# 淡江化學人 vs Calculus

The clearest difference is in-app purchases: 淡江化學人 at none against Calculus's 4. 淡江化學人 also leads on iOS requirement (15.6 vs 17.6). Calculus's advantage is update cadence (every 3 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Calculus sells 4 in-app purchases, starting at $1.99 per month. 淡江化學人 asks for nothing beyond the download.

淡江化學人 ships an update every 3 months, Calculus every 3 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 淡江化學人 | Calculus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calculus-learn-and-practice/id6758305500/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 24 MB | 109 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Wen-Chi Chou](https://appshunter.io/developer/1642680017) | [光浩 李](https://appshunter.io/developer/1576352133) |

## What reviewers say

### 淡江化學人

[App page](https://appshunter.io/ios/app/id6756286502)

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

**In-app purchases:** none


### Calculus

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

This app makes calculus intuitive with interactive animations, step-by-step worked examples, and instantly graded practice problems. It covers a full first-year calculus course, including differential equations and multivariable calculus, with features like mistake tracking and spaced review.

**Highlights:** Interactive concept animations, Worked examples with hints, Instantly graded practice problems, Mistake tracking and mastery, Spaced review system, Math-history stories, Study Desk with micro-experiments

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculus Pro Monthly | $1.99 | per month |
| Calculus Pro Yearly | $9.99 | per year |
| Unlock All Chapters | $9.99 | one-time |
| Calculus Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is 淡江化學人 free?

淡江化學人 is free to download, with no in-app purchases.

### Is Calculus free?

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

### Do 淡江化學人 or Calculus have ads?

Neither 淡江化學人 nor Calculus shows ads.

### Which is updated more often, 淡江化學人 or Calculus?

淡江化學人 ships an update every 3 months, and Calculus every 3 days. Most recently, 淡江化學人 was updated on October 25, 2026 and Calculus on October 28, 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.*