This review covers what Slack is today: product overview, core and advanced features (including AI and Agentforce), integrations, pricing, pros and cons, how it compares to Microsoft Teams and Google Chat, user experience, ratings, who it fits, real customer stories, and what to watch in the future.
Quick overview
| Dimension | Details |
|---|---|
| Overall rating | ★★★★☆ 4.5/5 |
| Core strengths | Channels, Slack Connect, AI (Slackbot, summaries, search), Workflow Builder, 2,600+ apps, Agentforce in paid plans |
| Starting price | Free; Pro $7.25/user/month (annual) |
| Free plan | Yes (90-day history, 10 apps, basic AI) |
| Best for | Tech and product teams, startups, companies using a mixed SaaS stack who want one place for chat, tools, and AI |
| Website | slack.com |
Product overview
What Slack is
Slack is a team collaboration and AI work platform. Work happens in channels (public or private), direct messages, and—increasingly—with AI and agents (Slackbot, Agentforce, third-party apps). You can message people, share files, run huddles (audio/video and screen share), use Canvas and Lists for docs and tasks, and automate work with Workflow Builder. Slack Connect extends the same experience to external partners via DMs, group chats, or shared channels (up to 250 orgs on paid plans).
The company’s tagline—“your team’s collective brain”—reflects the shift from “chat app” to knowledge and action hub: search, summaries, and AI are built in so you can find context and get things done without leaving Slack. After Salesforce acquired Slack in 2021, the product has integrated Salesforce in Slack and Agentforce: CRM data and AI agents are available in the same flow of work.
Who uses Slack
Slack is used by teams of all sizes and across industries. Typical users include engineering, product, marketing, sales, customer service, and operations. Slack’s own positioning highlights solutions by department (e.g. Engineering, IT, Customer Service, Sales, Marketing, HR, Security) and by industry (Technology, Financial Services, Retail, Healthcare, Education, Public Sector, and others). The platform is especially common in tech companies and startups, where channel-based communication and deep integrations are the norm. As of 2025, Slack reported roughly 47.2 million daily active users, 79 million monthly active users, 750,000+ organizations, and 200,000 paid customers; about 77% of the Fortune 100 use Slack (figures from public sources and Slack marketing; exact numbers may vary by date).
History and company
Slack started in 2013 as an internal tool at Tiny Speck, a studio building the game Glitch, founded by Stewart Butterfield and Cal Henderson. When Glitch was shut down, the team turned that internal chat tool into a product and launched Slack in 2014. Growth was fast: thousands of signups on day one and quick adoption by tech teams. Over the next several years Slack added channels, integrations, search, and later huddles, Canvas, Lists, and AI.
Salesforce completed its acquisition of Slack in July 2021. Slack now operates as part of Salesforce. Product development has continued with a strong focus on AI in Slack (summaries, Slackbot, AI search, workflow generation), Agentforce (AI agents that can take actions in Slack), Enterprise Search, and tighter Salesforce integration. Revenue has grown significantly post-acquisition; 2023 revenue was reported around $1.7 billion, with 2025 estimates in the range of several billion (public estimates; confirm with official filings).Market position
Slack is one of the leading team messaging and collaboration products globally. Its main rivals are Microsoft Teams (bundled with Microsoft 365) and Google Chat (part of Google Workspace). Slack differentiates on integrations (2,600+ apps, 1.7M apps in active use weekly, per Slack), AI built into the product (Slackbot, Agentforce, enterprise search), channel-centric design, and flexibility for teams that use many different tools. G2 and other review sites consistently rank Slack highly; for example Slack has been cited as a leader in multiple G2 market reports (e.g. work management, workflow management, business instant messaging). It remains the default choice for many tech and product-led organizations.
