#4 in Collaboration & CommunicationUpdated 2026-08

Slack

by Slack · Channel-based team messaging with built-in AI and workflow automation

76.5 — BenchRank score out of 100

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Overview

Slack is a messaging platform built around channels, where teams, apps and AI agents share conversations, files and decisions. It includes huddles for audio and video, Slack Connect for messaging people at other organisations, and Workflow Builder for automating routine tasks. Slackbot, its AI agent, summarises conversations and answers searches across the workspace.

Best for: Teams wanting channel-based messaging, huddles and AI summaries in one place, plus external chat.
Pricing: Free plan at £0, then Pro at £7 and Business+ at £14.40 per user/month billed monthly, with Enterprise+ priced on request.
Runs on: WebAndroidmacOSCLI

Strengths and trade-offs

Strengths

Channels, huddles and Slack Connect for external teams
Unlimited message history and app integrations on paid plans
AI summaries, daily recaps and AI search included on paid tiers
Workflow Builder automations by click or by code

Trade-offs

Free plan caps history at 90 days and integrations at ten apps
SAML single sign-on needs Business+; Pro only offers Google OAuth
Enterprise search and multiple workspaces are Enterprise+ only
Priced per user per month, so cost rises with headcount

Pricing

Published plans from Slack’s own pricing page, in GBP. Usage charges and add-ons may apply on top.

Slack pricing tiers, monthly rates in GBP
Plan	Monthly	Includes
Free	—per user	90 days of message history Up to ten apps 1:1 meetings and 1:1 external messages Basic AI, including conversation summaries and AI search
Pro	£7per user	Unlimited message history and app integrations Group meetings and group external messages Basic AI; single sign-on via Google OAuth 24/7 customer support
Business+	£14.4per user	Advanced AI, including Slackbot personal agent SAML-based single sign-on and SCIM user management Native data loss prevention and admin analytics 24/7 support with four-hour first response
Enterprise+	Contact sales	Enterprise-grade AI and enterprise search Unlimited workspaces and multiple SAML configurations Enterprise Key Management available as an add-on 24/7 priority support with four-hour first response

How this score is made up

Each dimension is scored out of 100 and combined into the headline score using fixed weights.

MCP support: 92 out of 100
API quality: 55 out of 100
Documentation: 90 out of 100
Agent friendliness: 80 out of 100
Pricing transparency: 100 out of 100
Customer sentiment: 81 out of 100
Changelog: 40 out of 100
Marketing site structure: 55 out of 100
Operational trust: 85 out of 100

Measured, but not part of the score

Useful to know, but not a mark for or against the product — so these do not affect the ranking.

Openness: 0 out of 100

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