# Learn Kotlin vs Big O Notation

The clearest difference is in-app purchases: Big O Notation at none against Learn Kotlin's 4. Big O Notation also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Learn Kotlin sells 4 in-app purchases, starting at $4.99 per 7 days. Big O Notation asks for nothing beyond the download.

## The numbers

| Metric | Learn Kotlin | Big O Notation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | — |
| Size | 71 MB | 38 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MEHMET CANKER (TR)](https://appshunter.io/developer/1565350155) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### Learn Kotlin

[App page](https://appshunter.io/ios/app/learn-kotlin-jvm-and-compose/id6739499371)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $4.99 | per 7 days |
| Monthly Subscription | $6.99 | per month |
| Yearly Subscription | $24.99 | per year |
| Lifetime Subscription | $59.99 | one-time |


### Big O Notation

[App page](https://appshunter.io/ios/app/big-o-notation/id6771656290)

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

**In-app purchases:** none


## Frequently asked questions

### Is Learn Kotlin free?

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

### Is Big O Notation free?

Big O Notation is free to download, with no in-app purchases.

### Do Learn Kotlin or Big O Notation have ads?

Learn Kotlin shows ads; Big O Notation does not.

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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.*