# LeetCode vs Rex

The clearest difference is ratings volume: LeetCode at 626 against Rex's 1. LeetCode also leads on monetization model (ad-supported vs free with in-app purchases) and iOS requirement (16.0 vs 18.6). Rex's advantage is update cadence (every 4 days vs fortnightly) and rating (5.0 vs 4.8). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. LeetCode sells 2 in-app purchases, starting at $35.00 per month and Rex sells 2 in-app purchases, starting at $11.99 per month. Whichever you choose, the download price is not the number that matters.

Rex holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: LeetCode has 626 ratings behind it against 1, so its average is the more settled of the two.

LeetCode ships an update fortnightly, Rex every 4 days. The most recent releases landed on October 19, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | LeetCode | Rex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (626 ratings)](https://appshunter.io/ios/app/leetcode/id6755816119/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rex-study-smarter/id6775703977/reviews)** |
| Number of ratings | **626** | 1 |
| Positive reviews | 44.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 110 MB | 80 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [LeetCode](https://appshunter.io/developer/1739326909) | [Oran Egbuchunam](https://appshunter.io/developer/6775544967) |

## What reviewers say

### LeetCode

[App page](https://appshunter.io/ios/app/leetcode/id6755816119)

Practice coding challenges and prepare for technical interviews on the go. Discover company-specific questions, manage your practice lists, and track your progress. Stay updated with contests and daily quests to improve your skills.

**Highlights:** Search and discover company questions, Practice coding challenges, Manage practice lists, Track personal progress, Contest registration and calendar sync, Daily challenges and quests

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LeetCode Premium Monthly | $35.00 | per month |
| LeetCode Premium Yearly | $159.00 | per year |


### Rex

[App page](https://appshunter.io/ios/app/rex-study-smarter/id6775703977)

This app offers an interactive learning experience by explaining concepts aloud and allowing users to manipulate 3D models and live charts. It consolidates notes, PDFs, and web research onto a single canvas and supports collaborative study sessions.

**Highlights:** Voice explanations of questions, Interactive 3D scenes and live charts, Consolidated study canvas, Lecture transcription and note-taking, Read-aloud functionality for notes and PDFs, Language practice with real scenes, Live collaborative study boards

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $11.99 | per month |
| Rex Pro Annual | $99.99 | per year |


## Frequently asked questions

### Is LeetCode free?

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

### Is Rex free?

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

### Which has better reviews, LeetCode or Rex?

Rex is rated higher. LeetCode averages 4.8 out of 5 from 626 ratings, while Rex averages 5.0 from 1 ratings.

### Do LeetCode or Rex have ads?

Neither LeetCode nor Rex shows ads.

### Which is updated more often, LeetCode or Rex?

LeetCode ships an update fortnightly, and Rex every 4 days. Most recently, LeetCode was updated on October 19, 2026 and Rex on October 9, 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.*