# UltraBoard vs YYサイレンアラート

The clearest difference is in-app purchases: YYサイレンアラート at none against UltraBoard's 1. YYサイレンアラート also leads on ads (none vs shown). UltraBoard's advantage is review sentiment (80% vs 50%) and update cadence (every 2 days vs monthly). On price and device support there is nothing between them.

Both are free to download. UltraBoard sells 1 in-app purchase, starting at $8.99 per month. YYサイレンアラート asks for nothing beyond the download.

UltraBoard ships an update every 2 days, YYサイレンアラート monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | UltraBoard | YYサイレンアラート |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (190 ratings)](https://appshunter.io/ios/app/ultraboard/id1547214365/reviews)** | — |
| Number of ratings | **190** | — |
| Positive reviews | **80.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Subscription | **Free** |
| Size | 73 MB | 6 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lisfee, Inc.](https://appshunter.io/developer/1146331015) | [株式会社エクォス・リサーチ](https://appshunter.io/developer/1483010608) |

## What reviewers say

### UltraBoard

[App page](https://appshunter.io/ios/app/ultraboard/id1547214365)

Create and organize digital notes and boards using your Apple Pencil, stylus, or finger. Customize line color and width, and save your creations into categorized folders. This app offers a subscription for enhanced features.

**Highlights:** Digital whiteboard and blackboard, Apple Pencil, stylus, and finger input, Customizable line color and width, Save and categorize notes/boards, Folder organization

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gold Plan | $8.99 | per month |


### YYサイレンアラート

[App page](https://appshunter.io/ios/app/yy/id6450823634)

This utility app visualizes important sounds like sirens and alarms, alerting users through visual cues and vibrations. It helps individuals who have difficulty hearing these sounds or want to be more aware of their auditory environment. The app detects various sounds, from emergency vehicles to everyday noises.

**Highlights:** Visualizes siren sounds, Alerts via display and vibration, Detects emergency vehicle sounds, Recognizes car horns and bicycle bells, Identifies fire alarms and intercoms, Visualizes speech, music, and breaking glass sounds

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

**In-app purchases:** none


## Frequently asked questions

### Is UltraBoard free?

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

### Is YYサイレンアラート free?

YYサイレンアラート is free to download, with no in-app purchases.

### Do UltraBoard or YYサイレンアラート have ads?

UltraBoard shows ads; YYサイレンアラート does not.

### Which is updated more often, UltraBoard or YYサイレンアラート?

UltraBoard ships an update every 2 days, and YYサイレンアラート monthly. Most recently, UltraBoard was updated on November 3, 2026 and YYサイレンアラート on November 3, 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.*