# Big O Notation vs AlgoFox

The clearest difference is in-app purchases: Big O Notation at none against AlgoFox's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AlgoFox sells 2 in-app purchases, starting at $9.99 per month. Big O Notation asks for nothing beyond the download.

## The numbers

| Metric | Big O Notation | AlgoFox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/algofox-tech-interview-prep/id6799187306/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Monetization | — | Freemium |
| Size | 38 MB | 49 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AFTW LLC](https://appshunter.io/developer/1886356149) | [FOX3 LLC](https://appshunter.io/developer/1126040146) |

## What reviewers say

### Big O Notation

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

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

**In-app purchases:** none


### AlgoFox

[App page](https://appshunter.io/ios/app/algofox-tech-interview-prep/id6799187306)

This app offers bite-sized coding exercises focused on algorithms and data structures. Practice pattern recognition, debugging, and problem-solving skills in short, daily sessions to prepare for technical interviews.

**Highlights:** Bite-sized coding exercises, Algorithm and DSA practice, Pattern recognition training, Mistake explanations, Timed interview sessions, Progress tracking, Daily practice streaks

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AlgoFox Pro gói tháng | $9.99 | per month |
| AlgoFox Pro gói năm | $44.99 | per year |


## Frequently asked questions

### Is Big O Notation free?

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

### Is AlgoFox free?

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

### Do Big O Notation or AlgoFox have ads?

Neither Big O Notation nor AlgoFox 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.*