# NN direct core vs Concentration training.

The clearest difference is in-app purchases: NN direct core at none against Concentration training.'s 10. NN direct core also leads on ads (none vs shown) and iOS requirement (11.0 vs 16.0). Concentration training.'s advantage is update cadence (every 5 weeks vs every 19 months). On price and device support there is nothing between them.

Both are free to download. Concentration training. sells 10 in-app purchases, starting at $1.99 per month. NN direct core asks for nothing beyond the download.

NN direct core ships an update every 19 months, Concentration training. every 5 weeks. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | NN direct core | Concentration training. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (42 ratings)](https://appshunter.io/ios/app/concentration-training/id6462426417/reviews)** |
| Number of ratings | — | **42** |
| Positive reviews | — | 94.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 19 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 45 MB | 29 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [symmedia GmbH](https://appshunter.io/developer/1071728170) | [Olena Gotsulyak](https://appshunter.io/developer/1699979294) |

## What reviewers say

### NN direct core

[App page](https://appshunter.io/ios/app/nn-direct-core/id1533989539)

**Features:** macOS Compatibility

**In-app purchases:** none


### Concentration training.

[App page](https://appshunter.io/ios/app/concentration-training/id6462426417)

Enhance your focus, productivity, and memory with targeted exercises. This app helps combat procrastination and improve logic and reflexes through engaging training modules.

**Highlights:** Improve focus and concentration, Boost productivity and overcome procrastination, Enhance logic and reflexes, Train memory recall, Engage with Schulte table exercises, Quick decision-making tasks

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly plan | $1.99 | per month |
| Monthly subscription | $3.99 | per month |
| Annual plan | $5.99 | per year |
| Monthly subscription | $7.99 | per month |
| Monthly subscription | $14.99 | per month |
| Full version | $3.99 | one-time |
| Full version | $4.99 | one-time |
| Premium access | $7.99 | one-time |
| Full version | $9.99 | one-time |
| Full version | $19.99 | one-time |


## Frequently asked questions

### Is NN direct core free?

NN direct core is free to download, with no in-app purchases.

### Is Concentration training. free?

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

### Do NN direct core or Concentration training. have ads?

Concentration training. shows ads; NN direct core does not.

### Which is updated more often, NN direct core or Concentration training.?

NN direct core ships an update every 19 months, and Concentration training. every 5 weeks. Most recently, NN direct core was updated on October 10, 2026 and Concentration training. on October 14, 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.*