# Doomsday Method | Mental Game vs Doomsday calculator memory

The clearest difference is rating: Doomsday calculator memory at 5.0 against Doomsday Method | Mental Game's 4.5. Doomsday calculator memory also leads on update cadence (every 8 days vs every 4 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Doomsday calculator memory holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Doomsday Method | Mental Game ships an update every 4 months, Doomsday calculator memory every 8 days. The most recent releases landed on September 29, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Doomsday Method | Mental Game | Doomsday calculator memory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/doomsday-method-mental-game/id6447447000/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/doomsday-calculator-memory/id6503307628/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 11 MB | 4 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Leon Grimmeisen](https://appshunter.io/developer/1654025400) | [Joao Vianna](https://appshunter.io/developer/592830914) |

## What reviewers say

### Doomsday Method | Mental Game

[App page](https://appshunter.io/ios/app/doomsday-method-mental-game/id6447447000)

Master the art of calculating weekdays for any date with this comprehensive educational app. Learn a proven technique, practice with interactive exercises, and track your progress to sharpen your mental arithmetic skills.

**Highlights:** Learn Doomsday Method principles, Interactive examples and tips, Dedicated training mode, Progress tracking and statistics, User-friendly interface

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

**In-app purchases:** none


### Doomsday calculator memory

[App page](https://appshunter.io/ios/app/doomsday-calculator-memory/id6503307628)

Practice and memorize a method for quickly calculating the weekday of any given date. This app is based on John Conway's 1970 mathematical system, allowing you to test your abilities without external tools.

**Highlights:** Practice date calculations, Memorize weekday method, Based on John Conway's system, No external tools needed, Test your abilities

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Doomsday Method | Mental Game free?

Doomsday Method | Mental Game is free to download, with no in-app purchases.

### Is Doomsday calculator memory free?

Doomsday calculator memory is free to download, with no in-app purchases.

### Which has better reviews, Doomsday Method | Mental Game or Doomsday calculator memory?

Doomsday calculator memory is rated higher. Doomsday Method | Mental Game averages 4.5 out of 5 from 2 ratings, while Doomsday calculator memory averages 5.0 from 1 ratings.

### Do Doomsday Method | Mental Game or Doomsday calculator memory have ads?

Neither Doomsday Method | Mental Game nor Doomsday calculator memory shows ads.

### Which is updated more often, Doomsday Method | Mental Game or Doomsday calculator memory?

Doomsday Method | Mental Game ships an update every 4 months, and Doomsday calculator memory every 8 days. Most recently, Doomsday Method | Mental Game was updated on September 29, 2026 and Doomsday calculator memory on September 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.*