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Calendars · head to head

Outlook Calendar vs Resource Guru

Outlook Calendar logo

Outlook Calendar

Calendars

Professional calendar management for Microsoft 365

From
Free
Rated
-
Full reviewWebsite
Resource Guru logo

Resource Guru

Calendars

The fast, simple way to schedule people and resources

From
$5/month
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: Outlook Calendar offline support limited to only past 30 days of events, older events unavailable; Resource Guru limited advanced reporting and analytics compared to enterprise-level solutions
  • They diverge on capability: Outlook Calendar covers Meeting scheduling, Resource Guru covers Resource scheduling.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Outlook Calendar and Resource Guru actually diverge.

Attributes where Outlook Calendar and Resource Guru differ
AttributeOutlook CalendarResource Guru
Starting priceFree$5/month
Free tierYesNo
PlatformsWeb, Windows, macOS, iOS, AndroidWeb
Founded19752012

Identical on both: pricing model (Unknown), user rating (Not yet rated), category (Calendars).

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 Outlook Calendar

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

Only in Resource Guru

  • Resource scheduling
  • Availability management
  • Clash management
  • Forecasting
  • Leave management
  • Google Calendar
  • Outlook
  • Zapier

Both cover

  • Slack
  • Web support
  • Ios support
  • Android support

What people use each for

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

Outlook Calendar

  • Scheduling
  • Appointment booking
  • Time tracking
  • Resource management
  • Team coordination

Resource Guru

  • Scheduling
  • Appointment booking
  • Time tracking
  • Resource management
  • Team coordination

Both are used for scheduling, appointment booking, time tracking, resource management, team coordination, on those jobs the choice comes down to price and fit rather than capability.

Where each one falls short

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

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

Resource Guru

  • Limited advanced reporting and analytics compared to enterprise-level solutions
  • Lacks scalability for large organizations or complex project management scenarios
  • No offline mode requires constant internet connectivity
  • Limited integrations compared to competitors with broader ecosystem support
  • No native invoicing or billing features for financial management

Pricing, plan by plan

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

Resource Guru

$5/month
  • Grasshopper$5/month
    • Unlimited projects
    • Unlimited clients
    • Personalized dashboards
  • Blackbelt$8/month
    • All Grasshopper features
    • Timesheets
    • Time tracking
  • Master$12/month
    • All Blackbelt features
    • Booking approval workflow
    • SSO single sign-on

Which should you pick?

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

Choose Resource Guru if

  • You need resource scheduling.
  • You also want availability management.
Resource Guru review

Questions people ask

Is Outlook Calendar or Resource Guru better?
Neither clearly leads. Outlook Calendar starts at Free and Resource Guru at $5/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Outlook Calendar or Resource Guru?
Outlook Calendar has a free tier; the other does not. Paid plans start at Free for Outlook Calendar and $5/month for Resource Guru.
Does Outlook Calendar or Resource Guru run on more platforms?
Outlook Calendar runs on Web, Windows, macOS, iOS, Android. Resource Guru runs on Web.
Can I use Outlook Calendar for free?
Yes. Outlook Calendar has a free tier, so you can try it without paying. Resource Guru starts at $5/month.
What is Outlook Calendar best used for?
Outlook Calendar is most often used for scheduling, appointment booking, time tracking, resource management.
What can Outlook Calendar do that Resource Guru cannot?
Outlook Calendar covers Meeting scheduling, Shared calendars, Room booking, Availability sharing. Resource Guru covers Resource scheduling, Availability management, Clash management, Forecasting. Both handle Slack, Web support, Ios support, Android support.

Answered from the vendors’ own pages

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
Resource Guru: How is Resource Guru priced?

Resource Guru offers three per-user tiers: Grasshopper ($5/month), Blackbelt ($8/month), and Master ($12/month). Annual billing gives 2 months free. Non-human resources like meeting rooms cost $2.08-5.00 per item depending on tier. A free 30-day trial is available.

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
Resource Guru: What integrations does Resource Guru offer?

Resource Guru integrates with Jira, Asana, Slack, Microsoft Teams, Google Calendar, Outlook Calendar, Zapier, Make, Salesforce, and Gmail for seamless workflow automation.

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
Resource Guru: Does Resource Guru have time tracking?

Time tracking is included in Blackbelt and Master plans, allowing teams to monitor billable and non-billable hours. The Grasshopper plan does not include this feature.

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.

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Resource Guru: Can Resource Guru be used offline?

No, Resource Guru is a cloud-based platform that requires internet connectivity to access. There is no offline mode available.

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
Resource Guru: Is Resource Guru suitable for large enterprises?

Resource Guru works well for small to mid-sized teams and agencies but may face scalability limitations for large enterprises requiring advanced reporting, project financial visibility, or complex multi-team workflows.

Source
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