# Forecast Clock vs 空玉

The clearest difference is in-app purchases: Forecast Clock at none against 空玉's 3. Forecast Clock also leads on iOS requirement (14.0 vs 17.0). 空玉's advantage is ads (none vs shown) and update cadence (every 3 days vs every 104 months). On price and device support there is nothing between them.

Both are free to download. 空玉 sells 3 one-off in-app purchases. Forecast Clock asks for nothing beyond the download.

Forecast Clock ships an update every 104 months, 空玉 every 3 days. The most recent releases landed on November 7, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Forecast Clock | 空玉 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 104 months | **Every 3 days** |
| Size | 8 MB | 16 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Ramalingam Sivaramakrishnan](https://appshunter.io/developer/892706271) | [kiyotaka takanishi](https://appshunter.io/developer/6777109286) |

## What reviewers say

### Forecast Clock

[App page](https://appshunter.io/ios/app/forecast-clock-live/id1130755557)

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

**In-app purchases:** none


### 空玉

[App page](https://appshunter.io/ios/app/id6788443049)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ちいさな空玉 | $0.99 | one-time |
| はれた日の空玉 | $2.99 | one-time |
| 満月の空玉 | $6.99 | one-time |


## Frequently asked questions

### Is Forecast Clock free?

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

### Is 空玉 free?

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

### Do Forecast Clock or 空玉 have ads?

Forecast Clock shows ads; 空玉 does not.

### Which is updated more often, Forecast Clock or 空玉?

Forecast Clock ships an update every 104 months, and 空玉 every 3 days. Most recently, Forecast Clock was updated on November 7, 2026 and 空玉 on November 12, 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.*