# Doomsday Method | Mental Game vs DevLokos

The clearest difference is device support: DevLokos at 3 against Doomsday Method | Mental Game's 1. DevLokos also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, 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 Method | Mental Game ships an update every 4 months, DevLokos every 5 months. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Doomsday Method | Mental Game | DevLokos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/doomsday-method-mental-game/id6447447000/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Free | — |
| Size | 11 MB | 109 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Leon Grimmeisen](https://appshunter.io/developer/1654025400) | [Kevinho Morales](https://appshunter.io/developer/1374018117) |

## 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


### DevLokos

[App page](https://appshunter.io/ios/app/devlokos/id6754109507)

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

**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 DevLokos free?

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

### Do Doomsday Method | Mental Game or DevLokos have ads?

Neither Doomsday Method | Mental Game nor DevLokos shows ads.

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

Doomsday Method | Mental Game ships an update every 4 months, and DevLokos every 5 months. Most recently, Doomsday Method | Mental Game was updated on September 21, 2026 and DevLokos on September 17, 2026.

---

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