# Brain training calculator vs Digital Clock

The clearest difference is in-app purchases: Brain training calculator at none against Digital Clock's 1. Brain training calculator also leads on iOS requirement (15.8.3 vs 17.0). Digital Clock's advantage is ads (none vs shown) and update cadence (every 3 days vs every 2 weeks). On price and device support there is nothing between them.

Both are free to download. Digital Clock sells 1 one-off in-app purchase. Brain training calculator asks for nothing beyond the download.

Brain training calculator ships an update every 2 weeks, Digital Clock every 3 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Brain training calculator | Digital Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (6 ratings)](https://appshunter.io/ios/app/digital-clock-advance-time/id6743922826/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | — | Free |
| Size | 35 MB | 4 MB |
| Requires iOS | **15.8.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Shuichi Nagao](https://appshunter.io/developer/1181929917) |

## What reviewers say

### Brain training calculator

[App page](https://appshunter.io/ios/app/brain-training-calculator/id6502152942)

**Features:** macOS Compatibility

**In-app purchases:** none


### Digital Clock

[App page](https://appshunter.io/ios/app/digital-clock-advance-time/id6743922826)

This app offers a clean and customizable digital clock experience with large digits and a sleek interface. Personalize themes, colors, and fonts, and utilize a home screen widget for quick time checks. It also features a unique ability to advance the displayed time to help manage your schedule.

**Highlights:** Clean digital clock interface, Customizable themes and colors, Large, easy-to-read digits, Clock with seconds display, Home screen widget, Advance time feature

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Digital Clock Premium Plan | $4.99 | one-time |


## Frequently asked questions

### Is Brain training calculator free?

Brain training calculator is free to download, with no in-app purchases.

### Is Digital Clock free?

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

### Do Brain training calculator or Digital Clock have ads?

Brain training calculator shows ads; Digital Clock does not.

### Which is updated more often, Brain training calculator or Digital Clock?

Brain training calculator ships an update every 2 weeks, and Digital Clock every 3 days. Most recently, Brain training calculator was updated on November 4, 2026 and Digital Clock on October 30, 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.*