# Quick mental calculation vs SCUM Time

The clearest difference is in-app purchases: Quick mental calculation at none against SCUM Time's 2. Quick mental calculation also leads on iOS requirement (12.0 vs 18.4). SCUM Time's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. SCUM Time sells 2 one-off in-app purchases. Quick mental calculation asks for nothing beyond the download.

Quick mental calculation ships an update every 11 days, SCUM Time every 6 days. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Quick mental calculation | SCUM Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/scum-time/id6746361866/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 days | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 21 MB | 4 MB |
| Requires iOS | **12.0** | 18.4 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [ERX](https://appshunter.io/developer/513941286) | [Elric Pedder](https://appshunter.io/developer/1697640589) |

## What reviewers say

### Quick mental calculation

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

**Features:** macOS Compatibility

**In-app purchases:** none


### SCUM Time

[App page](https://appshunter.io/ios/app/scum-time/id6746361866)

This app provides real-time in-game server information, including player counts and accurate time. It automatically detects server changes to keep your data current. Features include in-game timers and a clock face highlighting day and night cycles.

**Highlights:** Accurate in-game time tracking, Real-time player counts, Automatic server monitoring, In-game timers for cooking, Clock face with day/night indicators

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Servers | $1.99 | one-time |
| Tip the Developer | $3.00 | one-time |


## Frequently asked questions

### Is Quick mental calculation free?

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

### Is SCUM Time free?

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

### Do Quick mental calculation or SCUM Time have ads?

Quick mental calculation shows ads; SCUM Time does not.

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

Quick mental calculation ships an update every 11 days, and SCUM Time every 6 days. Most recently, Quick mental calculation was updated on September 29, 2026 and SCUM Time 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.*