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Project Management · head to head

GanttPRO vs Outlook Calendar

GanttPRO logo

GanttPRO

Project Management

Online Gantt chart software

From
$7/month
Rated
-
Full reviewWebsite
Outlook Calendar logo

Outlook Calendar

Calendars

Professional calendar management for Microsoft 365

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Outlook Calendar has a free tier, so it costs nothing to try first.
  • Each has a real cost: GanttPRO workload management, portfolios, reports and budget planning all require the Business plan at $17 per user per month; Outlook Calendar offline support limited to only past 30 days of events, older events unavailable
  • They diverge on capability: GanttPRO covers Gantt charts, Outlook Calendar covers Meeting scheduling.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which GanttPRO and Outlook Calendar actually diverge.

Attributes where GanttPRO and Outlook Calendar differ
AttributeGanttPROOutlook Calendar
Starting price$7/monthFree
Pricing modelsubscriptionUnknown
Free tierNoYes
PlatformsWebWeb, Windows, macOS, iOS, Android
CategoryProject ManagementCalendars
Founded20151975

Identical on both: 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 GanttPRO

  • Gantt charts
  • Resource management
  • Time tracking
  • Dependencies
  • Export
  • Jira
  • Google Drive
  • SSL encryption

Only in Outlook Calendar

  • Meeting scheduling
  • Shared calendars
  • Room booking
  • Availability sharing
  • Recurring events
  • Microsoft Teams
  • OneDrive
  • SharePoint

Both cover

  • Slack
  • Web support

What people use each for

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

GanttPRO

  • Building Gantt chart schedules with auto scheduling and dependenciesnot Outlook Calendar
  • Planning resources and budgets against a project timelinenot Outlook Calendar

Outlook Calendar

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

Where each one falls short

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

GanttPRO

  • Workload management, portfolios, reports and budget planning all require the Business plan at $17 per user per month
  • SAML SSO, custom roles and API access are Enterprise only at $25 per user per month
  • The Enterprise plan carries a 5 user minimum and requires an annual subscription
  • Custom fields and calendar view are excluded from the entry Core plan
  • Every published rate assumes annual billing, which the vendor prices 20% below monthly

Outlook Calendar

  • Offline support limited to only past 30 days of events, older events unavailable
  • Shared calendars and group calendars not available offline
  • Cached Exchange Mode issues can limit available offline data
  • Occasional sync conflicts when coming back online

Pricing, plan by plan

GanttPRO

$7/month
  • Core$7/month
    • Annual billing (20% discount vs monthly)
    • Gantt charts, project calendar, auto scheduling
    • Unlimited virtual resources
  • Advanced$10/month
    • Annual billing
    • Overdue tasks, custom fields and filters
    • Calendar exceptions, custom project templates
  • Business$17/month
    • Annual billing
    • Workload management, portfolios and reports
    • Budget planning, time tracking
  • Enterprise$25/month
    • Annual billing (normally $35, 20% discount applied)
    • Minimum 5 users required
    • SAML SSO, custom roles and rights

Outlook Calendar

Free
  • FreeFree
    • Outlook.com email and calendar
    • 50MB attachment limit
    • 1GB cloud storage
  • Microsoft 365 Basic$19.99/year
    • Outlook with limited features
    • Cloud storage
  • Microsoft 365 Personal$99.99/year
    • Premium Outlook
    • Ad-free email
    • 100GB mailbox storage
  • Microsoft 365 Business Basic$6/month
    • Business-class email
    • 1TB cloud storage
    • Microsoft Teams

Which should you pick?

Choose GanttPRO if

  • You need gantt charts.
  • You also want resource management.
GanttPRO review

Choose Outlook Calendar if

  • You need meeting scheduling.
  • You want to start without paying.
  • You work on Web, Windows, macOS, iOS, Android.
  • You also want shared calendars.
Outlook Calendar review

Questions people ask

Is GanttPRO or Outlook Calendar better?
Neither clearly leads. GanttPRO starts at $7/month and Outlook Calendar at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GanttPRO or Outlook Calendar?
Outlook Calendar has a free tier; the other does not. Paid plans start at $7/month for GanttPRO and Free for Outlook Calendar.
Does GanttPRO or Outlook Calendar run on more platforms?
GanttPRO runs on Web. Outlook Calendar runs on Web, Windows, macOS, iOS, Android.
Can I use Outlook Calendar for free?
Yes. Outlook Calendar has a free tier, so you can try it without paying. GanttPRO starts at $7/month.
What is GanttPRO best used for?
GanttPRO is most often used for building gantt chart schedules with auto scheduling and dependencies, planning resources and budgets against a project timeline. Of those, building gantt chart schedules with auto scheduling and dependencies and planning resources and budgets against a project timeline are not what Outlook Calendar is typically brought in for.
What can GanttPRO do that Outlook Calendar cannot?
GanttPRO covers Gantt charts, Resource management, Time tracking, Dependencies. Outlook Calendar covers Meeting scheduling, Shared calendars, Room booking, Availability sharing. Both handle Slack, Web support.

Answered from the vendors’ own pages

GanttPRO: What is GanttPRO's cheapest plan?

The Core plan starts at $7 per user per month with annual billing (20% discount vs monthly). It includes Gantt charts, project calendar, auto scheduling, and unlimited virtual resources.

Source
Outlook Calendar: Is Outlook Calendar free?

Outlook.com with calendar is free via a Microsoft account. Outlook Calendar also comes with Microsoft 365 Personal ($99.99/year), Family ($129.99/year), or Business plans starting at $6/user/month.

Source
GanttPRO: Does GanttPRO offer a free trial?

Yes, GanttPRO offers a 14-day free trial with full featured access and no credit card required. Large teams (20+ members) qualify for additional discounts, and nonprofits, students, and educators receive a 50% discount.

Source
Outlook Calendar: Does Outlook Calendar work offline?

Outlook Calendar has limited offline support. New Outlook caches only the past 30 days of calendar items. Shared calendars and group calendars are not supported offline. Changes sync when you reconnect.

Source
GanttPRO: What is included in GanttPRO's Enterprise plan?

The Enterprise plan ($25/user/month annual billing; minimum 5 users) includes SAML SSO, custom roles and rights, product training, resource conversion, unlimited storage, and all features from lower tiers. Monthly billing for Enterprise costs $35/user/month (regularly, before discount).

Source
Outlook Calendar: What platforms does Outlook Calendar support?

Outlook Calendar is available on Windows (desktop and web), macOS (desktop and web), iOS, and Android. Real-time synchronization works across all devices.

Source
Outlook Calendar: Does Outlook Calendar integrate with Slack?

Yes. Outlook Calendar integrates with Slack to sync your status and receive meeting notifications. You can RSVP to invites directly in Slack and join Microsoft Teams meetings from Slack reminders.

Source
Outlook Calendar: Can you share calendars and set delegate permissions?

Yes. Outlook Calendar supports calendar sharing with delegate permissions, color categories for organization, and the Scheduling Assistant to view attendee availability for meeting times.

Source
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