# Professional Data Engineer vs LeetCard

The clearest difference is ads: Professional Data Engineer at none against LeetCard's shown. Professional Data Engineer also leads on iOS requirement (10.0 vs 16.4). LeetCard's advantage is update cadence (every 2 days vs every 13 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Professional Data Engineer sells 1 one-off in-app purchase and LeetCard sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Professional Data Engineer ships an update every 13 months, LeetCard every 2 days. The most recent releases landed on September 6, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Professional Data Engineer | LeetCard |
| --- | --- | --- |
| 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 | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 13 months | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 124 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Trieu Tran](https://appshunter.io/developer/1668827865) | [Kubicle LLC](https://appshunter.io/developer/1679797468) |

## What reviewers say

### Professional Data Engineer

[App page](https://appshunter.io/ios/app/professional-data-engineer/id6473723698)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock complete App | $9.99 | one-time |


### 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 |


## Frequently asked questions

### Is Professional Data Engineer free?

Professional Data Engineer is free to download, with in-app purchases available.

### Is LeetCard free?

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

### Do Professional Data Engineer or LeetCard have ads?

LeetCard shows ads; Professional Data Engineer does not.

### Which is updated more often, Professional Data Engineer or LeetCard?

Professional Data Engineer ships an update every 13 months, and LeetCard every 2 days. Most recently, Professional Data Engineer was updated on September 6, 2026 and LeetCard on September 21, 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.*