# ClearKey Calc vs Chirpy

The clearest difference is device support: ClearKey Calc at 3 against Chirpy's 1. ClearKey Calc also leads on iOS requirement (15.1 vs 17.0). On price, 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.

## The numbers

| Metric | ClearKey Calc | Chirpy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/chirpy-puzzle-alarm-clock/id6780441126/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Free |
| Size | 30 MB | 11 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [鹏飞 陈](https://appshunter.io/developer/1891216752) | [Rudrakshi Patel](https://appshunter.io/developer/6775265360) |

## What reviewers say

### ClearKey Calc

[App page](https://appshunter.io/ios/app/clearkey-calc/id6761746376)

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

**In-app purchases:** none


### Chirpy

[App page](https://appshunter.io/ios/app/chirpy-puzzle-alarm-clock/id6780441126)

This alarm clock requires users to solve puzzles to turn off their alarms, ensuring they are fully awake. Choose from various puzzle types like math, typing, or scanning an object to get out of bed.

**Highlights:** Puzzle-based alarm dismissal, Multiple puzzle types (math, typing, color match, scan object), Customizable alarms, Earned snooze function, Clean, dark interface, No account required, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ClearKey Calc free?

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

### Is Chirpy free?

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

### Do ClearKey Calc or Chirpy have ads?

Neither ClearKey Calc nor Chirpy shows ads.

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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.*