# AtCoder Alarm vs Loud Alarm Clock

The clearest difference is in-app purchases: AtCoder Alarm at none against Loud Alarm Clock's 5. AtCoder Alarm also leads on update cadence (daily vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Loud Alarm Clock sells 5 in-app purchases, starting at $3.99 per 7 days. AtCoder Alarm asks for nothing beyond the download.

AtCoder Alarm ships an update daily, Loud Alarm Clock fortnightly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | AtCoder Alarm | Loud Alarm Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/loud-alarm-clock-owlroutine/id6764564683/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Fortnightly |
| Monetization | **Free** | Freemium |
| Size | 27 MB | 122 MB |
| Requires iOS | **15.5** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kiichi Ito](https://appshunter.io/developer/1505735244) | [MARIN CAPRANOV](https://appshunter.io/developer/1853264969) |

## What reviewers say

### AtCoder Alarm

[App page](https://appshunter.io/ios/app/atcoder-alarm/id1671964226)

This alarm clock requires users to solve a simple programming problem to turn it off. Problems are randomly selected from past AtCoder "A" tasks. Ensure you wake up on time with this unique challenge.

**Highlights:** Solve programming problems to stop alarm, Random AtCoder "A" task selection, Ensures waking up, Requires AtCoder pre-registration

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

**In-app purchases:** none


### Loud Alarm Clock

[App page](https://appshunter.io/ios/app/loud-alarm-clock-owlroutine/id6764564683)

This alarm clock prevents snoozing by requiring users to complete a morning mission. It also encourages better sleep habits with guided wind-down sessions and tracks sleep patterns to help users establish a consistent schedule.

**Highlights:** Mission-based alarm deactivation, Guided wind-down sessions, Sleep tracking and analysis, Customizable alarm sounds and themes, Streak and badge rewards, Light and dark themes

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $3.99 | per 7 days |
| OwlRoutine Pro Monthly | $7.99 | per month |
| Pro Yearly | $19.99 | per year |
| OwlRoutine Pro Yearly | $39.99 | per year |
| OwlRoutine Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is AtCoder Alarm free?

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

### Is Loud Alarm Clock free?

Loud Alarm Clock is free to download, with in-app purchases available.

### Do AtCoder Alarm or Loud Alarm Clock have ads?

Neither AtCoder Alarm nor Loud Alarm Clock shows ads.

### Which is updated more often, AtCoder Alarm or Loud Alarm Clock?

AtCoder Alarm ships an update daily, and Loud Alarm Clock fortnightly. Most recently, AtCoder Alarm was updated on November 3, 2026 and Loud Alarm Clock 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.*