# 撃退アラーム vs Bijoux Note

The clearest difference is review sentiment: Bijoux Note at 100% against 撃退アラーム's 22%. Bijoux Note also leads on in-app purchases (none vs 2) and update cadence (every 4 days vs every 3 months). 撃退アラーム's advantage is iOS requirement (10.3 vs 18.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. 撃退アラーム sells 2 in-app purchases, starting at $1.49 per month. Bijoux Note asks for nothing beyond the download.

撃退アラーム ships an update every 3 months, Bijoux Note every 4 days. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 撃退アラーム | Bijoux Note |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 22.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 38 MB | 48 MB |
| Requires iOS | **10.3** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [株式会社DONIKA](https://appshunter.io/developer/1078148699) | [saki kobayashi](https://appshunter.io/developer/6801192843) |

## What reviewers say

### 撃退アラーム

[App page](https://appshunter.io/ios/app/id1265002239)

This safety app activates a loud alarm and sends an emergency email to contacts when you shake your phone. It offers various warning sounds and customizable options to deter threats and call for help when you cannot speak.

**Highlights:** Shake to activate alarm, Long press or tap to activate, Multiple loud warning sounds, Customizable warning sounds, Emergency email alerts, Automatic timer shutdown

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 緊急メール送信機能1ヶ月 | $1.49 | per month |
| 緊急メール送信機能12ヶ月 | $6.49 | per year |


### Bijoux Note

[App page](https://appshunter.io/ios/app/bijoux-note/id6801192841)

Manage your jewelry collection by registering pieces with photos, details like brand and material, and purchase history. Create wishlists, track maintenance, and record custom creations or reforms. Save precious memories and information about your treasured items.

**Highlights:** Register jewelry with photos and details, Organize by brand, material, and gemstone, Create and manage wishlists, Record purchase, wear, and maintenance history, Document custom jewelry and reforms, Save web-found jewelry via sharing

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

**In-app purchases:** none


## Frequently asked questions

### Is 撃退アラーム free?

撃退アラーム is free to download, with in-app purchases available.

### Is Bijoux Note free?

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

### Do 撃退アラーム or Bijoux Note have ads?

Neither 撃退アラーム nor Bijoux Note shows ads.

### Which is updated more often, 撃退アラーム or Bijoux Note?

撃退アラーム ships an update every 3 months, and Bijoux Note every 4 days. Most recently, 撃退アラーム was updated on October 7, 2026 and Bijoux Note on October 11, 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.*