Slack

Channel-based messaging for work.

Verified facts: 3 of 3
Alternatives ranked: 15
Approved reviews: 0
Visits sent from here: 0

About Slack

Slack organizes team communication into channels by topic, project or team, alongside direct messages, threads and audio huddles. Thousands of integrations bring alerts and actions from other tools into conversations, and Workflow Builder automates routine requests. Slack Connect lets companies share channels with partners and customers. It is owned by Salesforce. The free plan limits how much message history you can see, which is a frequent reason small teams and communities look for alternatives, while paid plans unlock full history, more integrations and administration controls.

Best for: Companies that want the largest integration ecosystem for chat.

What works

Huge integration ecosystem
Polished threads and huddles
Shared channels with other companies

Why people leave

Free plan hides older message history
Costs rise quickly per seat

Top Slack alternatives

See all 15

1
Discord
Free with unlimited message history and excellent voice channels.
64.8
2
Microsoft Teams
Often included in Microsoft 365 plans, with stronger meetings.
56.0
3
Zulip
Topic-threaded chat that's easier to follow asynchronously, open source.
55.9
4
Mattermost
Open-source, self-hosted chat with a familiar Slack-like interface.
54.8
5
Rocket.Chat
Self-hosted chat with omnichannel customer messaging built in.
50.5

Why people left Slack

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

No switching stories yet. If you moved away from Slack, review the app you switched to and tell us why.

Reviews

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Slack: common questions

Is Slack free?

Slack has a free plan and paid plans. Free plan: Yes, with limited history (checked on Slack's own site).

Is Slack open source?

No, Slack is not open source. Open-source alternatives include Zulip, Mattermost and Rocket.Chat.

What platforms does Slack run on?

Slack is available for Web, Windows, macOS, Linux, iOS and Android.

What are the best alternatives to Slack?

The highest-ranked Slack alternatives right now are Discord, Microsoft Teams and Zulip. See the full ranked list for pricing, platforms and verified facts.

See all 15 Slack alternatives

Slack facts

3 of 3 verified

Free plan: Yes, with limited history; Checked Oct 24, 2026slack.com(opens source in a new tab); “Or start with the basics for free, and upgrade at any time.”
Owner: Salesforce; Checked Oct 24, 2026slack.com(opens source in a new tab); “AI Save time with built-in AI Agentforce Team up with Salesforce agents CONNECT Apps & Integrations Connect your favorite”
Platforms: Web, desktop, mobile; Checked Oct 24, 2026slack.com(opens source in a new tab); “Downloads | Slack Skip to main content Product COLLABORATE Channels”