# 深瞳优学 HD vs Calculus

The clearest difference is in-app purchases: 深瞳优学 HD at none against Calculus's 1. 深瞳优学 HD also leads on iOS requirement (12.0 vs 17.6). Calculus's advantage is update cadence (weekly vs every 3 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Calculus sells 1 one-off in-app purchase. 深瞳优学 HD asks for nothing beyond the download.

深瞳优学 HD ships an update every 3 weeks, Calculus weekly. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 深瞳优学 HD | Calculus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 31 MB | 29 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [煦 郭](https://appshunter.io/developer/920260942) | [光浩 李](https://appshunter.io/developer/1576352133) |

## What reviewers say

### 深瞳优学 HD

[App page](https://appshunter.io/ios/app/hd/id1315261549)

**In-app purchases:** none


### Calculus

[App page](https://appshunter.io/ios/app/calculus-learn-and-practice/id6758305500)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁全部章节 | $9.99 | one-time |


## Frequently asked questions

### Is 深瞳优学 HD free?

深瞳优学 HD is free to download, with no in-app purchases.

### Is Calculus free?

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

### Do 深瞳优学 HD or Calculus have ads?

Neither 深瞳优学 HD nor Calculus shows ads.

### Which is updated more often, 深瞳优学 HD or Calculus?

深瞳优学 HD ships an update every 3 weeks, and Calculus weekly. Most recently, 深瞳优学 HD was updated on October 3, 2026 and Calculus on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*