# Slithor.io vs Stack Tower Up

The clearest difference is in-app purchases: Slithor.io at none against Stack Tower Up's 1. Stack Tower Up's advantage is update cadence (monthly vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stack Tower Up sells 1 one-off in-app purchase. Slithor.io asks for nothing beyond the download.

Slithor.io ships an update every 5 months, Stack Tower Up monthly. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Slithor.io | Stack Tower Up |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Size | 50 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Tarang Devani](https://appshunter.io/developer/1896586276) | [丽佳 施](https://appshunter.io/developer/1894580777) |

## What reviewers say

### Slithor.io

[App page](https://appshunter.io/ios/app/slithorio-snake-worm-arena/id6768568718)

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

**In-app purchases:** none


### Stack Tower Up

[App page](https://appshunter.io/ios/app/stack-tower-up/id6769321760)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Slithor.io free?

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

### Is Stack Tower Up free?

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

### Do Slithor.io or Stack Tower Up have ads?

Both Slithor.io and Stack Tower Up show ads.

### Which is updated more often, Slithor.io or Stack Tower Up?

Slithor.io ships an update every 5 months, and Stack Tower Up monthly. Most recently, Slithor.io was updated on October 24, 2026 and Stack Tower Up on October 7, 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.*