Comparison

iCalendar vs Calendar Op.2

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

Head to head
About

iCalendar

This productivity app offers a seamless and highly usable interface for managing your schedule. It integrates with popular accounts, allows for custom color-coding, and provides powerful search and productivity tools. Additional features like a task manager and access to interesting calendars are available via in-app purchases.

Highlights
  • Seamless integration with iCloud, Google, Exchange, Outlook, Yahoo!
  • Customizable color-coding for events
  • Drag and drop event timing updates
  • Task manager with iOS Reminders sync
  • Time zone support and print functionality
  • Export views as PDF
  • One-touch conference call dialing
Features
Currently charting
Read full description

** A MUST-HAVE CALENDAR APP FOR EVERY IPHONE, IPAD, AND IPOD **   iCalendar is the ultimate calendar for your iPhone, iPad and iPod Touch focusing on your productivity. It’s seamless, highly usable interface allows you to enter events quickly and helps you keep track of your busy schedule. It integrates with your iCloud, Google, Exchange, Outlook, or Yahoo! account to provide you with the most convenient calendaring experience.    EASILY TRACK YOUR SCHEDULE - View your daily, weekly, monthly, and yearly schedule. - Custom color-code your events. Use predefined colors, or make up your own colors. - iCalendar implements quickest way on the market to navigate between dates  - Fast and powerful search: Search events by title, location, and notes.    NEW IN VERSION 4.0 - Task Manager: Manage your tasks within your calendar in a fun and easy manner and sync with iOS Reminders. Available as in-app purchase for USD 0.99.   FULL OF PRODUCTIVITY TOOLS - Drag and drop an event to update its timing.  - Copy and paste events. - Create custom repeating events (e.g. repeat on the third Friday every month, and many more).  - Add custom alerts/reminders for events and snooze alerts - Access your event details quickly by tapping on the event.  - Customize the visible time period (e.g. from 9:00 AM – 5:00 PM) to help you focus on most important events.    EVEN MORE - Time Zone Support: View and create your events in your preferred time zone and never get confused when you travel.  - Complete print functionality. Print daily, weekly, monthly, and yearly views.  - Export any view (day, week, month, year) as a PDF file.  - Use built-in maps to set the location of your events.  - Dial into a conference call with one touch right from iCalendar. Add phone numbers from your contacts to events with the ability to use pause and wait, which is ideal for conference calls.  - Set location of an event as the address or phone number of one of your contacts.  - Access all your events directly from the Month view - no need to go to each individual day to review full list of events.  - Use the app icon badge to indicate either the number of upcoming events or the day of the month.  - Google Calendar sync: sync all of your calendars, create and edit Google Calendar events, and use Google Calendar custom reminders (SMS, email and/or alert). - Add, edit and delete calendars right from iCalendar.  - Support of portrait and landscape to match your orientation preference.  - iCalendar is a universal app. Download once and use across all your devices.  - For more details: http://www.symfonies.com/icalendar/   iCalendar offers access to interesting calendars from Calendar Store as an optional in-app purchase.  You may subscribe to your holidays calendar (national/religious) or subscribe to interesting calendars (e.g. local/global sports events, stocks, weather, and many others).   With an optional in-app purchase yearly subscription, you get full and ongoing access to the Calendar Store including (live) updates in your calendar. A subscription always starts with a one-month free trial, so you can try before you buy. One year subscriptions for the Calendar Store costs $1.99. Payment will be charged to your iTunes Account at confirmation of purchase and after the 1 month free trial. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current 1 year period. You can turn off auto-renew at any time from your iTunes account settings. Cancellation of the current active subscription period is not allowed.   Our terms of service and privacy policy are found at http://www.symfonies.com/terms-of-service/ and http://www.symfonies.com/privacy-policy/ respectively.   If you have a question, need help or would like to request a feature, please do not hesitate to contact us. We respond to EVERY email we receive: support@symfonies.com

About

Calendar Op.2

Organize your daily schedule with a clean and minimalist calendar app. It offers seamless event management, synchronization with popular services, and a user-friendly interface for a simpler planning experience.

Highlights
  • Works with built-in iOS calendar
  • Month & list view with event titles
  • Mini pop-up for daily events
  • Seamless vertical scrolling
  • Copy & Paste for events
  • Incremental search
  • Syncs with iCloud, Google Calendar
Features
Read full description

Calendar Op.2 [opus two] is a very simple and easy-to-use calendar application designed for everyone who loves simple life. With its clean user interface and carefully selected feature set, you can organize your daily schedule smoother than ever. FEATURES: ● Works with built-in iOS calendar. ● Beautiful month & list view with event title. ● Mini pop-up window for daily events. ● Seamless vertical scrolling to the previous and next month. ● Copy & Paste for events. ● Incremental search view. ● Syncing with iCloud, Google Calendar, etc. via built-in iOS calendar.

