All industries · head to head
Slack vs Calendly
Calendly
All industries
Scheduling automation platform for eliminating back-and-forth
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Slack 90-day message history limit on free plan results in important conversations disappearing; Calendly the free plan allows one event type and one calendar connection, so it cannot handle different meeting formats
- They diverge on capability: Slack covers Channels, Calendly covers Calendar sync.
Where they differ
Only the attributes on which Slack and Calendly actually diverge.
Identical on both: starting price (Free), pricing model (Unknown), free tier (Yes), user rating (Not yet rated).
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 Slack
- Channels
- Direct messaging
- Voice & video calls
- Screen sharing
- File sharing
- Search
- Workflow builder
- Slack Connect
Only in Calendly
- Calendar sync
- Automated scheduling
- Custom availability
- Time zone detection
- Reminder emails
- Buffer time
- Meeting polls
- Embed on website
Both cover
- Office 365
- Salesforce
- Zoom
- SOC2
- HIPAA
What people use each for
The jobs each tool is most often brought in to do.
Slack
- Team communicationnot Calendly
- Project coordinationnot Calendly
- Customer supportnot Calendly
- Remote worknot Calendly
- Cross-functional collaborationnot Calendly
Calendly
- Sales meetingsnot Slack
- Interview schedulingnot Slack
- Customer callsnot Slack
- Office hoursnot Slack
- Webinar registrationnot Slack
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
Calendly
- The free plan allows one event type and one calendar connection, so it cannot handle different meeting formats
- Automated reminders and multiple calendars need Standard at $10 per seat per month
- Round-robin routing, lead qualification and Salesforce integration require Teams at $16 per seat per month
- SAML single sign-on, audit logs and domain control are Enterprise only, starting at $15,000 a year
- Advertised prices are the annual rates
Pricing, plan by plan
Slack
FreeNo published plan breakdown. See the Slack review.
Calendly
Free- FreeFree
- 1 event type
- 1 calendar connection
- Basic confirmation email
- Standard$10/month
- Unlimited event types
- Multiple calendars (up to 6)
- Integrations with HubSpot, Mailchimp, Stripe, PayPal
- Teams$16/month
- All Standard features
- Salesforce integration
- Round-robin meetings
- Enterprise$15000/year
- All Teams features
- Salesforce routing lookup
- Microsoft Dynamics 365
Which should you pick?
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.
Choose Calendly if
- You need calendar sync.
- You want to start without paying.
- You work on Web, iOS, Android.
- You also want automated scheduling.
Questions people ask
- Is Slack or Calendly better?
- Neither clearly leads. Slack starts at Free and Calendly at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Slack or Calendly?
- Slack starts at Free and Calendly at Free.
- Does Slack or Calendly run on more platforms?
- Slack runs on Web, iOS, Android, macOS, Windows, Linux. Calendly runs on Web, iOS, Android.
- Can I use Slack for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Slack best used for?
- Slack is most often used for team communication, project coordination, customer support, remote work. Of those, team communication and project coordination are not what Calendly is typically brought in for.
- What can Slack do that Calendly cannot?
- Slack covers Channels, Direct messaging, Voice & video calls, Screen sharing. Calendly covers Calendar sync, Automated scheduling, Custom availability, Time zone detection. Both handle Office 365, Salesforce, Zoom, SOC2.
Answered from the vendors’ own pages
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.
SourceCalendly: Does the free tier include automatic reminders?
No. The free plan only includes a basic confirmation email when someone books. Automated reminder workflows, SMS reminders, and follow-up sequences require the Standard plan ($10/month or higher).
SourceSlack: 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.
SourceCalendly: Can I offer multiple meeting types on the free plan?
Only one event type can be active at a time. You can create multiple event types, but only one booking link works simultaneously. Switching between different meeting lengths requires manually activating another event type.
SourceSlack: 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.
SourceCalendly: Does Calendly work with Apple Calendar and iCloud?
No longer for new users. As of August 20, 2024, new users cannot connect iCloud or Apple Calendar. Existing connections continue to work, but Calendly ended support for new Apple Calendar integrations citing Apple's security changes.
SourceSlack: 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.
SourceCalendly: What platforms can I use Calendly on?
Calendly is available on Web, iOS, and Android. Browser extensions are available for Safari. There are no dedicated Windows or Mac desktop applications.
SourceCalendly: What does the Standard plan ($10/month) add over free?
Unlimited event types, multiple calendar connections (up to 6), integrations with HubSpot, Mailchimp, Salesforce, Stripe, PayPal, Zapier, and webhooks, plus automated reminders and email sequences.
Source