# 同步学 vs SEES HD

The clearest difference is in-app purchases: SEES HD at none against 同步学's 10. SEES HD also leads on iOS requirement (9.0 vs 13). 同步学's advantage is update cadence (fortnightly vs every 6 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. 同步学 sells 10 one-off in-app purchases. SEES HD asks for nothing beyond the download.

同步学 ships an update fortnightly, SEES HD every 6 weeks. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 同步学 | SEES HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (99 ratings)](https://appshunter.io/ios/app/id1216626596/reviews)** | — |
| Number of ratings | **99** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Size | 343 MB | 284 MB |
| Requires iOS | 13 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [深圳市方直科技股份有限公司](https://appshunter.io/developer/1018642637) | [Shenzhen Action Blue Sky Education Information Technology Development Co., Ltd.](https://appshunter.io/developer/1272526236) |

## What reviewers say

### 同步学

[App page](https://appshunter.io/ios/app/id1216626596)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 【外研新视角】配套英语VIP会员12个月 | $39.99 | one-time |
| 【湘少版】配套超级VIP会员+作文12个月 | $39.99 | one-time |
| 【粤教沪外版】配套超级VIP会员12个月 | $39.99 | one-time |
| 【粤教沪外版】配套超级会员+作文12个月 | $39.99 | one-time |
| 【粤教沪外版】配套英语VIP会员12个月 | $39.99 | one-time |
| 【重大版】配套超级VIP会员12个月 | $39.99 | one-time |
| 【重大版】配套超级会员+作文12个月 | $39.99 | one-time |
| 【重大版】配套英语VIP会员12个月 | $39.99 | one-time |
| 【粤教沪外版】配套超级VIP会员24个月 | $69.99 | one-time |
| 【重大版】配套超级VIP会员24个月 | $69.99 | one-time |


### SEES HD

[App page](https://appshunter.io/ios/app/sees-hd/id1272526237)

**In-app purchases:** none


## Frequently asked questions

### Is 同步学 free?

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

### Is SEES HD free?

SEES HD is free to download, with no in-app purchases.

### Do 同步学 or SEES HD have ads?

Neither 同步学 nor SEES HD shows ads.

### Which is updated more often, 同步学 or SEES HD?

同步学 ships an update fortnightly, and SEES HD every 6 weeks. Most recently, 同步学 was updated on October 24, 2026 and SEES HD on October 4, 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.*