Rock vs Slack

Rock

• Agencies and freelancers who bring clients into project spaces as guests
• Growing teams that want a flat bill instead of per-seat pricing
• Small teams replacing a separate chat app and task board

Slack

• Teams that want conversations organized by channel rather than email threads
• Companies that work with outside partners in shared channels
• Organizations that already run on Salesforce
• Teams that connect many third-party apps to their chat

Rock

• The Free plan stops at 3 group spaces, 5 members per space, and 50 tasks and 50 notes per space.
• Video and audio calls run through Zoom, Google Meet or Jitsi; Rock does not host calls itself.
• Sprints, recurring tasks, custom fields, time tracking, webhooks and Zapier are limited to the Unlimited plan.
• Rock does not offer refunds; a canceled plan stays active until the end of the billing period.

Slack

• The Free plan keeps only 90 days of message history searchable, allows 10 apps, and limits huddles and Slack Connect to 1:1.
• SAML single sign-on and SCIM start at Business+; ongoing Slackbot access is on Business+ and Enterprise+, with a limited trial on Free and Pro.
• Enterprise search, multiple SAML configurations and native data loss prevention are limited to Enterprise+, which is priced by sales.
• In a browser, huddles are supported only in Chrome and Firefox.

Rock

Spaces for each project or client

A space is a project room with its own chat, tasks, notes, files and meetings. 1:1 spaces are unlimited on both plans; the Free plan allows 3 group spaces.

Messaging

Real-time chat in every space with threads, reactions, mentions, voice messages and polls. Scheduled messages and the pinboard are part of the Unlimited plan.

Tasks in board, list and calendar views

Tasks take assignees, due dates, labels and checklists. Sprints, recurring tasks, custom fields and the time tracker need the Unlimited plan.

Notes and files

Write briefs and meeting notes inside a space, and keep uploads next to linked folders from Google Drive, Dropbox and OneDrive. Free spaces hold 250 MB of uploads each.

Meetings through Zoom, Meet and Jitsi

Start a Zoom, Google Meet or Jitsi call from the message bar and the join link is posted to the space. All three integrations are included on the Free plan.

Rock MCP and custom API

An MCP server lets assistants such as Claude, Codex and Cursor read spaces and create tasks, notes and messages on both plans. The custom API, webhooks and Zapier need Unlimited.

Slack

Channels and direct messages

Conversations are organized into channels for each project, topic or team, alongside direct messages. Paid plans keep the full message and file history searchable; Free keeps 90 days.

Huddles and clips

Huddles are audio and video meetings with screen sharing, 1:1 on Free and for groups on paid plans. Clips are recorded audio or screen updates shared in a conversation.

Slack Connect

Message people outside the company. Free allows 1:1 external direct messages; paid plans add group chats and shared channels with up to 250 organizations.

Canvases and lists

A canvas holds text, files, images and video inside Slack, and lists are used to manage projects and organize tasks with teammates.

Workflow Builder and apps

Workflow Builder automates routine processes without code, and the app directory lists more than 2,600 apps. A Free workspace can connect up to 10 of them.

AI in Slack

Pro includes AI conversation summaries. Business+ adds AI search, daily recaps, file summaries, workflow generation and the Slackbot personal agent, subject to plan limits.

Rock

• Free$0

  Unlimited 1:1 spaces and messages, 3 group spaces, 5 members per space, 50 tasks and 50 notes per space, and 250 MB of storage per space.

• Unlimited$74.92

  per month flat, billed yearly at $899 ($89 billed monthly)

  One price for any number of users: unlimited group spaces, tasks, notes and storage, 500 members per space, 50 workspaces, sprints, time tracker and Zapier.

Slack

• Free$0

  90 days of message history, up to 10 app integrations, and 1:1 huddles and external messages.

• Pro$7.25

  per user / month, billed annually ($8.75 billed monthly)

  Unlimited message history and app integrations, group huddles, Slack Connect channels with up to 250 organizations, and AI conversation summaries.

• Business+$15

  per user / month, billed annually ($18 billed monthly)

  Adds AI search, daily recaps, file summaries and workflow generation, the Slackbot agent, SAML single sign-on and SCIM user management.

• Enterprise+Custom

  Adds enterprise search across connected apps, multiple SAML configurations, EMM support, native data loss prevention and unlimited workspaces.

Rock

• Annual discount

  Save 16% with yearly billing

  Unlimited is $899 billed yearly instead of $89 a month, which the pricing page puts at a 16% saving, or $169 a year.

• Education

  Discounts for students and educators

  Rock's pricing FAQ says it offers discounts to students and educators on request. The amount and the requirements are not published.

• Nonprofit

  Discounts for nonprofits

  The same pricing FAQ extends the discount program to nonprofits, on request by contacting Rock. The amount is not published.

Slack

• Annual discount

  About 17% less with annual billing

  Pro is $7.25 per user / month paid annually against $8.75 paid monthly, and Business+ is $15 against $18. Salesforce's Slack pricing page puts the saving at approximately 16%.

• Other savings

  50% off the first 3 months for new teams

  A limited-time offer for teams that buy Pro or Business+ online within 7 days of creating the workspace. It applies to monthly billing only, and standard pricing follows after 3 months.

• Nonprofit

  Free or 85% off for eligible nonprofits

  Eligible nonprofits get a free Pro upgrade for workspaces with 250 or fewer members and 85% off above that size. Business+ is 85% off at any size.

• Education

  85% off for educational institutions

  The Slack for Education program gives approved institutions an 85% discount on the Pro or Business+ plan, applied at checkout.