# Doomsday Trainer vs StudiesTimer

The clearest difference is review sentiment: StudiesTimer at 100% against Doomsday Trainer's 0%. StudiesTimer also leads on rating (5.0 vs 4.0). Doomsday Trainer's advantage is in-app purchases (none vs 5) and iOS requirement (15.0 vs 17.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. StudiesTimer sells 5 in-app purchases, starting at $4.99 per 7 days. Doomsday Trainer asks for nothing beyond the download.

StudiesTimer holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 0% of Doomsday Trainer's written reviews are positive against 100% of StudiesTimer's.

Doomsday Trainer ships an update every 5 days, StudiesTimer every 10 days. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Doomsday Trainer | StudiesTimer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/doomsday-trainer/id6760719687/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/studiestimer-study-timer/id6800871173/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 10 days |
| Monetization | **Free** | Freemium |
| Size | 15 MB | 70 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Maarten Claessen](https://appshunter.io/developer/1885901059) | [Hussein Ali El Gazouini](https://appshunter.io/developer/6785706683) |

## What reviewers say

### Doomsday Trainer

[App page](https://appshunter.io/ios/app/doomsday-trainer/id6760719687)

Master the Doomsday Algorithm to instantly calculate the day of the week for any historical date. Engage in timed challenges, compete against others, and practice various calculation methods to improve your speed and accuracy.

**Highlights:** Doomsday Algorithm calculation, Timed streak challenges, 1-on-1 live battles, Multiple training methods, Targeted component drills, Step-by-step tutorial

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

**In-app purchases:** none


### StudiesTimer

[App page](https://appshunter.io/ios/app/studiestimer-study-timer/id6800871173)

Track your study sessions with multiple timer modes and see your progress visually. Connect with friends to study together, compete on leaderboards, and manage tasks directly within the app. Gain insights into your study habits and share your achievements.

**Highlights:** Multiple timer modes (Pomodoro, Countdown, Stopwatch), Task list integrated with timers, Social features: friends, leaderboards, study groups, Progress tracking and analytics, Lock screen widgets and Live Activities, Streaks, levels, and achievements

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $4.99 | per 7 days |
| Premium Weekly | $4.99 | per 7 days |
| Premium Yearly | $47.99 | per year |
| Premium Yearly | $47.99 | per year |
| Premium Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Doomsday Trainer free?

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

### Is StudiesTimer free?

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

### Which has better reviews, Doomsday Trainer or StudiesTimer?

StudiesTimer is rated higher. Doomsday Trainer averages 4.0 out of 5 from 2 ratings, while StudiesTimer averages 5.0 from 2 ratings.

### Do Doomsday Trainer or StudiesTimer have ads?

Neither Doomsday Trainer nor StudiesTimer shows ads.

### Which is updated more often, Doomsday Trainer or StudiesTimer?

Doomsday Trainer ships an update every 5 days, and StudiesTimer every 10 days. Most recently, Doomsday Trainer was updated on October 15, 2026 and StudiesTimer on October 25, 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.*