# Deer Elf vs Rapid mental arithmetic

Deer Elf and Rapid mental arithmetic are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Deer Elf | Rapid mental arithmetic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 70 MB | 41 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [君宇 涂](https://appshunter.io/developer/1460785294) | [Gita Guha](https://appshunter.io/developer/1869265430) |

## What reviewers say

### Deer Elf

[App page](https://appshunter.io/ios/app/deer-elf-block-puzzle/id1478856441)

**In-app purchases:** none


### Rapid mental arithmetic

[App page](https://appshunter.io/ios/app/rapid-mental-arithmetic/id6757849531)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Deer Elf free?

Deer Elf is free to download, with no in-app purchases.

### Is Rapid mental arithmetic free?

Rapid mental arithmetic is free to download, with no in-app purchases.

### Do Deer Elf or Rapid mental arithmetic have ads?

Both Deer Elf and Rapid mental arithmetic show ads.

### Which is updated more often, Deer Elf or Rapid mental arithmetic?

Deer Elf ships an update every 3 weeks, and Rapid mental arithmetic every 3 weeks. Most recently, Deer Elf was updated on October 15, 2026 and Rapid mental arithmetic on October 3, 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.*