# PocketDSA vs Big O Notation

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

Both are free to download. PocketDSA sells 2 in-app purchases, starting at $3.99 per month. Big O Notation asks for nothing beyond the download.

## The numbers

| Metric | PocketDSA | Big O Notation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 49 MB | 38 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ayusch Jain](https://appshunter.io/developer/1871285831) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### PocketDSA

[App page](https://appshunter.io/ios/app/pocketdsa-leetcode-practice/id6758164058)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PocketDSA Pro - Monthly | $3.99 | per month |
| PocketDSA Pro - Yearly | $34.99 | per year |


### 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 PocketDSA free?

PocketDSA 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 PocketDSA or Big O Notation have ads?

Neither PocketDSA 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.*