# Umbrella Alarm vs 河川カメラ RiverPulse

The clearest difference is in-app purchases: Umbrella Alarm at none against 河川カメラ RiverPulse's 3. Umbrella Alarm also leads on update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 河川カメラ RiverPulse sells 3 one-off in-app purchases. Umbrella Alarm asks for nothing beyond the download.

Umbrella Alarm ships an update every 2 days, 河川カメラ RiverPulse monthly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Umbrella Alarm | 河川カメラ RiverPulse |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Monthly |
| Size | 14 MB | 101 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [SOTOCHA](https://appshunter.io/developer/501449724) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## What reviewers say

### Umbrella Alarm

[App page](https://appshunter.io/ios/app/umbrella-alarm/id6673909279)

**Features:** macOS Compatibility

**In-app purchases:** none


### 河川カメラ RiverPulse

[App page](https://appshunter.io/ios/app/riverpulse/id6787630906)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee (Regular) | $0.49 | one-time |
| Coffee (Large) | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


## Frequently asked questions

### Is Umbrella Alarm free?

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

### Is 河川カメラ RiverPulse free?

河川カメラ RiverPulse is free to download, with in-app purchases available.

### Do Umbrella Alarm or 河川カメラ RiverPulse have ads?

Both Umbrella Alarm and 河川カメラ RiverPulse show ads.

### Which is updated more often, Umbrella Alarm or 河川カメラ RiverPulse?

Umbrella Alarm ships an update every 2 days, and 河川カメラ RiverPulse monthly. Most recently, Umbrella Alarm was updated on October 30, 2026 and 河川カメラ RiverPulse on October 31, 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.*