# CalendarLoop vs Viewra 3D

The clearest difference is in-app purchases: CalendarLoop at none against Viewra 3D's 3. CalendarLoop also leads on update cadence (monthly vs every 4 months) and iOS requirement (13.4 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Viewra 3D sells 3 in-app purchases, starting at $2.99 per month. CalendarLoop asks for nothing beyond the download.

CalendarLoop ships an update monthly, Viewra 3D every 4 months. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | CalendarLoop | Viewra 3D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Size | 48 MB | 152 MB |
| Requires iOS | **13.4** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [MOCREO PTE. LTD.](https://appshunter.io/developer/1765266446) | [Shenzhen Seize Times E-Commerce Co., Ltd.](https://appshunter.io/developer/368397197) |

## What reviewers say

### CalendarLoop

[App page](https://appshunter.io/ios/app/calendarloop/id6743477905)

**Features:** macOS Compatibility

**In-app purchases:** none


### Viewra 3D

[App page](https://appshunter.io/ios/app/viewra-3d/id6758283083)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Viewra 3D Pro (1 Month) | $2.99 | per month |
| Viewra 3D Pro (1 Year) | $29.99 | per year |
| Viewra 3D Pro (Lifetime) | $79.99 | one-time |


## Frequently asked questions

### Is CalendarLoop free?

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

### Is Viewra 3D free?

Viewra 3D is free to download, with in-app purchases available.

### Do CalendarLoop or Viewra 3D have ads?

Neither CalendarLoop nor Viewra 3D shows ads.

### Which is updated more often, CalendarLoop or Viewra 3D?

CalendarLoop ships an update monthly, and Viewra 3D every 4 months. Most recently, CalendarLoop was updated on October 2, 2026 and Viewra 3D on October 12, 2026.

---

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