# Tower Stack Challenge vs Passenger Drop

The clearest difference is update cadence: Passenger Drop at every 2 days against Tower Stack Challenge's every 17 months. Passenger Drop also leads on iOS requirement (12.0 vs 15.0). 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.

Tower Stack Challenge ships an update every 17 months, Passenger Drop every 2 days. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Tower Stack Challenge | Passenger Drop |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 17 months | **Every 2 days** |
| Size | 254 MB | 186 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAKAK](https://appshunter.io/developer/1501395145) | [RedLine Games](https://appshunter.io/developer/1050165849) |

## What reviewers say

### Tower Stack Challenge

[App page](https://appshunter.io/ios/app/tower-stack-challenge/id6737799812)

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

**In-app purchases:** none


### Passenger Drop

[App page](https://appshunter.io/ios/app/passenger-drop/id6738777758)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tower Stack Challenge free?

Tower Stack Challenge is free to download, with no in-app purchases.

### Is Passenger Drop free?

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

### Do Tower Stack Challenge or Passenger Drop have ads?

Both Tower Stack Challenge and Passenger Drop show ads.

### Which is updated more often, Tower Stack Challenge or Passenger Drop?

Tower Stack Challenge ships an update every 17 months, and Passenger Drop every 2 days. Most recently, Tower Stack Challenge was updated on October 7, 2026 and Passenger Drop on October 14, 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.*