# drillio vs Monte Forest

The clearest difference is price: drillio at Free against Monte Forest's $0.99. drillio also leads on update cadence (fortnightly vs every 3 months). Monte Forest's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

drillio is free to download; Monte Forest costs $0.99 up front. drillio sells 3 in-app purchases, starting at $1.99 per month. Monte Forest asks for nothing beyond the download.

drillio ships an update fortnightly, Monte Forest every 3 months. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | drillio | Monte Forest |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 2 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Iida](https://appshunter.io/developer/1506522991) | [daijiro makabe](https://appshunter.io/developer/1850437524) |

## 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 |


### Monte Forest

[App page](https://appshunter.io/ios/app/monte-forest/id6757361262)

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

**In-app purchases:** none


## Frequently asked questions

### Is drillio free?

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

### Is Monte Forest free?

Monte Forest costs $0.99, with no in-app purchases.

### Do drillio or Monte Forest have ads?

drillio shows ads; Monte Forest does not.

### Which is updated more often, drillio or Monte Forest?

drillio ships an update fortnightly, and Monte Forest every 3 months. Most recently, drillio was updated on October 13, 2026 and Monte Forest on October 1, 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.*