What is Slack? (Complete Guide + 2025 Reviews)

Slack Is a collaborative communication platform designed for businesses of all sizes, from startups to large corporations. It centralizes conversations, tools, and files in one place, simplifying teamwork.

Its promise is simple: replace internal emails to offer faster, better organized, and more effective communication. In 2025, Slack is establishing itself as an essential productivity hub, now integrating features ofartificial intelligence to optimize workflows even more.

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What is Slack for? (Use case)

Slack is used to streamline internal communication and connect teams no matter where they are. It is a digital workspace where conversations are organized into thematic channels, by project, by team, or by subject.

The main benefit for users is considerable time savings and improved information transparency. For a small business, Slack allows you to keep all employees in sync. For an e-commerce company, it can centralize order alerts and customer support. For a tech company, it becomes the nerve center of development, bug reports, and deployments.

The key features of Slack

Slack is packed with features designed to improve productivity and collaboration.

• Channels: Organize conversations by project, department, or topic to keep everyone informed without being overwhelmed with irrelevant information.
• Slack Connect: Collaborate with external partners, customers, or suppliers in a shared channel as easily and securely as internally.
• Audio and video calls (Huddles): Start impromptu audio or video meetings directly from a channel to quickly discuss a topic, with the ability to share your screen.
• Workflow generator: Automate tasks and repetitive processes without writing a single line of code, like routine reports or welcome messages.
• Slack AI: Take advantage of AI-generated channel summaries, discussion threads, and meeting notes to catch up quickly.
• Powerful search: Instantly find messages, files, or people, even in a rich history, so you never lose important information.

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Advantages and limitations of Slack

Like any tool, Slack has strengths and a few weaknesses to consider.

✅ Advantages:

• Centralization of communication: No more scattered emails, everything is grouped, organized, and accessible.
• Powerful integrations: Slack connects to thousands of other tools (Google Drive, Jira, Salesforce, etc.), which makes it a real control station.
• Intuitive interface: The tool is recognized for its ease of use and its quick handling by new teams.
• Flexibility and customization: From channels to notifications, each user can adapt Slack to the way they work.

❌ Limits:

• The cost: Paid plans can represent a significant budget for large teams, although the free version is already very functional.
• Risk of information overload: Without well-organized channels and notifications, Slack can become noisy and distracting.
• Connection dependency: As a cloud tool, a stable internet connection is essential for its proper functioning.

How much does Slack cost? (Prices 2025)

Slack offers several pricing plans to adapt to the needs of each business. Prices are generally charged per user per month.

• Free package: Ideal for small teams who want to test the tool. It includes access to the last 90 days of message history and up to 10 app integrations.
• Pro package: Starting at €6.75 per user/month (annual billing). This plan unlocks unlimited message history, group calls for up to 50 participants, unlimited integrations, and AI features like chat summaries.
• Business+ package: Starting at €15 per user/month (annual billing). It adds advanced security and compliance features, like single sign-on (SSO) and a 99.99% uptime guarantee.
• Enterprise+ package: The rate is only available on estimate. This plan is designed for very large businesses or those operating in regulated industries, offering enhanced security, centralized administration for multiple workspaces, and enterprise-grade compliance.

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Our opinion on Slack (Test & Recommendations)

Our Slack experience has been extremely positive. The tool is really transforming the way teams collaborate on a daily basis. Its greatest strength lies in its ability to break information silos and make communication more direct and transparent.

The main strength we observed was the drastic reduction in the volume of internal emails, which frees up time and mental load. The practical limit remains the need for team discipline to keep channels well-organized. We definitely recommend Slack for businesses looking to boost their internal communication, especially teams working remotely or across multiple sites.

Final grade: 4.5/5

Alternatives to Slack

While Slack is a leader, there are other great tools out there.

• Microsoft Teams: The best alternative for businesses already integrated into the Microsoft 365 ecosystem, offering deep native integration.
• Google Chat: A solid and simple option for organizations that use Google Workspace extensively.
• Discord: Initially designed for gamers, Discord has become a flexible and often less expensive alternative that is appreciated by many communities and businesses.

Integrations available with Slack

The strength of Slack also lies in its ecosystem of integrations. You can connect most of your professional tools directly to Slack to centralize notifications and actions

We find native integrations for CRM tools (Salesforce), of project management (Jira, Asana, Trello), file storage (Google Drive, dropbox), and much more. In addition, thanks to its compatibility with automation platforms suchlike Zapier and Make, as well as a robust API, the connection possibilities are almost endless.

How do I get started with Slack? (Quick guide)

Getting started on Slack is a quick and easy process.

1. Create your workspace: Go to the official Slack site and create an account with your business email address.
2. Set up your first channels: Create discussion channels for your main projects, teams (#marketing, #projet -alpha), and general topics (#annonces, #général).
3. Invite your collaborators: Add team members to the workspace so they can join the conversations.
4. Connect your tools: Explore the Slack App Directory and add a few of your most used apps to start getting notifications.
5. Download the app: Install desktop and mobile apps to stay connected no matter where you are.

Do you want to integrate Slack in an advanced way into your business processes? The TurnK team can support you in setting up automated workflows and custom integrations. Contact us to discuss.