# CodeNexus vs Big O Notation

The clearest difference is in-app purchases: Big O Notation at none against CodeNexus's 1. Big O Notation also leads on iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. CodeNexus sells 1 one-off in-app purchase. Big O Notation asks for nothing beyond the download.

## The numbers

| Metric | CodeNexus | Big O Notation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/codenexus/id6758404546/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 48 MB | 38 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Jordan Schilling](https://appshunter.io/developer/1872761170) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### CodeNexus

[App page](https://appshunter.io/ios/app/codenexus/id6758404546)

Master coding interviews with focused learning paths and real-world problems. Prepare strategically anytime, anywhere, without subscriptions. Built for results, it helps you gain an edge in tech interviews.

**Highlights:** Master data structures and algorithms, Solve real-world interview problems, Focused learning paths, Distraction-free coding experience, Pattern recognition focus, Multiple difficulty levels

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $14.99 | 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 CodeNexus free?

CodeNexus 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 CodeNexus or Big O Notation have ads?

Neither CodeNexus nor Big O Notation 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.*