Slack

Overview

Slack is a channel-based messaging and collaboration service for teams that want work conversations alongside connected tools. It is strongest when a team needs integrations, automated workflows, or structured collaboration with outside organizations; its free tier is workable for small-scale use but short message retention and a ten-app ceiling make it a limited long-term archive.

Key features

Channels and external collaboration

Channels give teams a shared place for conversations, and guest access supports work with people outside the organization. On the Free plan, Slack Connect supports one-to-one external messages. Paid plans widen that collaboration to direct messages, group chats, or dedicated channels spanning up to 250 organizations, a meaningful upgrade for teams working across company boundaries.

Apps and workflows

Slack connects with services including Salesforce, Jira, Google Drive, ChatGPT, Asana, Miro, Notion, Zoom, GitHub, GitLab, PagerDuty, Box, Dropbox, Zendesk, Freshdesk, and HubSpot. Its Marketplace and App Directory offer over 2,600 apps. That breadth can keep work tools close to team conversations, but Free users can connect only ten apps; paid plans remove that cap with unlimited app integrations.

Workflow Builder automates routine tasks and processes inside Slack without coding. Built-in AI includes summaries, AI search, daily recaps, file summaries, workflow generation, and Slackbot. These features make Slack more than a messaging layer for teams that want routine work and information retrieval to happen in the same place.

Calls, history, and security

Free users can hold one-to-one audio and video meetings with screen sharing. Free workspaces retain and search messages for 90 days, then delete data after one year. That is a consequential limit for teams that rely on old discussions as reference; paid plans provide unlimited message history and keep data for life by default, with adjustable retention settings.

Slack encrypts data at rest and in transit by default. Security controls include two-factor authentication, access logs, SSO, device management, and data loss prevention. It supports 12 SSO options, including Okta, Google, and Azure, and provides native device management for mobile and desktop. Those controls suit organizations with stronger administration needs, though the plan descriptions position expanded administration and compliance features at Enterprise+.

Pricing

Slack is freemium. The Free plan costs ₹0 and is free forever; it includes 90 days of searchable history, up to ten apps, one-to-one meetings, and one-to-one external messaging. Its limits are manageable for teams with modest integration needs and little need to consult older messages, but they make Free a poor fit as a lasting knowledge archive.

Pro costs $8.75 a month when billed monthly, or $7.25/user/mo on the annual pricing note. It adds unlimited message history and app integrations, plus group external messaging with up to 250 organizations. Pro is the practical step up for teams that outgrow Free's history or app caps.

Business+ costs $18 a month when billed monthly. It includes unlimited history and integrations, group external messaging with up to 250 organizations, and is described as the plan for AI-powered work and advanced AI features. It is aimed at teams seeking those capabilities beyond Pro, though the monthly plan details do not distinguish additional feature quotas.

Enterprise+ has custom pricing through sales and includes unlimited history and integrations, group external messaging with up to 250 organizations, enterprise-grade AI, and expanded administration and compliance features. It is the fit for organizations that need those enterprise controls rather than a published self-serve price.

Platforms

Slack supports web, Windows, macOS, Linux, iOS, Android, and API access, making it available across desktop, mobile, browser, and software integrations.

Who it's for

Slack suits teams that organize work in channels, depend on a broad range of connected apps, or collaborate with external partners. Paid plans make the most sense when history must remain searchable, app use exceeds ten integrations, or group external messaging is necessary. Teams that need only lightweight chat and can live with 90-day searchable history may stay on Free; those needing a durable archive should budget for paid service.

Pros and cons

• Pro: More than 2,600 apps and unlimited integrations on paid plans let teams bring many services into their communication workflow.
• Pro: Workflow Builder automates routine processes without coding, while AI features cover summaries, search, recaps, files, and workflow generation.
• Pro: Paid external collaboration supports DMs, group chats, or dedicated channels with up to 250 organizations.
• Con: Free searchable history stops at 90 days and data is deleted after one year, limiting its usefulness as a long-term record.
• Con: Free's ten-app ceiling can force an upgrade for teams whose workflow depends on more connected tools.
• Con: Business+ is substantially more expensive than Pro at monthly billing, while its listed plan inclusions do not specify extra quotas.

Alternatives

For an employee directory rather than a team messaging hub, compare Employee Directory Software. For broader category comparisons, browse Team chat apps or Team Collaboration Software.

Business in a Box is another freemium option available on desktop, mobile, and web. Connecteam is a freemium option with a free trial and Android, iOS, API, and web support. Names & Faces offers a freemium option across desktop, mobile, and web. Workleap Pingboard is a freemium directory option with annual Standard and Pro plans. MangoApps is a paid option with a free trial and desktop, mobile, web, and self-hosted support. GoProfiles is a freemium option for web and iOS. HourSquare offers a free plan for teams of up to 10 employees. Openbook is a freemium web-based daily stand-up option.

Verdict

Choose Slack if your team needs channels, extensive integrations, workflow automation, or structured external collaboration in one communication service. Its breadth is the main reason to pay; the main reason to look elsewhere is that Free is not a durable message archive, while preserving history and removing app limits requires a subscription.