# Hanoi Tower vs DUET Synth

The clearest difference is in-app purchases: DUET Synth at none against Hanoi Tower's 1. DUET Synth also leads on update cadence (daily vs every 7 months). Hanoi Tower's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Hanoi Tower sells 1 one-off in-app purchase. DUET Synth asks for nothing beyond the download.

Hanoi Tower ships an update every 7 months, DUET Synth daily. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Hanoi Tower | DUET Synth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (44 ratings)](https://appshunter.io/ios/app/hanoi-tower-stack-puzzle/id1562342512/reviews)** | — |
| Number of ratings | **44** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 7 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 2 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CHENGDU MIAOZHI TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1465440799) | [todd cunningham](https://appshunter.io/developer/6805709513) |

## What reviewers say

### Hanoi Tower

[App page](https://appshunter.io/ios/app/hanoi-tower-stack-puzzle/id1562342512)

A classic logic puzzle game where players move disks between towers following specific rules. It offers multiple difficulty levels and a hint feature to help solve complex challenges. Enjoy a visually distinct experience with a dark theme option.

**Highlights:** Classic Hanoi Tower puzzle mechanics, Multiple difficulty levels (3-8 disks), Challenging levels up to 22 disks, Dark theme support, Hint feature for assistance

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $5.99 | one-time |


### DUET Synth

[App page](https://appshunter.io/ios/app/duet-synth/id6806688536)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hanoi Tower free?

Hanoi Tower is free to download, with in-app purchases available.

### Is DUET Synth free?

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

### Do Hanoi Tower or DUET Synth have ads?

Both Hanoi Tower and DUET Synth show ads.

### Which is updated more often, Hanoi Tower or DUET Synth?

Hanoi Tower ships an update every 7 months, and DUET Synth daily. Most recently, Hanoi Tower was updated on October 30, 2026 and DUET Synth on October 29, 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.*