# Calendar Op.2 vs ScheduleViewer

The clearest difference is in-app purchases: ScheduleViewer at none against Calendar Op.2's 1. ScheduleViewer also leads on ads (none vs shown) and iOS requirement (17.0 vs 26.0). Calendar Op.2's advantage is update cadence (weekly vs every 2 weeks). On price and device support there is nothing between them.

Both are free to download. Calendar Op.2 sells 1 one-off in-app purchase. ScheduleViewer asks for nothing beyond the download.

Calendar Op.2 ships an update weekly, ScheduleViewer every 2 weeks. The most recent releases landed on November 5, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Calendar Op.2 | ScheduleViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (13K ratings)](https://appshunter.io/ios/app/calendar-op2-planner-and-diary/id1097430896/reviews)** | — |
| Number of ratings | **13K** | — |
| Positive reviews | 68.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 4 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yoshihiro Sakamoto](https://appshunter.io/developer/6779044478) | [Marlix Holdings, LLC](https://appshunter.io/developer/1825513588) |

## What reviewers say

### Calendar Op.2

[App page](https://appshunter.io/ios/app/calendar-op2-planner-and-diary/id1097430896)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $5.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

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

**Requested features**

- Add more color options
- Implement landscape mode
- Allow disabling of irrelevant holidays
- Add support for Apple Watch
- Improve event editing functionality


### ScheduleViewer

[App page](https://appshunter.io/ios/app/scheduleviewer/id6748970768)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calendar Op.2 free?

Calendar Op.2 is free to download, with in-app purchases available.

### Is ScheduleViewer free?

ScheduleViewer is free to download, with no in-app purchases.

### Do Calendar Op.2 or ScheduleViewer have ads?

Calendar Op.2 shows ads; ScheduleViewer does not.

### Which is updated more often, Calendar Op.2 or ScheduleViewer?

Calendar Op.2 ships an update weekly, and ScheduleViewer every 2 weeks. Most recently, Calendar Op.2 was updated on November 5, 2026 and ScheduleViewer on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*