Slack
7.1/10Slack is a channel-based messaging platform from Salesforce, with Lists, canvases, huddles and Workflow Builder for team coordination and light task tracking.
Data last updated November 2026 · Our methodology
Overview
Slack is Salesforce's workplace messaging platform. Teams talk in channels, threads, direct messages and huddles, and Slack Connect extends those conversations to outside organizations. For project work, Slack Lists turns tasks into tables or boards with assignees, due dates, subtasks and saved views. Canvases hold documents and checklists, and Workflow Builder automates routine requests and approvals. That makes Slack a reasonable coordination layer for small and mid-sized teams. Larger organizations get unlimited workspaces, enterprise search and granular roles on Enterprise+. Pricing is per user. The Free plan keeps 90 days of message history and allows up to 10 apps. Pro costs EUR 8.25 per user per month on monthly billing, or EUR 6.75 per user per month billed annually. Business+ costs EUR 18 monthly or EUR 15 annually per user, and Enterprise+ is quoted by sales. Advanced AI features such as search, recaps and AI-generated workflows come with Business+ and above. Enterprise Key Management, frontline worker plans and premium support plans are sold as extras. Slack's main strength is its integration ecosystem: thousands of apps, including ClickUp, Notion, HubSpot, Harvest and Clockify, can post into channels and trigger workflows. The main limitation for project management buyers is that Slack is not a full PM suite. It has no native Gantt charts, dependencies, time tracking or portfolio reporting, so most teams pair it with a dedicated project tool. Reviewers also often complain about notification overload and workspaces that get noisy as they grow.
Our Rating
Who Slack is best for
Good fit
Enterprise+ offers unlimited workspaces, enterprise key management and wide compliance coverage, including FedRAMP.
Business+ adds data exports, channel posting permissions and AI features for growing teams.
Pro adds unlimited history and apps at a modest per-user price.
The free tier and low Pro price, plus channels and integrations, cover early coordination needs.
Slack Connect lets agencies work with up to 250 external organizations in shared channels.
Shared channels and canvases suit per-client communication and documentation.
Pros & Cons
Pros
- The app ecosystem is very large, and tools such as ClickUp, Notion, HubSpot and Clockify can post updates into channels.
- Slack Connect lets teams work in shared channels with up to 250 outside organizations on paid plans.
- Compliance coverage is broad, including ISO 27001, SOC 2 Type II, FedRAMP Moderate and HIPAA configurability.
- Lists add table and board layouts with assignees, due dates and subtasks, without leaving chat.
- Workflow Builder automates routine requests and approvals without code.
Cons
- There are no native Gantt charts, dependencies, time tracking or portfolio reporting, so Slack doesn't replace a dedicated PM tool.
- Frequent notifications and busy channels can interrupt focus, a common complaint in reviews.
- The free plan keeps only 90 days of message history and allows 10 apps.
- Advanced AI features require Business+ or above, and per-user costs add up as teams grow.
- Reviewers report that finding older messages through search can be difficult.
Key Features
Slack Pricing
Free
- Basic AI
- 1:1 huddles
- One workspace
- Up to 10 apps
- 90-day message history
- Data deleted after 1 year
- 1:1 Slack Connect messaging
Pro
or €81/user/year (save 18%)
- Basic AI
- Group huddles
- One workspace
- Unlimited apps
- Unlimited message history
- Lists of up to 1,000 items
- Slack Connect with up to 250 organizations
Business+
or €180/user/year (save 17%)
- Data exports
- Everything in Pro
- AI workflow generation
- Slackbot (subject to plan limits)
- Posting permissions in any channel
- Advanced AI, including AI search, daily recaps and file summaries
Enterprise+
- Granular roles
- Custom templates
- Enterprise search
- Unlimited workspaces
- Everything in Business+
- Flagged-content management
- Multiple SAML configurations
Frequently Asked Questions
Yes. The Free plan has no time limit, but it keeps 90 days of message history, allows up to 10 apps and limits huddles to 1:1.
Pro is EUR 8.25 per user per month on monthly billing or EUR 6.75 billed annually. Business+ is EUR 18 monthly or EUR 15 annually. Enterprise+ is quoted by sales. New teams can get 50% off monthly billing for 3 months if they buy within 7 days of creating the team.
Yes, in a lightweight way. Slack Lists support table and board layouts, assignees, due dates, subtasks and saved views, with up to 1,000 items on Pro and Business+. There are no Gantt charts or native time tracking.
Slack holds ISO 27001, 27017, 27018, 27701 and 42001 certifications, plus SOC 2 Type II and SOC 3. It also has FedRAMP Moderate authorization with an add-on, and it can be configured for HIPAA and FINRA requirements.
Yes. Slack Connect supports 1:1 external messages on Free and group channels with up to 250 organizations on paid plans.
Salesforce. It completed the acquisition in July 2021.
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