# 1CalendarS vs Belt

The clearest difference is in-app purchases: Belt at none against 1CalendarS's 2. 1CalendarS's advantage is device support (4 vs 2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. 1CalendarS sells 2 in-app purchases, starting at $1.99 per month. Belt asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1CalendarS | Belt |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/1calendars/id1538966367/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 193 MB | 29 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAIROS Company Limited](https://appshunter.io/developer/1495144014) | [焕财 贾](https://appshunter.io/developer/1714211977) |

## What reviewers say

### 1CalendarS

[App page](https://appshunter.io/ios/app/1calendars/id1538966367)

Efficiently manage your schedule with multiple calendar views and customizable reminders. Sync your events across all your Apple devices seamlessly. Offers a free version with an optional premium subscription for enhanced features.

**Highlights:** Day, week, month, and list views, Cross-device calendar synchronization, Customizable reminders, Edit and modify calendar entries, Free to download and use, Premium subscription for advanced features

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1CalendarS月费高级会员 | $1.99 | per month |
| 1CalendarS年费高级会员 | $19.99 | per year |


### Belt

[App page](https://appshunter.io/ios/app/belt/id6470785897)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 1CalendarS free?

1CalendarS is free to download, with in-app purchases available.

### Is Belt free?

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

### Do 1CalendarS or Belt have ads?

Neither 1CalendarS nor Belt shows ads.

### Which is updated more often, 1CalendarS or Belt?

1CalendarS ships an update every 3 weeks, and Belt every 3 weeks. Most recently, 1CalendarS was updated on October 24, 2026 and Belt on October 25, 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.*