# UDTalk vs One Heart　公式アプリ

The clearest difference is in-app purchases: One Heart　公式アプリ at none against UDTalk's 2. One Heart　公式アプリ also leads on iOS requirement (12.0 vs 15.0). UDTalk's advantage is update cadence (every 10 days vs every 38 months) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. UDTalk sells 2 in-app purchases, starting at $1.99 per 7 days. One Heart　公式アプリ asks for nothing beyond the download.

UDTalk ships an update every 10 days, One Heart　公式アプリ every 38 months. The most recent releases landed on October 23, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | UDTalk | One Heart　公式アプリ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/udtalk/id666188441/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 38 months |
| Monetization | Free with in-app purchases | — |
| Size | 53 MB | 17 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Shamrock Records, Inc.](https://appshunter.io/developer/443431466) | [MASAO UENO](https://appshunter.io/developer/1437631853) |

## What reviewers say

### UDTalk

[App page](https://appshunter.io/ios/app/udtalk/id666188441)

Facilitates universal communication by translating speech and handwriting into text across devices. Ideal for bridging language barriers and supporting interactions with deaf individuals. Connects via Wi-Fi or internet for seamless real-time translation.

**Highlights:** Speech recognition translation, Handwriting recognition translation, Automatic language translation, Wi-Fi and internet connectivity, Cross-device communication, Supports deaf communication

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compact Plan (1 week) | $1.99 | per 7 days |
| Compact Plan (1 month) | $2.99 | per month |


### One Heart　公式アプリ

[App page](https://appshunter.io/ios/app/one-heart/id1437631854)

**In-app purchases:** none


## Frequently asked questions

### Is UDTalk free?

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

### Is One Heart　公式アプリ free?

One Heart　公式アプリ is free to download, with no in-app purchases.

### Do UDTalk or One Heart　公式アプリ have ads?

Neither UDTalk nor One Heart　公式アプリ shows ads.

### Which is updated more often, UDTalk or One Heart　公式アプリ?

UDTalk ships an update every 10 days, and One Heart　公式アプリ every 38 months. Most recently, UDTalk was updated on October 23, 2026 and One Heart　公式アプリ on September 15, 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.*