# LeetCard vs System Design Refresher

The clearest difference is in-app purchases: System Design Refresher at none against LeetCard's 3. System Design Refresher also leads on ads (none vs shown). LeetCard's advantage is update cadence (every 2 days vs monthly) and iOS requirement (16.4 vs 26.2). On price and device support there is nothing between them.

Both are free to download. LeetCard sells 3 in-app purchases, starting at $3.99 per month. System Design Refresher asks for nothing beyond the download.

LeetCard ships an update every 2 days, System Design Refresher monthly. The most recent releases landed on September 25, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | LeetCard | System Design Refresher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (75 ratings)](https://appshunter.io/ios/app/leetcard-coding-flashcards/id6478087443/reviews)** | — |
| Number of ratings | **75** | — |
| Positive reviews | 53.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 124 MB | 18 MB |
| Requires iOS | **16.4** | 26.2 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Kubicle LLC](https://appshunter.io/developer/1679797468) | [Saurabh Sharma](https://appshunter.io/developer/1883599017) |

## What reviewers say

### LeetCard

[App page](https://appshunter.io/ios/app/leetcard-coding-flashcards/id6478087443)

Prepare for coding interviews with AI-powered flashcards and adaptive learning. Master data structures, algorithms, and coding patterns with personalized plans and intelligent hints. Track your progress with detailed analytics to identify weak areas and stay motivated.

**Highlights:** AI-powered hints, Personalized study plans, Smart flashcards, Clean organization, Personalized dashboard, Detailed analytics

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LeetCard Pro | $3.99 | per month |
| LeetCard Pro | $24.99 | per year |
| LeetCard Pro | $39.99 | one-time |


### System Design Refresher

[App page](https://appshunter.io/ios/app/system-design-refresher/id6760277935)

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

**In-app purchases:** none


## Frequently asked questions

### Is LeetCard free?

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

### Is System Design Refresher free?

System Design Refresher is free to download, with no in-app purchases.

### Do LeetCard or System Design Refresher have ads?

LeetCard shows ads; System Design Refresher does not.

### Which is updated more often, LeetCard or System Design Refresher?

LeetCard ships an update every 2 days, and System Design Refresher monthly. Most recently, LeetCard was updated on September 25, 2026 and System Design Refresher on September 12, 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.*