# Doomsday calculator memory vs Doomsday Practice

The clearest difference is iOS requirement: Doomsday calculator memory at 17.6 against Doomsday Practice's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | Doomsday calculator memory | Doomsday Practice |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/doomsday-calculator-memory/id6503307628/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 days | — |
| Monetization | Free | — |
| Size | 4 MB | 1 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Joao Vianna](https://appshunter.io/developer/592830914) | [Taiyo Tsuchiya](https://appshunter.io/developer/1868015190) |

## What reviewers say

### 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


### Doomsday Practice

[App page](https://appshunter.io/ios/app/doomsday-practice/id6763708034)

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

**In-app purchases:** none


## Frequently asked questions

### Is Doomsday calculator memory free?

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

### Is Doomsday Practice free?

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

### Do Doomsday calculator memory or Doomsday Practice have ads?

Neither Doomsday calculator memory nor Doomsday Practice shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*