# 深瞳优学 HD vs Calculus Formulas

The clearest difference is in-app purchases: 深瞳优学 HD at none against Calculus Formulas's 3. 深瞳优学 HD also leads on iOS requirement (12.0 vs 15.1). Calculus Formulas's advantage is device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Calculus Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. 深瞳优学 HD asks for nothing beyond the download.

## The numbers

| Metric | 深瞳优学 HD | Calculus Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Size | 31 MB | 48 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [煦 郭](https://appshunter.io/developer/920260942) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### 深瞳优学 HD

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

**In-app purchases:** none


### Calculus Formulas

[App page](https://appshunter.io/ios/app/calculus-formulas-calcref/id6761394165)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| CalcRef Yearly Premium | $44.99 | per year |
| CalcRef Premium Lifetime | $74.99 | 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 Formulas free?

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

### Do 深瞳优学 HD or Calculus Formulas have ads?

Neither 深瞳优学 HD nor Calculus Formulas shows ads.

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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.*