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Software · head to head

Clockwise vs Slack

C

Clockwise

Software

Intelligent calendar management for teams

From
Free
Rated
-
Full reviewWebsite
Slack logo

Slack

Software

Where work happens

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Clockwise service discontinued and shut down on March 27, 2026; Slack 90-day message history limit on free plan results in important conversations disappearing
  • They diverge on capability: Clockwise covers Focus Time protection, Slack covers Channels.

Where they differ

Only the attributes on which Clockwise and Slack actually diverge.

Attributes where Clockwise and Slack differ
AttributeClockwiseSlack
Pricing modelfreemiumUnknown
PlatformsWebWeb, iOS, Android, macOS, Windows, Linux
Founded20162009

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Clockwise

  • Focus Time protection
  • Meeting optimization
  • Scheduling links
  • Team analytics
  • Conflict resolution
  • Google Calendar
  • Slack
  • Web support

Only in Slack

  • Channels
  • Direct messaging
  • Voice & video calls
  • Screen sharing
  • File sharing
  • Search
  • Workflow builder
  • Slack Connect

Both cover

  • Zoom
  • Asana

What people use each for

The jobs each tool is most often brought in to do.

Clockwise

  • Schedulingnot Slack
  • Appointment bookingnot Slack
  • Time trackingnot Slack
  • Resource managementnot Slack
  • Team coordinationnot Slack

Slack

  • Team communicationnot Clockwise
  • Project coordinationnot Clockwise
  • Customer supportnot Clockwise
  • Remote worknot Clockwise
  • Cross-functional collaborationnot Clockwise

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Clockwise

  • Service discontinued and shut down on March 27, 2026
  • All user data was deleted upon shutdown
  • Integration with Asana was removed during product lifecycle

Slack

  • 90-day message history limit on free plan results in important conversations disappearing
  • Per-user pricing becomes expensive quickly for larger teams
  • Notification overload with 78% of employees feeling overwhelmed by notifications
  • Mobile app performance issues including lag and slow syncing
  • Huddles limited to 50 people and cannot be recorded
  • Requires dedicated video conferencing service for formal meetings and webinars

Pricing, plan by plan

Clockwise

Free
  • FreeFree
    • Focus Time
    • Meeting optimization
    • Personal analytics
  • Teams$6.75/month
    • Team analytics
    • Flexible meetings
    • Admin controls

Slack

Free

No published plan breakdown. See the Slack review.

Which should you pick?

Choose Clockwise if

  • You need focus time protection.
  • You want to start without paying.
  • You also want meeting optimization.
Clockwise review

Choose Slack if

  • You need channels.
  • You want to start without paying.
  • You work on Web, iOS, Android, macOS, Windows, Linux.
  • You also want direct messaging.
Slack review

Questions people ask

Is Clockwise or Slack better?
Neither clearly leads. Clockwise starts at Free and Slack at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Clockwise or Slack?
Clockwise starts at Free and Slack at Free.
Does Clockwise or Slack run on more platforms?
Clockwise runs on Web. Slack runs on Web, iOS, Android, macOS, Windows, Linux.
Can I use Clockwise for free?
Both have a free tier, so you can try either at no cost before committing.
What is Clockwise best used for?
Clockwise is most often used for scheduling, appointment booking, time tracking, resource management. Of those, scheduling and appointment booking are not what Slack is typically brought in for.
What can Clockwise do that Slack cannot?
Clockwise covers Focus Time protection, Meeting optimization, Scheduling links, Team analytics. Slack covers Channels, Direct messaging, Voice & video calls, Screen sharing. Both handle Zoom, Asana.

Answered from the vendors’ own pages

Clockwise: What happened to Clockwise?

Clockwise was acquired by Salesforce and shut down on March 27, 2026. The company announced the team was joining Salesforce to work on Agentforce. User data was deleted and prorated refunds were issued to paying customers.

Source
Slack: Does Slack have a free plan?

Yes, Slack offers a free plan indefinitely with no credit card required. Free users get 90-day message history, up to 10 app integrations, and 1:1 huddles.

Source
Clockwise: What integrations did Clockwise support?

Clockwise integrated with Google Calendar, Microsoft Outlook, Slack, and previously Asana (though this integration was discontinued).

Source
Slack: What are Slack's pricing plans?

Slack offers Free, Pro ($7.25/user/month with annual billing), Business+ ($12.50/user/month), and Enterprise Grid (custom pricing). Monthly billing costs approximately 20% more than annual.

Source
Clockwise: What were Clockwise's key features?

Clockwise offered AI-powered focus time protection, automatic meeting buffers, Slack status sync, smart lunch breaks, and team calendar synchronization to optimize schedules and prevent burnout.

Source
Slack: Does Slack support offline use?

Slack is a cloud-based platform and does not support robust offline work. Internet connectivity is required to access messages and collaborate.

Source
Slack: What integrations does Slack support?

Slack integrates with 43+ apps on average per team, including Google Drive, ChatGPT, Vercel, Asana, GitHub, and many others through their app marketplace.

Source
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Related pages

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