# drillio vs Sumflash

The clearest difference is update cadence: Sumflash at every 3 days against drillio's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

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

drillio ships an update fortnightly, Sumflash every 3 days. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | drillio | Sumflash |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 14 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Iida](https://appshunter.io/developer/1506522991) | [Toru Fukui](https://appshunter.io/developer/1888097145) |

## 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 |


### Sumflash

[App page](https://appshunter.io/ios/app/sumflash-mental-math-flash/id6816003975)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $1.99 | per month |


## Frequently asked questions

### Is drillio free?

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

### Is Sumflash free?

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

### Do drillio or Sumflash have ads?

Both drillio and Sumflash show ads.

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

drillio ships an update fortnightly, and Sumflash every 3 days. Most recently, drillio was updated on October 13, 2026 and Sumflash on October 6, 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.*