Calendar Op.2 vs Simple Calendar Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calendar Op.2
Organize your daily schedule with a clean and simple calendar app. It offers a beautiful month and list view with event titles, a mini pop-up for daily events, and seamless scrolling. Easily copy and paste events and search your schedule.
- Works with built-in iOS calendar
- Month & list view with event title
- Mini pop-up for daily events
- Seamless vertical scrolling
- Copy & Paste for events
- Incremental search view
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Calendar Op.2 [opus two] is a very simple and easy-to-use calendar application designed for every people 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.
Simple Calendar Tracker
Organize your schedule by tracking event occurrences across different calendars. Combine multiple calendars to identify recurring patterns and gain insights into your activities.
- Track event occurrences
- Manage separate calendars
- Combine calendars
- Identify patterns
- Schedule organization
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- Keep track of whether events occur or not in separate calendars. - Combine calendars together and find patterns.
Screenshots
Verdict
The clearest difference is rating: Calendar Op.2 at 4.7 against Simple Calendar Tracker's 3.2. Calendar Op.2 also leads on update cadence (weekly vs every 3 months) and ratings volume (13K vs 13). Simple Calendar Tracker's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price 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
Both are free to download. Calendar Op.2 sells 1 one-off in-app purchase. Simple Calendar Tracker asks for nothing beyond the download.
Calendar Op.2 holds the better App Store score, 4.7 against 3.2. That said, the two scores are not equally well evidenced: Calendar Op.2 has 13K ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 68% of Calendar Op.2's written reviews are positive against 54% of Simple Calendar Tracker's.
Calendar Op.2 ships an update weekly, Simple Calendar Tracker every 3 months. Both last shipped on October 20, 2026.
| Parameter | Calendar Op.2 | Simple Calendar Tracker |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (13K ratings) — better | 3.2 (13 ratings) |
| Positive reviews | 68.0% of reviews — better | 53.8% of reviews |
| Number of ratings | 13K — better | 13 |
| Update frequency | Weekly — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 14.5 — better |
| Further details — not scored | ||
| Size | 8 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Yoshihiro Sakamoto | Kitten Cat LLC |
Customer experience
Calendar Op.2
Simple Calendar Tracker
Bugs and requests
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
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- Retain past event history
Simple Calendar Tracker
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calendar Op.2
- Remove Ads$5.99
Simple Calendar Tracker
No in-app purchases
Questions
Is Calendar Op.2 free?
Is Simple Calendar Tracker free?
Which has better reviews, Calendar Op.2 or Simple Calendar Tracker?
Do Calendar Op.2 or Simple Calendar Tracker have ads?
Which is updated more often, Calendar Op.2 or Simple Calendar Tracker?
Other comparisons
