# AtCoder Alarm vs Mobile Clock Pro

The clearest difference is in-app purchases: AtCoder Alarm at none against Mobile Clock Pro's 3. AtCoder Alarm also leads on update cadence (daily vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Mobile Clock Pro sells 3 one-off in-app purchases. AtCoder Alarm asks for nothing beyond the download.

AtCoder Alarm ships an update daily, Mobile Clock Pro every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | AtCoder Alarm | Mobile Clock Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mobile-clock-pro-always-on/id6756542013/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 85 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kiichi Ito](https://appshunter.io/developer/1505735244) | [Mustafa Yasar Ulutas](https://appshunter.io/developer/1861289990) |

## 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


### Mobile Clock Pro

[App page](https://appshunter.io/ios/app/mobile-clock-pro-always-on/id6756542013)

This app offers a variety of clock faces, including digital, analog, and animated designs. It functions as a bedside clock with a dark mode and includes timers, a stopwatch, and Pomodoro sessions. Premium features offer ambient sounds and music.

**Highlights:** 60+ clock designs (digital, analog, animated), Bedside clock with dark mode, Stopwatch, countdown timer, and Pomodoro, Customizable colors, fonts, and backgrounds, Weather display, Ambient sounds and music (Premium)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock One Clock | $0.99 | one-time |
| Lifetime Upgrade | $2.99 | one-time |
| Premium Version | $4.99 | one-time |


## Frequently asked questions

### Is AtCoder Alarm free?

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

### Is Mobile Clock Pro free?

Mobile Clock Pro is free to download, with in-app purchases available.

### Do AtCoder Alarm or Mobile Clock Pro have ads?

Neither AtCoder Alarm nor Mobile Clock Pro shows ads.

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

AtCoder Alarm ships an update daily, and Mobile Clock Pro every 2 weeks. Most recently, AtCoder Alarm was updated on November 3, 2026 and Mobile Clock Pro on October 30, 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.*