Core features
Channels and messaging
Channels are the main unit of work in Slack. You create public channels (open to the whole org) or private channels (invite-only). Each channel has a topic, optional description, and—on paid plans—configurable posting permissions (e.g. who can post or @mention everyone). Direct messages support 1:1 and group DMs. Threads keep side discussions attached to a message so the main channel stays readable. Reactions, mentions, rich formatting, and file sharing (images, documents, links) are standard. This structure makes it easy to separate by team, project, or topic and to bring the right people and context together.Slack Connect
Slack Connect lets you work with people outside your organization in Slack. On Free you get 1:1 external DMs. On Pro and above you get group external messages and shared channels with up to 250 organizations. You can chat with clients, vendors, or partners in real time instead of email, with messages and files in one place. Security and compliance controls (e.g. DLP for external content on higher plans) apply to Connect as well.Huddles and Clips
Huddles are Slack’s built-in audio and video meetings. You can start a huddle in a channel or DM; participants join with audio/video and screen sharing. On Free, huddles are 1:1; on Pro and above you get group huddles. With AI in Slack, huddle notes (transcripts, takeaways, action items) can be generated automatically so you don’t have to leave the conversation to take notes. Clips are short audio or video recordings you can share in channels or DMs. You record a quick update or explanation and post it so others can watch or listen when they’re ready—useful for async communication across time zones.Canvas and Lists
Canvas is a place to create and share rich content inside Slack: text, files, images, videos. You can use it for specs, briefs, runbooks, or any doc that lives next to the conversation. On Business+ and above, AI writing assistance in Canvas helps structure and polish content. Lists let you manage tasks and projects without leaving Slack. You can create lists in channels, assign owners, set due dates, and track status. Together with Canvas and channels, Lists supports lightweight project and knowledge management inside the same workspace.Search
Slack’s search covers messages, files, and—on paid plans—people and channels. You can filter by channel, person, date, and file type. AI search (included across plans) lets you ask a question in natural language and get answers from your conversations and shared files. On Enterprise+, Enterprise Search extends search to connected apps, databases, and systems so you can find information across your tech stack from one place.
Workflow Builder and automation
Workflow Builder lets you automate routine tasks without code. You define triggers (e.g. emoji reaction, form submission, schedule) and steps (send a message, create a channel, call an app). Conditional branching and custom workflow steps (via APIs) allow more complex flows. AI workflow generation uses a prompt to suggest or build workflows. Slack reports high usage of workflows (e.g. millions of workflows run daily; exact numbers from Slack). Automation reduces repetitive work and keeps processes consistent.Advanced features and AI
AI in Slack
Slack has integrated AI across the product. Capabilities vary by plan:
- Thread and channel summaries – Catch up on long threads or channels with one click; you get a concise summary instead of reading every message.
- Slackbot – A personal AI agent that understands your conversations, files, and projects in Slack. It can help organize your day, answer questions, and surface relevant context. Plan limits apply on higher tiers.
- AI search – Type a question in the search bar; AI returns answers grounded in your org’s messages and files.
- Daily recaps – A digest of what’s happening across your teams and projects.
- File summaries – AI summaries of shared documents so you can “catch up” on files quickly.
- AI workflow generation – Describe what you want in plain language; AI suggests or builds Workflow Builder workflows.
- AI steps in Workflow Builder – Use AI in workflows (e.g. channel summaries for daily or weekly recaps).
- AI message explanations – Get explanations of acronyms, projects, or jargon based on your team’s conversations.
- AI writing assistance in Canvas – On Business+ and above, AI helps create, structure, and polish Canvas content.
- Enterprise search – On Enterprise+, search across connected apps and systems, not just Slack.
Slack states that AI runs in its own infrastructure, that customer data is not used to train third-party LLMs, and that existing security and compliance practices apply to AI features. Internal pilot data cited by Slack suggested users could save significant time weekly (e.g. on the order of tens of minutes) with AI features; actual impact will vary by team and usage.
Agentforce in Slack
Agentforce is Salesforce’s digital labor platform; it is now integrated into Slack. Agentforce agents can be @mentioned in channels and DMs, or discovered via the Agentforce Hub (by skill set: sales, service, marketing, IT, HR, etc.). Agents can use Slack Actions to do things on your behalf, for example:- Create or update Canvases (e.g. account plans, proposals, incident reports).
- Send direct messages to teammates.
- Look up users and connect colleagues.
Agentforce can use conversational and permissioned data from channels, lists, and canvases to give contextually relevant answers. It is available on all paid Slack plans without a separate add-on (as of Slack’s 2025 announcements; confirm current packaging). This makes Slack a place where both humans and AI agents collaborate in the same channels.
