# Quick mental calculation vs GunStrider

The clearest difference is in-app purchases: Quick mental calculation at none against GunStrider's 13. Quick mental calculation also leads on update cadence (every 11 days vs monthly) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. GunStrider sells 12 one-off in-app purchases. Quick mental calculation asks for nothing beyond the download.

Quick mental calculation ships an update every 11 days, GunStrider monthly. The most recent releases landed on October 14, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Quick mental calculation | GunStrider |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (25 ratings)](https://appshunter.io/ios/app/gunstrider-tap-strike/id1151708424/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | — | 65.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 11 days** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 21 MB | 176 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [ERX](https://appshunter.io/developer/513941286) | [Dreamotion Inc.](https://appshunter.io/developer/1151708423) |

## What reviewers say

### Quick mental calculation

[App page](https://appshunter.io/ios/app/quick-mental-calculation/id841970890)

**Features:** macOS Compatibility

**In-app purchases:** none


### GunStrider

[App page](https://appshunter.io/ios/app/gunstrider-tap-strike/id1151708424)

Engage in stylish dual gun combat by tapping to eliminate enemies before they attack. Master combos, utilize bullet time for strategic advantage, and upgrade your character and weapons. Compete globally in this action-packed game.

**Highlights:** Tap to shoot enemies, Consecutive kill combos, Stylish dual gun action, Bullet Time slow-motion, Character and weapon upgrades, Global ranking mode

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Special fund (S) | $0.99 | one-time |
| "Prisoner" Brando | $1.99 | one-time |
| Muffler of Sacrifice | $2.99 | one-time |
| Player Character : Maria | $3.99 | one-time |
| "GunFighter" Rabbit | $3.99 | one-time |
| Legacy of Revolutionary | $3.99 | one-time |
| Special fund (L) | $3.99 | one-time |
| "Godfather" Brando | $3.99 | one-time |
| The heritage of Mafia | $3.99 | one-time |
| Invention of scientists | $3.99 | one-time |
| Charismatic Brando Package | $6.99 | one-time |
| Lovely Rabbit Package | $6.99 | one-time |


## Frequently asked questions

### Is Quick mental calculation free?

Quick mental calculation is free to download, with no in-app purchases.

### Is GunStrider free?

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

### Do Quick mental calculation or GunStrider have ads?

Both Quick mental calculation and GunStrider show ads.

### Which is updated more often, Quick mental calculation or GunStrider?

Quick mental calculation ships an update every 11 days, and GunStrider monthly. Most recently, Quick mental calculation was updated on October 14, 2026 and GunStrider on October 22, 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.*