Comparison

Occasions 3 vs One Calendar

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

Head to head
About

Occasions 3

Never forget important dates like birthdays, anniversaries, and holidays again. This app helps you track special events, set multiple custom alerts, and even send well wishes directly from your device. It offers seamless integration with your contacts and calendar, with options for customization and convenient access via widgets and Apple Watch.

Highlights
  • Sync events with Contacts
  • Multiple custom alerts per event
  • Categorized holiday selection
  • Add events to device calendar
  • Send messages directly from app
  • Customizable themes and icons
  • Widgets and Apple Watch app
  • Automatic iCloud backup
Features
Read full description

Remembering birthdays, anniversaries, holidays and other special events is now easier than ever. Occasions is the best way to keep track of and remember important events in your busy life. You can also send your well wishes to friends and family, right from the app. Here’s what you can do with Occasions as your special-events manager: • Sync birthdays, anniversaries and other events with Contacts. • Set up to 3 alerts for each event, and customize alerts for individual events. • Choose from a wide selection of holidays, conveniently categorized by country and religion. • Add events from Occasions to your device’s built-in calendar. • Create events that are independent of Contacts. • Send messages to friends and loved ones via phone, email or text, right from the app. • Change the app's look and feel with themes and app icons. • Glance at the widgets and Apple Watch app to see timely event information. • Automatically back up your data to iCloud.

About

One Calendar

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

Highlights
  • Integrates multiple calendar providers
  • Easy-to-read overview
  • Manage appointments and events
  • View birthdays
  • Cross-platform availability
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.

Screenshots

Occasions 34 screens
One Calendar4 screens

Verdict

The call

The clearest difference is price: One Calendar at Free against Occasions 3's $2.99. One Calendar also leads on update cadence (fortnightly vs every 3 months) and ratings volume (21K vs 2.4K). Occasions 3's advantage is in-app purchases (none vs 1). On rating, review sentiment, ads and device support 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

One Calendar is free to download; Occasions 3 costs $2.99 up front. One Calendar sells 1 one-off in-app purchase. Occasions 3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Occasions 3 against 4.8 for One Calendar. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 2.4K, so its average is the more settled of the two. Written reviews are what separate them: 75% of Occasions 3's written reviews are positive against 81% of One Calendar's.

UpkeepUpdate frequency

Occasions 3 ships an update every 3 months, One Calendar fortnightly. Both last shipped on November 1, 2026.

Scorecard6 real differences · 4 level
Occasions 3 versus One Calendar: the parameters behind the verdict, then further details
ParameterOccasions 3One Calendar
Price$2.99Free — better
Rating4.8 (2.4K ratings) — better4.8 (21K ratings)
Positive reviews74.6% of reviews80.6% of reviews — better
Number of ratings2.4K21K — better
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Mac — better
Requires iOS18.615.0 — better
Further details — not scored
Size18 MB89 MB
Age rating4+12+
DeveloperHand Carved Code, LLCCode Spark

Customer experience

Occasions 3

All ratings2,404 ratings
Positive96.8%
Neutral1.6%
Negative1.5%
Written reviews291 reviews
Positive74.6%
Neutral8.2%
Negative17.2%

One Calendar

All ratings20,632 ratings
Positive95.4%
Neutral3.2%
Negative1.4%
Written reviews831 reviews
Positive80.6%
Neutral8.5%
Negative10.8%

User reviews

Occasions 3

From 2.4K App Store ratings

What we love

  • 🚀 Useful calendar
  • 👍 Outstanding app
  • 👍 Excellent app
  • 👍 Great app
  • 👍 Reliable and fun to use

Room to improve

  • 🐛 Annoying app
  • 🐛 Duplicate notifications
  • 🐛 Sync issues
  • 🐛 Duplicate notifications
  • 🐛 Duplicate notifications

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

Bugs and requests

Occasions 3

Reported bugs

5 issues
  • Duplicate notifications
  • Sync issues
  • Data loss
  • Compatibility issues with older devices
  • Facebook SDK error

Requested features

6 requests
  • Add military birthdays
  • Repeat functionality
  • Sync with Apple Watch
  • Separate categories for events
  • Zodiac sign display
Show 1 more
  • Public occasion lists

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

In-app purchases

None

Occasions 3

No in-app purchases

1 purchases

One Calendar

One-time1
  • OneCalendar premium$5.99

Questions

Is Occasions 3 free?
Occasions 3 costs $2.99, with no in-app purchases.
Is One Calendar free?
One Calendar is free to download, with in-app purchases available.
Which has better reviews, Occasions 3 or One Calendar?
Occasions 3 is rated higher. Occasions 3 averages 4.8 out of 5 from 2.4K ratings, while One Calendar averages 4.8 from 21K ratings.
Do Occasions 3 or One Calendar have ads?
Neither Occasions 3 nor One Calendar shows ads.
Which is updated more often, Occasions 3 or One Calendar?
Occasions 3 ships an update every 3 months, and One Calendar fortnightly. Most recently, Occasions 3 was updated on November 1, 2026 and One Calendar on November 1, 2026.

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