Comparison

One Calendar vs GroupCal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

One Calendar

Consolidate all your calendars from various providers into a single, easy-to-read view. Manage appointments, events, and birthdays efficiently across all your devices. Offers a clean interface for seamless organization.

Highlights
  • Integrates multiple calendar providers
  • Unified calendar view
  • Manage appointments and events
  • Syncs across devices
  • Customizable colors and themes
  • Easy to use interface
Features
Read full description

The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays. OneCalendar is available on all platforms.

About

GroupCal

Easily create and share calendars for families, teams, or any community. Invite members via phone number or link and receive real-time updates on events. Integrates with existing calendars for a unified view.

Highlights
  • Create multiple shared calendars
  • Invite via phone number or link
  • Real-time event updates and notifications
  • Integrates with existing calendars
  • Public calendars for businesses and communities
  • Color-coded calendars and customization
  • Event attendance tracking
Features
Read full description

GroupCal is the most powerful platform for individuals and businesses, to share calendars with groups, families, customers, followers and any community. Inviting members to a shared calendar is quick and easy. Simply send a link to members, or invite them using their phone numbers from your contact list. They will be able to instantly view the calendar on any device. Members of shared calendars get real time updates when events are added or updated. GroupCal is free, easy to use, and available on any mobile device. ==== GroupCal - Main Features ==== SHARED CALENDARS FOR VARIOUS PURPOSES People use GroupCal to create shared calendars such as: • Family calendar for parents and children • Calendar for businesses with all activities and events • Calendar for teams to share meetings, projects and schedule • Calendar for students, teachers and classes • Calendar for a group of friends • Calendar for a group with a common interest • Public calendar for universities, clubs, bands and brands - anyone can search and join it CREATE MULTIPLE SHARED CALENDARS EASILY Create multiple shared calendars for different topics and groups. Each calendar is used for its own topic and with its own members. INVITE USING PHONE NUMBERS. NO NEED FOR EMAIL ADDRESS Invite members using their phone numbers, right from your contact list, or by sending a link via Email, Messenger, WhatsApp, or SMS. No need to have email addresses of the members. ALL YOUR CALENDARS IN ONE PLACE Your Existing Calendars are also in GroupCal. Your private schedule from Apple Calendar, Google Calendar, and Outlook is presented in GroupCal, side by side to the shared calendar you create or join using GroupCal. You get a unified view of all your calendars on one screen and in one place. BUSINESSES - CREATE PUBLIC CALENDARS Set calendars as “public” to have them visible to anyone around the world. Public calendars are searchable by GroupCal users. REAL TIME NOTIFICATIONS Members of shared calendars get real time updates and notifications when they are added to the calendar, and when events are added or updated. JOINING SHARED CALENDARS IS SO EASY Either click on a link a member sent to you, or join an existing public calendar on GroupCal by using the search option: discover your University's schedule, Yoga class schedule, your favorite band’s concerts and more. COLOR CODED CALENDARS AND SPECIAL CUSTOMIZATION Select a color and a photo for each calendar to easily distinguish between calendars and their events. KNOW HOW’S ATTENDING Get a better visibility about each event: see when the event was delivered per member, and who accepted or declined participation. MINIMALIST DESIGN & USER FRIENDLY GroupCal has a simple and clear design that makes it super easy to use. It’s built to be very user friendly and intuitive. Features in the app are accompanied with short explanations so you don’t have to spend much time to learn and get used to it. ADD REMINDERS AND TASKS TO CALENDAR EVENTS Use advanced features such as recurrence to events, multiple reminders for each event, or notes and subtasks which are assigned to events. ADVANCED CALENDAR PERMISSIONS Choose the permission level for each shared calendar. Assign admins, set whether the calendar’s name and photo can be changed, who is allowed to add or update events, and whether members can add other new members to the calendar. CROSS PLATFORM GroupCal is available worldwide for all major platforms.