Screenshots

iCalendar4 screens
Calendar Op.24 screens

Verdict

The call

The clearest difference is price: Calendar Op.2 at Free against iCalendar's $2.99. Calendar Op.2 also leads on update cadence (weekly vs every 3 months). iCalendar's advantage is ads (none vs shown) and chart position (#52 vs unranked). On rating, review sentiment, ratings volume and in-app purchases 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

Calendar Op.2 is free to download; iCalendar costs $2.99 up front. iCalendar sells 10 in-app purchases, starting at $1.99 per year and Calendar Op.2 sells 1 one-off in-app purchase. 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 — 4.7 for iCalendar against 4.7 for Calendar Op.2. Both are backed by a comparable volume of ratings — 5.6K and 13K respectively. Written reviews are what separate them: 71% of iCalendar's written reviews are positive against 69% of Calendar Op.2's.

UpkeepUpdate frequency

iCalendar ships an update every 3 months, Calendar Op.2 weekly. The most recent releases landed on November 10, 2026 and November 12, 2026 respectively.

Scorecard6 real differences · 5 level
iCalendar versus Calendar Op.2: the parameters behind the verdict, then further details
ParameteriCalendarCalendar Op.2
Price$2.99Free — better
Rating4.7 (5.6K ratings) — better4.7 (13K ratings)
Positive reviews71.3% of reviews — better68.5% of reviews
Number of ratings5.6K13K — better
Update frequencyEvery 3 monthsWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#52 — better—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.6 — better26.0
Further details — not scored
Size20 MB8 MB
Age rating4+4+
DeveloperSymfonies, Inc.Yoshihiro Sakamoto

Customer experience

iCalendar

All ratings5,356 ratings
Positive93.6%
Neutral2.9%
Negative3.5%
Written reviews408 reviews
Positive71.3%
Neutral8.8%
Negative19.9%

Calendar Op.2

All ratings13,495 ratings
Positive92.1%
Neutral4.5%
Negative3.4%
Written reviews127 reviews
Positive68.5%
Neutral12.6%
Negative18.9%

User reviews

iCalendar

From 5.6K App Store ratings

What we love

  • 💻 Excellent calendar app
  • 🎨 Customizable color coding
  • 📅 Comprehensive monthly view
  • 🗓️ Seamless syncing across devices
  • 🔍 Detailed event information

Room to improve

  • 🐛 Occasional data loss or sync issues
  • 🔍 Difficulty editing recurring events
  • 🔒 Concerns about security and privacy
  • 💰 Paid features that should be free
  • 🕰️ Inconsistent event time display

Calendar Op.2

From 13K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Efficient calendar view
  • 💡 Customizable color coding
  • 🔒 Secure and private
  • 🌟 Great alternative to default calendar

Room to improve

  • 🐛 Issues with date/day synchronization
  • 🔍 Limited color options
  • 📱 No iPad version
  • 🕰️ Can't schedule in 15-minute intervals
  • 🔔 Ads can be intrusive

Bugs and requests

iCalendar

Reported bugs

4 issues
  • Events disappearing or not syncing properly
  • Inability to edit or update recurring events
  • Incorrect time and location information
  • Crashes or freezes when performing certain actions

Requested features

5 requests
  • Add ability to attach files to events
  • Improve widget functionality and visibility
  • Introduce family/group calendar sharing
  • Expand color palette and theming options
  • Add yearly view and better month-to-month navigation

Calendar Op.2

Reported bugs

3 issues
  • Events disappearing from past months
  • Time zone issues when traveling
  • Inability to edit event details

Requested features

6 requests
  • Add more color options
  • Implement landscape mode
  • Allow disabling of irrelevant holidays
  • Add support for Apple Watch
  • Improve event editing functionality
Show 1 more
  • Retain past event history

In-app purchases

10 purchases

iCalendar

Subscriptions1
  • Calendar Store1 Month trial$1.991 Year
One-time9
  • Religious holidays$0.99
  • Week Numbers$0.99
  • Moon Phases calendar$0.99
Show 6 more
  • Holidays United States$0.99
  • Calendars - Pro Football USA 2014-2015 edition$0.99
  • Calendars - Pro Baseball USA 2015 edition$0.99
  • iOS Reminders$0.99
  • Calendars - Pro American Football Men United States 2015-2016 edition$0.99
  • Weather calendars$1.99
1 purchases

Calendar Op.2

One-time1
  • Remove Ads$5.99

Questions

Is iCalendar free?
iCalendar costs $2.99, and also offers in-app purchases.
Is Calendar Op.2 free?
Calendar Op.2 is free to download, with in-app purchases available.
Which has better reviews, iCalendar or Calendar Op.2?
iCalendar is rated higher. iCalendar averages 4.7 out of 5 from 5.6K ratings, while Calendar Op.2 averages 4.7 from 13K ratings.
Do iCalendar or Calendar Op.2 have ads?
Calendar Op.2 shows ads; iCalendar does not.
Which is updated more often, iCalendar or Calendar Op.2?
iCalendar ships an update every 3 months, and Calendar Op.2 weekly. Most recently, iCalendar was updated on November 10, 2026 and Calendar Op.2 on November 12, 2026.

Other comparisons