# 1Calendar vs BTL.TOP

The clearest difference is in-app purchases: BTL.TOP at none against 1Calendar's 2. BTL.TOP also leads on update cadence (weekly vs every 2 weeks). 1Calendar's advantage is ads (none vs shown) and iOS requirement (11.0 vs 13.0). On price and device support there is nothing between them.

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

1Calendar ships an update every 2 weeks, BTL.TOP weekly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1Calendar | BTL.TOP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 85 MB | 81 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [KAIROS Company Limited](https://appshunter.io/developer/1495144014) | [深圳比特罗科技有限公司](https://appshunter.io/developer/1862720229) |

## What reviewers say

### 1Calendar

[App page](https://appshunter.io/ios/app/1calendar/id6451880619)

**In-app purchases (2)**

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


### BTL.TOP

[App page](https://appshunter.io/ios/app/btltop/id6756775701)

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

**In-app purchases:** none


## Frequently asked questions

### Is 1Calendar free?

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

### Is BTL.TOP free?

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

### Do 1Calendar or BTL.TOP have ads?

BTL.TOP shows ads; 1Calendar does not.

### Which is updated more often, 1Calendar or BTL.TOP?

1Calendar ships an update every 2 weeks, and BTL.TOP weekly. Most recently, 1Calendar was updated on October 27, 2026 and BTL.TOP 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.*