# Calculus vs Oyila Prep

The clearest difference is iOS requirement: Oyila Prep at 15.0 against Calculus's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Calculus sells 1 one-off in-app purchase and Oyila Prep sells 4 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Calculus ships an update weekly, Oyila Prep fortnightly. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Calculus | Oyila Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Size | 29 MB | 12 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [光浩 李](https://appshunter.io/developer/1576352133) | [CLOUDPILAR LIMITED](https://appshunter.io/developer/6780562411) |

## What reviewers say

### 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 |


### Oyila Prep

[App page](https://appshunter.io/ios/app/oyila-prep/id6781099856)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Silver Monthly | $7.99 | per month |
| Gold Monthly | $11.99 | per month |
| Silver Yearly | $79.99 | per year |
| Gold Yearly | $119.00 | per year |


## Frequently asked questions

### Is Calculus free?

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

### Is Oyila Prep free?

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

### Do Calculus or Oyila Prep have ads?

Neither Calculus nor Oyila Prep shows ads.

### Which is updated more often, Calculus or Oyila Prep?

Calculus ships an update weekly, and Oyila Prep fortnightly. Most recently, Calculus was updated on October 7, 2026 and Oyila Prep on October 14, 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.*