Security and compliance
Slack provides encryption in transit and at rest, two-factor authentication, session duration controls, and native device management (e.g. block jailbroken devices, control file downloads). SAML-based SSO is available on Pro and above (multiple SAML configs on Enterprise+); SCIM supports user provisioning. Slack Enterprise Key Management (EKM) allows you to hold your own encryption keys (add-on). Data retention, data residency, audit logs, compliance exports, legal hold, information barriers, and HIPAA-eligible configuration are available on higher tiers. Native data loss prevention (DLP) can scan external messages and files. These options make Slack suitable for regulated and enterprise environments when configured appropriately.
Integrations
Slack’s App Directory lists 2,600+ apps (as of 2026; check slack.com for current count). Integrations span:
- Productivity and collaboration – Google Drive, Dropbox, Box, OneDrive, Notion, Confluence, Asana, Monday, Jira, Trello, etc.
- CRM and sales – Salesforce (deep integration: Salesforce in Slack, Agentforce), HubSpot, Pipedrive, Outreach, etc.
- Development – GitHub, GitLab, Bitbucket, Jenkins, Vercel, Sentry, and many others.
- Communication – Zoom, Microsoft Teams (for coexistence), Calendly, etc.
- AI and agents – ChatGPT, Claude, and other AI apps and agents that can be added to channels.
- Custom – Slack APIs, Bolt, and Workflow Builder let you build custom integrations and automate with your own systems.
Slack also supports Slack Connect for cross-org collaboration and deploying apps to Slack’s infrastructure (hosted functions) so you can run custom logic without managing servers. The combination of out-of-the-box apps and custom workflows makes Slack a central hub for many teams’ toolchains.
pricing
Slack has four main plans: Free, Pro, Business+, and Enterprise+. Pricing below is as of 2026 from slack.com/pricing; confirm current rates and regional differences on the site.
Free
$0, free forever.- Message history: 90 days (then only the last 10,000 messages searchable).
- Apps: Up to 10 from the App Directory.
- Huddles: 1:1 audio/video and screen share.
- Slack Connect: 1:1 external DMs only.
- Basic AI: Conversation summaries, Slackbot, AI workflow generation, AI search, daily recaps, file summaries.
- Security: OAuth with Google; no SSO.
- Workspaces: 1.
- Support: Standard self-serve and community.
Free is enough for small teams or try-before-you-buy; the 90-day history and 10-app limit are the main constraints.
Pro
$7.25 per user/month when billed annually ($8.75 when billed monthly). Often offered with a 50% discount for the first 3 months (terms apply).- Message history: Unlimited.
- Apps: Unlimited integrations.
- Huddles: Group audio/video and screen share.
- Slack Connect: Group DMs and shared channels (up to 250 orgs).
- Basic AI: Same as Free (summaries, Slackbot, AI search, recaps, file summaries).
- Security: SAML SSO, SCIM, EMM, session duration, device management, access logs.
- Compliance: Data retention, exports, DLP for external content.
- Workspaces: 1.
- Support: 24/7.
Pro is the standard plan for teams that need full history, many integrations, and SSO.
Business+
$15 per user/month annually ($18 monthly). Often 50% off for the first 3 months (terms apply).- Everything in Pro, plus:
- Advanced AI: Slackbot with higher plan limits, AI message explanations, AI writing in Canvas, AI steps in Workflow Builder.
- SSO: Multiple SAML configurations.
- Compliance: Compliance exports and stronger admin controls.
- Support: 24/7 priority with 4-hour first response time.
Business+ is for organizations that want more AI and stricter security and compliance.
Enterprise+
Custom pricing (contact sales).- Everything in Business+, plus:
- Enterprise Search: Search across connected apps, databases, and systems.
- Workspaces: Unlimited.
- Templates: Publish custom templates company-wide.
- Security: Slack EKM (add-on), HIPAA-eligible configuration, legal hold, information barriers, anomaly-based session response.
- Administration: Granular roles, manage flagged content, etc.
- Support: Dedicated success and 24/7 priority.
Enterprise+ targets large enterprises with complex compliance and governance needs.
Billing and discounts
- New users: Prorated for the remainder of the current billing period.
