# Doomsday Method vs Aritmo

The clearest difference is ads: Doomsday Method at none against Aritmo's shown. Aritmo's advantage is update cadence (every 2 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Doomsday Method sells 1 one-off in-app purchase and Aritmo sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Doomsday Method ships an update every 3 weeks, Aritmo every 2 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Doomsday Method | Aritmo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/doomsday-method-day-of-week/id6447447000/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 10 MB | 13 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Leon Grimmeisen](https://appshunter.io/developer/1654025400) | [LUCCA EMMANUEL PINELI SIMOES LTDA](https://appshunter.io/developer/1884998353) |

## What reviewers say

### Doomsday Method

[App page](https://appshunter.io/ios/app/doomsday-method-day-of-week/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 (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Doomsday Pro | $9.99 | one-time |


### Aritmo

[App page](https://appshunter.io/ios/app/aritmo/id6760564207)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aritmo Premium | $3.99 | per month |
| Aritmo Yearly Premium Access | $29.99 | per year |


## Frequently asked questions

### Is Doomsday Method free?

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

### Is Aritmo free?

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

### Do Doomsday Method or Aritmo have ads?

Aritmo shows ads; Doomsday Method does not.

### Which is updated more often, Doomsday Method or Aritmo?

Doomsday Method ships an update every 3 weeks, and Aritmo every 2 days. Most recently, Doomsday Method was updated on November 3, 2026 and Aritmo on October 31, 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.*