YaoSound vs A chang
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
YaoSound
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YaoSound APP supports Bluetooth connection, which can display the battery power of the hearing product, supports adjust volume, EQ, noise reduction, and select application scenarios.
A chang
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This APP connects to the visual earpiece device via wireless WiFi. It enables you to view the close-up camera footage directly on your mobile phone in real time. When viewing the footage, you can flip the image. You can also take photos and record videos to save the current scene in your phone's photo album. There is also a built-in album where you can view the photos and videos.
Screenshots
Verdict
The clearest difference is iOS requirement: A chang at 13 against YaoSound's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
YaoSound ships an update every 3 weeks, A chang fortnightly. The most recent releases landed on September 15, 2026 and September 20, 2026 respectively.
| Parameter | YaoSound | A chang |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13 — better |
| Further details — not scored | ||
| Size | 56 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Magnet Technology Co.,Ltd | Shenzhen Shenglong Technology Co., Ltd |
In-app purchases
YaoSound
No in-app purchases
A chang
No in-app purchases