- Inactive users: Slack’s fair billing policy treats a user as active if they take any action in Slack within 28 days; inactive paid seats receive a prorated credit.
- Payment: Credit card; annual plans may be eligible for invoice (ACH/wire)—see Help Center.
- Nonprofits and education: Discounts for qualified organizations; apply via Slack’s Help Center.
Pricing and packaging have been updated over time (e.g. June 2025 changes bundled more AI into plans and adjusted Business+ and Enterprise+). Always confirm current plans at slack.com/pricing.
Pros and cons
Pros
- Channel-based organization – Clear structure by team, project, and topic; threads and permissions keep channels readable and under control.
- Integrations – 2,600+ apps and strong APIs; Slack becomes the hub for notifications, workflows, and context from other tools.
- AI in the flow of work – Summaries, Slackbot, AI search, and Agentforce reduce context-switching and help people catch up and take action without leaving Slack.
- Slack Connect – Collaborate with external partners in Slack instead of email; group DMs and shared channels on paid plans.
- Search – Powerful message and file search plus AI-powered answers; Enterprise Search on Enterprise+ extends this across systems.
- Workflow Builder – Accessible automation without code; AI workflow generation and AI steps make it easier to build and maintain workflows.
- Salesforce and Agentforce – CRM data and AI agents in Slack for sales, service, and other use cases, on paid plans without a separate AI add-on.
- Adoption and trust – Widely used and well rated; strong security and compliance options for enterprises.
Cons
- Cost at scale – Per-seat pricing can add up for large organizations; Teams or Chat can be cheaper when already bundled with Microsoft 365 or Google Workspace.
- Free plan limits – 90-day history and 10 apps may be too restrictive for teams that need long-term search or many integrations.
- Noise – Without good channel discipline and notifications settings, busy workspaces can feel overwhelming.
- Learning curve for power features – Workflow Builder, Canvas, Lists, and admin settings take time to master.
- Dependency – Centralizing communication in Slack means outages or policy changes have broad impact; some organizations prefer to diversify.
Competitor comparison
Slack vs Microsoft Teams
- Slack: Strongest in integrations, channel design, and AI/agents; works well with mixed SaaS stacks; often preferred by tech and product teams.
- Teams: Bundled with Microsoft 365; deep integration with Office, SharePoint, OneDrive, and Outlook; strong for organizations that standardize on Microsoft.
Slack vs Google Chat
- Slack: Richer third-party integrations, more automation, and a broader “work OS” and AI story (Slackbot, Agentforce, enterprise search).
- Google Chat: Lightweight, native to Google Workspace (Drive, Docs, Calendar, Meet); simpler and lower cost when you’re all-in on Google.
Slack vs Discord
- Slack: Built for work: channels, SSO, compliance, enterprise support, Salesforce/Agentforce.
- Discord: Built for communities and voice; strong for gaming, creators, and informal groups; different governance and billing model.
Summary table
| Dimension | Slack | Microsoft Teams | Google Chat |
|---|---|---|---|
| Typical rating | ~4.5 (G2, etc.) | ~4.4 | ~4.4 |
| Integrations | 2,600+ apps, very strong | Strong (Microsoft + third-party) | Strong within Workspace; fewer third-party |
| AI | Slackbot, Agentforce, AI search, summaries | Copilot and ecosystem | Duet AI / Workspace AI |
| Best fit | Mixed stack, tech teams, flexibility | Microsoft 365 shops | Google Workspace shops |
| Pricing | Free then ~$7.25+/user/mo | Often included with M365 | Often included with Workspace |
User experience and learning curve
Getting started
Sign-up is straightforward: you create a workspace, invite people by email, and optionally claim a domain. Onboarding guides you through creating channels and sending your first messages. Templates (e.g. for project management, marketing, support) help new workspaces get structure quickly. Free plan lets you try the product with minimal commitment.
Interface and daily use
Slack’s interface is channel-centric: sidebar with channels and DMs, main area for messages, and panels for threads, search, and apps. Customizable sidebar sections help users group channels and DMs. Search (including AI search) is prominent. Most people are productive within a few days; power users invest time in notifications, workflows, and keyboard shortcuts. Mobile and desktop apps are available and keep parity for core messaging and huddles.
