# 圣视尔佳弱视训练HD vs Polly自然拼读

The clearest difference is ads: Polly自然拼读 at none against 圣视尔佳弱视训练HD's shown. 圣视尔佳弱视训练HD's advantage is update cadence (every 3 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

圣视尔佳弱视训练HD ships an update every 3 weeks, Polly自然拼读 every 2 months. The most recent releases landed on September 9, 2026 and August 17, 2026 respectively.

## The numbers

| Metric | 圣视尔佳弱视训练HD | Polly自然拼读 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 1.4 GB | 203 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Kangdeshi Biotechnology Co., Ltd.](https://appshunter.io/developer/1600813148) | [LITTLE MOON PTE. LTD.](https://appshunter.io/developer/1780291442) |

## What reviewers say

### 圣视尔佳弱视训练HD

[App page](https://appshunter.io/ios/app/hd/id1600813146)

**In-app purchases:** none


### Polly自然拼读

[App page](https://appshunter.io/ios/app/polly/id6740805479)

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

**In-app purchases:** none


## Frequently asked questions

### Is 圣视尔佳弱视训练HD free?

圣视尔佳弱视训练HD is free to download, with no in-app purchases.

### Is Polly自然拼读 free?

Polly自然拼读 is free to download, with no in-app purchases.

### Do 圣视尔佳弱视训练HD or Polly自然拼读 have ads?

圣视尔佳弱视训练HD shows ads; Polly自然拼读 does not.

### Which is updated more often, 圣视尔佳弱视训练HD or Polly自然拼读?

圣视尔佳弱视训练HD ships an update every 3 weeks, and Polly自然拼读 every 2 months. Most recently, 圣视尔佳弱视训练HD was updated on September 9, 2026 and Polly自然拼读 on August 17, 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.*