborators, and a deliberately simpler interface that is less suited to complex team workflows.
The natural choice for teams already using Gmail and Google Workspace, where Chat feels like an extension of existing workflows rather than a new tool to adopt. If your team lives in Gmail, Google Drive, and Google Docs, Chat is already embedded in those interfaces. Starting a conversation from a shared Google Doc, jumping to a Meet call, and storing files in Drive all happen without context-switching to a separate app. For teams that do not need deep third-party integrations, the zero-friction integration with existing tools outweighs what Chat lacks compared to Slack.
4. Mattermost free tier — best open-source option for teams who want data control
Mattermost is an open-source messaging platform modelled closely on Slack, available as a cloud-hosted free tier or a self-hosted installation on your own server.
Compared with Slack, Mattermost is the closest thing to a self-hosted equivalent that exists. The interface is familiar to Slack users — channels, threads, reactions, and full-text search all work in a similar way — and apps cover Windows, macOS, Linux, iOS, and Android. On a self-hosted deployment you get unlimited message history, channels, direct messages, threads, file sharing, incoming webhooks, basic integrations, and full data ownership because your messages never leave your infrastructure.
The constraints divide cleanly. The cloud-hosted free tier has feature limitations. Advanced admin features and compliance tools require a paid Enterprise plan. The integration marketplace is smaller than Slack’s. Self-hosting itself requires technical setup, server costs, and ongoing maintenance.
The natural audience: developer teams, companies with data residency requirements, privacy-conscious organisations, and technical teams who want full control over their communication data. Mattermost is the closest thing to a self-hosted Slack that exists. The interface is familiar to Slack users — channels, threads, reactions, and search all work in a similar way. The key differentiator is data ownership: when you self-host Mattermost, your messages never leave your infrastructure. For companies in regulated industries or teams handling sensitive client data, this is a meaningful advantage that no SaaS-only tool can offer.
5. Rocket.Chat free — best self-hosted option with the most features
Rocket.Chat is an open-source team communication platform with an extensive feature set, available as a cloud-hosted service or self-hosted installation.
Unlike Slack’s tightly scoped free tier, Rocket.Chat’s self-hosted deployment is the most feature-complete free team communication tool available. On a self-hosted install you get unlimited users and message history, channels, direct messages, discussions, threads, video conferencing via Jitsi integration, hundreds of app integrations covering most major development, project management, and productivity tools, an end-to-end encryption option, and mobile and desktop apps across all platforms.
The tradeoffs are higher operational cost. The cloud-hosted free tier is limited to 1,000 messages per month. Advanced compliance and audit features sit behind paid plans. Self-hosting requires server setup, ongoing maintenance, and more configuration work than the other options in this list.
The natural fit: technical teams who want maximum features on a self-hosted deployment, organisations that need end-to-end encryption, and teams that have outgrown Mattermost’s feature set. The trade compared to Mattermost is higher setup complexity in exchange for the broadest feature set at zero software cost. The integration library covers most major development, project management, and productivity tools. End-to-end encryption is available for sensitive conversations. The trade-off compared to Mattermost is higher setup complexity — but for teams with technical capacity to manage it, the breadth of features at zero software cost is unmatched.
Quick comparison table
| Tool | Message history | Integrations | Video calls | Best for |
|---|---|---|---|---|
| Discord | ✅ Unlimited | ✅ Unlimited | ✅ Unlimited | Most teams — best overall |
| Microsoft Teams | ✅ Unlimited | ✅ Good | ⚠️ 60 min groups | Microsoft 365 users |
| Google Chat | ✅ Unlimited | ⚠️ Limited | ✅ Via Meet | Google Workspace users |
| Mattermost | ✅ Unlimited (self-hosted) | ✅ Good | ⚠️ Via plugin | Data control, devs |
| Rocket.Chat | ✅ Unlimited (self-hosted) | ✅ Extensive | ✅ Built-in | Max features, technical teams |
| Slack free | ⚠️ 90 days only | ⚠️ 10 max | ⚠️ Limited | Existing Slack users only |
Common mistakes when switching from Slack
Migrating channels but not habits. The most common reason a Slack alternative fails within a team is that the tool moves but the norms do not. If Slack’s culture was that every question went to a team-wide channel and everyone expected a fast reply, that expectation does not automatically transfer to Discord or Teams. The first week of a new tool is the time to set clear expectations about response time, which channels are for which topics, and whether the team’s old Slack archive is still accessible for reference. Without that reset conversation, the new tool quickly feels disorganised.
Choosing self-hosted without accounting for maintenance. Mattermost and Rocket.Chat are genuinely compelling at zero software cost, but “free” here means free to license — not free to run. A self-hosted deployment requires a server (which has a monthly cost), someone to handle updates and backups, and a plan for what happens when the server goes down outside office hours. For a small team without technical staff, that ongoing operational overhead is likely higher than the cost of a Slack subscription. Self-hosted is the right call for organisations with data residency requirements or a dedicated IT team — for others, it trades one monthly bill for a different kind of ongoing cost.
Switching during a high-pressure period. The first two weeks on a new communication tool always include friction: people miss channels, forget to check the new app, or fall back to email. Running a tool switch during a product launch, a client deadline, or a hiring sprint multiplies that friction at exactly the wrong moment. A quieter week — ideally with a parallel test period where both tools are running — reduces the disruption significantly.
Who should still pay for Slack?
Slack Pro and Business+ make the most sense for larger teams where the depth of the integration ecosystem is genuinely in use. Slack has the largest marketplace of third-party app integrations of any team communication tool — if your team depends on Salesforce, ServiceNow, or complex custom workflow automations built on Slack’s API, the switching cost to a free alternative can outweigh the subscription cost.
Enterprise compliance requirements are the other strong argument for Slack paid. Data retention policies, eDiscovery, audit logs, and SSO integrations are available on Slack’s Business+ and Enterprise Grid plans at a level that free tools cannot always match with the same reliability and support guarantees.
For organisations where Slack is deeply embedded in customer support workflows — using Slack Connect to communicate with external clients and vendors — the network effect of staying on Slack makes sense. Asking external contacts to switch to Discord or Mattermost creates friction that may cost more in relationship management than the subscription saves.
Putting it together
For most small teams and startups, Discord is the honest answer to expensive Slack plans — unlimited history, unlimited integrations, and free video calls at zero cost. If your team is already inside Google or Microsoft’s ecosystem, Google Chat and Microsoft Teams free are the path of least resistance with no new tools to learn. For teams that need full data sovereignty, Mattermost self-hosted provides the closest experience to Slack at zero software cost. Slack Pro is worth paying for only when your team’s workflow is built around deep third-party integrations or enterprise compliance requirements that free tools genuinely cannot meet. For scheduling meetings and coordinating time across your team, see our best free calendar apps guide. For shared documents, spreadsheets, and presentations around those conversations, pair your chat setup with our free Microsoft Office alternatives guide.
