# AtCoder Alarm vs TimerCal

The clearest difference is ads: AtCoder Alarm at none against TimerCal's shown. AtCoder Alarm also leads on update cadence (daily vs every 4 days) and iOS requirement (15.5 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

AtCoder Alarm ships an update daily, TimerCal every 4 days. The most recent releases landed on September 6, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | AtCoder Alarm | TimerCal |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 4 days |
| Monetization | Free | — |
| Size | 27 MB | 10 MB |
| Requires iOS | **15.5** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kiichi Ito](https://appshunter.io/developer/1505735244) | [Takashi Hamanaka](https://appshunter.io/developer/1707678439) |

## 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


### TimerCal

[App page](https://appshunter.io/ios/app/timercal/id6596728778)

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

**In-app purchases:** none


## Frequently asked questions

### Is AtCoder Alarm free?

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

### Is TimerCal free?

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

### Do AtCoder Alarm or TimerCal have ads?

TimerCal shows ads; AtCoder Alarm does not.

### Which is updated more often, AtCoder Alarm or TimerCal?

AtCoder Alarm ships an update daily, and TimerCal every 4 days. Most recently, AtCoder Alarm was updated on September 6, 2026 and TimerCal on September 19, 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.*