# drillio vs NBack³

The clearest difference is review sentiment: drillio at 90% against NBack³'s 71%. NBack³'s advantage is update cadence (every 4 days vs fortnightly). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. drillio sells 3 in-app purchases, starting at $1.99 per month and NBack³ sells 1 in-app purchase, starting at $0.49 per month. Whichever you choose, the download price is not the number that matters.

drillio ships an update fortnightly, NBack³ every 4 days. The most recent releases landed on September 20, 2026 and August 14, 2026 respectively.

## The numbers

| Metric | drillio | NBack³ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (8 ratings)](https://appshunter.io/ios/app/drillio-mental-math-training/id6444734622/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | **90.0% of reviews** | 71.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 33 MB | 20 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Iida](https://appshunter.io/developer/1506522991) | [Taiki Nishimura](https://appshunter.io/developer/1780302048) |

## What reviewers say

### drillio

[App page](https://appshunter.io/ios/app/drillio-mental-math-training/id6444734622)

Enhance your calculation abilities with engaging mental math exercises. This app offers customizable practice cards for addition, subtraction, multiplication, and division, along with progress tracking to keep you motivated.

**Highlights:** Mental math cards for calculation techniques, Customizable practice modes, Progress tracking via stats tab, Engaging brain-boosting exercises, Covers addition, subtraction, multiplication, division

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| drillio PRO Monthly | $1.99 | per month |
| drillio PRO campaign | $14.99 | per year |
| drillio PRO Annual | $14.99 | per year |


### NBack³

[App page](https://appshunter.io/ios/app/nback-memory-training-game/id6745750227)

This brain training app uses the scientifically proven Dual N-Back method to enhance cognitive functions like working memory, focus, and decision-making. It offers adjustable difficulty levels and tracks progress with a visually engaging interface.

**Highlights:** Dual N-Back method, Adjustable difficulty (n=1-5), Enhances working memory, Improves inhibitory control, Develops attention skills, Progress tracking, Streak bonus system

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $0.49 | per month |


## Frequently asked questions

### Is drillio free?

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

### Is NBack³ free?

NBack³ is free to download, with in-app purchases available.

### Do drillio or NBack³ have ads?

Both drillio and NBack³ show ads.

### Which is updated more often, drillio or NBack³?

drillio ships an update fortnightly, and NBack³ every 4 days. Most recently, drillio was updated on September 20, 2026 and NBack³ on August 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*