# NPDL Competency Compass vs MLExplorer

The clearest difference is in-app purchases: NPDL Competency Compass at none against MLExplorer's 2. NPDL Competency Compass also leads on iOS requirement (15.0 vs 17.0). MLExplorer's advantage is update cadence (every 2 days vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. MLExplorer sells 2 in-app purchases, starting at $2.99 per month. NPDL Competency Compass asks for nothing beyond the download.

NPDL Competency Compass ships an update every 6 months, MLExplorer every 2 days. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | NPDL Competency Compass | MLExplorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/mlexplorer/id6760930397/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [eKadence Learning Foundation](https://appshunter.io/developer/1720003818) | [Rui Huang](https://appshunter.io/developer/1886887898) |

## What reviewers say

### NPDL Competency Compass

[App page](https://appshunter.io/ios/app/npdl-competency-compass/id6751198110)

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

**In-app purchases:** none


### MLExplorer

[App page](https://appshunter.io/ios/app/mlexplorer/id6760930397)

Prepare for machine learning engineering interviews with AI-powered insights on research papers, coding challenges, system design, and mock interviews. Access curated paper collections and practice with company-specific interview simulations.

**Highlights:** AI insights on 6,000+ ML papers, 663 coding challenges with solutions, System design walkthroughs, Paper collections around landmark research, AI mock interviews by company, 7-day free trial

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ML Explorer Pro | $2.99 | per month |
| ML Explorer Pro (Annual) | $9.99 | per year |


## Frequently asked questions

### Is NPDL Competency Compass free?

NPDL Competency Compass is free to download, with no in-app purchases.

### Is MLExplorer free?

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

### Do NPDL Competency Compass or MLExplorer have ads?

Neither NPDL Competency Compass nor MLExplorer shows ads.

### Which is updated more often, NPDL Competency Compass or MLExplorer?

NPDL Competency Compass ships an update every 6 months, and MLExplorer every 2 days. Most recently, NPDL Competency Compass was updated on October 12, 2026 and MLExplorer on October 2, 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.*