Help and support
Help Center, Slack Community, and in-product tips cover most questions. Pro and above get 24/7 support; Business+ and Enterprise+ get priority support with faster first response (e.g. 4-hour target on Business+). Enterprise+ can include dedicated customer success. Overall, support is generally regarded as responsive and helpful; exact SLAs depend on plan.User feedback and ratings
Slack consistently receives high ratings on review sites (as of 2025–2026):
- G2: Around 4.5/5 with tens of thousands of reviews (e.g. 34,000+).
- Capterra: Around 4.7/5 with a large review count (e.g. 23,000+).
- TrustRadius: Around 9/10 with thousands of reviews.
- Software Reviews: Composite scores in the 9/10 range with high “likelihood to recommend” and “plan to renew” (e.g. 91% and 97% in cited data).
Ratings and review counts are from public sites and may change; check G2, Capterra, and TrustRadius for current data.
Who it's for
Best for
- Tech companies and startups that rely on many SaaS tools and want one place for chat, context, and automation.
- Product, engineering, and marketing teams that work in channels and need strong integrations (Jira, GitHub, Salesforce, etc.).
- Organizations that value AI in the flow of work – summaries, Slackbot, Agentforce, and enterprise search.
- Teams that collaborate with external partners and want Slack Connect instead of email for day-to-day communication.
- Mid-size to large companies that can justify per-seat pricing and want SSO, compliance, and enterprise support.
Less ideal for
- Strictly Microsoft 365 or Google Workspace–only organizations that prefer a single-vendor stack and don’t need Slack’s integration depth (Teams or Chat may be a better fit).
- Very small or cost-sensitive teams that don’t need long history or many apps (Free can work, but Pro adds cost).
- Teams that prefer email or meetings and don’t want to adopt channel-based communication; adoption may be low without culture change.
Real-world use
Anthropic
Anthropic (AI safety company) uses Slack to scale go-to-market and operations. Cited outcomes (from Slack’s customer story) include:- Cost savings: On the order of £3.4 million per year from using file sharing, Slack Connect, huddles, Clips, and task coordination in one place.
- Faster deals: 60% reduction in deal cycle time (e.g. about three days cut from complex deals).
- Scaling: Grew from a small GTM team to hundreds while staying aligned, with Slack as the main coordination layer.
- Salesforce in Slack: Use of Salesforce channels in Slack reportedly increased negotiation leverage by up to 20% in some cases.
Slack functions as the central hub for communication and context as Anthropic scales.
Rivian
Rivian (electric vehicle manufacturer) uses Slack across roughly 15,000 employees. Cited outcomes (from Slack’s customer story) include:- Adoption: About 85% of the company actively using Slack (e.g. 15,000+ monthly active users).
- Automation savings: Automation in Slack estimated to save on the order of $8.2 million per year.
- Onboarding: New employee ramp-up time improved by about 76% with structured Slack usage and workflows.
- Integrations: Hundreds of apps and 1,000+ workflows connecting plant workers, manufacturing systems, and ticketing; Slack Admin of the Year was awarded to a Rivian manager for building strong Slack practices.
Slack supports both day-to-day communication and operational workflows at scale.
These examples are from Slack’s own case studies; your results will depend on team size, discipline, and how you use channels, workflows, and integrations.
Future outlook and risks
Product direction
Slack is investing heavily in AI and agents: Slackbot, Agentforce, enterprise search, and tighter Salesforce integration. Expect more AI-powered summarization, search, and workflow features, and more agents that can take actions in Slack. The Agentic Platform and Slack Marketplace (agents and apps) will likely grow. Enterprise Search and Slack Atlas (profiles and org structure) support larger, more complex organizations.
Risks to consider
- Pricing changes – Salesforce has already adjusted plans (e.g. June 2025); further price or packaging changes could affect TCO.
- Integration and API changes – As the platform evolves, some APIs or app behaviors may change; custom integrations may need maintenance.
- Vendor lock-in – Deep reliance on Slack (and Salesforce) means product and policy decisions by one vendor affect your whole collaboration layer; some teams mitigate with clear channel and data policies and export options.
Staying informed via Slack’s blog, Help Center, and release notes helps you plan for new features and any changes.