# Hacaro vs Keyhole Puzzle

The clearest difference is update cadence: Keyhole Puzzle at every 2 weeks against Hacaro's every 4 months. On price, ads, 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.

Hacaro ships an update every 4 months, Keyhole Puzzle every 2 weeks. The most recent releases landed on November 2, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Hacaro | Keyhole Puzzle |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 117 MB | 1 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [DIGITAL STANDARD CO., LTD.](https://appshunter.io/developer/660156728) | [順天堂大学](https://appshunter.io/developer/1080910962) |

## What reviewers say

### Hacaro

[App page](https://appshunter.io/ios/app/hacaro-strooptest/id1447081813)

**Features:** Vision Pro support

**In-app purchases:** none


### Keyhole Puzzle

[App page](https://appshunter.io/ios/app/keyhole-puzzle/id6757695861)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hacaro free?

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

### Is Keyhole Puzzle free?

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

### Do Hacaro or Keyhole Puzzle have ads?

Neither Hacaro nor Keyhole Puzzle shows ads.

### Which is updated more often, Hacaro or Keyhole Puzzle?

Hacaro ships an update every 4 months, and Keyhole Puzzle every 2 weeks. Most recently, Hacaro was updated on November 2, 2026 and Keyhole Puzzle on November 9, 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.*