Screenshots

One Calendar4 screens
GroupCal4 screens

Verdict

The call

The clearest difference is ratings volume: One Calendar at 21K against GroupCal's 884. On price, rating, review sentiment and update cadence there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. One Calendar sells 1 one-off in-app purchase and GroupCal sells 9 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for One Calendar against 4.7 for GroupCal. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 884, so its average is the more settled of the two. Written reviews are what separate them: 81% of One Calendar's written reviews are positive against 79% of GroupCal's.

UpkeepUpdate frequency

One Calendar ships an update every 3 weeks, GroupCal every 2 weeks. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

Scorecard1 real difference · 9 level
One Calendar versus GroupCal: the parameters behind the verdict, then further details
ParameterOne CalendarGroupCal
PriceFreeFree
Rating4.8 (21K ratings) — better4.7 (884 ratings)
Positive reviews80.6% of reviews — better79.1% of reviews
Number of ratings21K — better884
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Apple Watch
Requires iOS15.0 — better16.0
Further details — not scored
Size91 MB74 MB
Age rating12+4+
DeveloperCode Spark24me

Customer experience

One Calendar

All ratings20,728 ratings
Positive95.4%
Neutral3.2%
Negative1.4%
Written reviews832 reviews
Positive80.6%
Neutral8.5%
Negative10.8%

GroupCal

All ratings875 ratings
Positive92.7%
Neutral3.4%
Negative3.9%
Written reviews537 reviews
Positive79.1%
Neutral5.8%
Negative15.1%

User reviews

One Calendar

From 21K App Store ratings

What we love

  • 🚀 Easy to use
  • 👍 Clean and simple interface
  • 👍 Integrates multiple calendars
  • 🚀 Syncs across devices
  • 👍 Customizable colors and themes

Room to improve

  • 🐛 Syncing issues
  • 🐛 Bugs and glitches
  • 🔒 Lacks security features
  • 🔋 Drains battery
  • 👎 Restrictive features in free version

GroupCal

From 884 App Store ratings

What we love

  • 👍 User-friendly interface
  • 🚀 Efficient scheduling and coordination
  • 💡 Helpful for families and small businesses
  • 🙌 Great for shared calendars and event planning

Room to improve

  • 🐛 Occasional bugs and glitches
  • 🔒 Concerns about privacy and data access
  • 💸 Limited features in free version

Bugs and requests

One Calendar

Reported bugs

5 issues
  • Sync errors
  • Unresponsive buttons
  • Incorrect time zone display
  • Duplicate events
  • Inability to delete future occurrences of recurring events

Requested features

6 requests
  • Multiple reminders for events
  • Ability to edit recurring events
  • Option to change event calendar after creation
  • Printing support
  • More customization options
Show 1 more
  • Widgets for better visibility

GroupCal

Reported bugs

3 issues
  • Inability to delete shared calendars
  • Calendar events not syncing properly
  • Phone number verification issues

Requested features

3 requests
  • Color-coding for individual calendars
  • Improved recurring event scheduling
  • Integration with other calendar apps

In-app purchases

1 purchases

One Calendar

One-time1
  • OneCalendar premium$5.99
9 purchases

GroupCal

Subscriptions9
  • Pro7 Days trial$14.991 Month
  • Pro$14.991 Month
  • Business7 Days trial$74.991 Month
Show 6 more
  • GroupCal Pro1 Year trial2 variants$119.991 Year
  • GroupCal Pro7 Days trial$119.991 Year
  • Business +7 Days trial$224.991 Month
  • GroupCal Business1 Year trial$599.991 Year
  • Business7 Days trial$599.991 Year
  • Business +7 Days trial$1000.001 Year

Questions

Is One Calendar free?
One Calendar is free to download, with in-app purchases available.
Is GroupCal free?
GroupCal is free to download, with in-app purchases available.
Which has better reviews, One Calendar or GroupCal?
One Calendar is rated higher. One Calendar averages 4.8 out of 5 from 21K ratings, while GroupCal averages 4.7 from 884 ratings.
Do One Calendar or GroupCal have ads?
Neither One Calendar nor GroupCal shows ads.
Which is updated more often, One Calendar or GroupCal?
One Calendar ships an update every 3 weeks, and GroupCal every 2 weeks. Most recently, One Calendar was updated on November 4, 2026 and GroupCal on November 3, 2026.

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