# Siboo vs Zen Stack Masters

The clearest difference is price: Zen Stack Masters at Free against Siboo's $1.99. Zen Stack Masters also leads on update cadence (every 4 days vs every 8 months). Siboo's advantage is in-app purchases (none vs 4) and iOS requirement (15.6 vs 18.6). On ads and device support there is nothing between them.

Zen Stack Masters is free to download; Siboo costs $1.99 up front. Zen Stack Masters sells 4 one-off in-app purchases. Siboo asks for nothing beyond the download.

Siboo ships an update every 8 months, Zen Stack Masters every 4 days. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Siboo | Zen Stack Masters |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 days** |
| Size | 743 MB | 27 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [David Anthony MARY](https://appshunter.io/developer/1720018855) | [Gal Itach](https://appshunter.io/developer/1867158254) |

## What reviewers say

### Siboo

[App page](https://appshunter.io/ios/app/siboo-boosh/id6473841498)

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

**In-app purchases:** none


### Zen Stack Masters

[App page](https://appshunter.io/ios/app/zen-stack-masters/id6758891728)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Chance Tokens | $0.99 | one-time |
| Infinite Zen Mode | $5.99 | one-time |
| 1000 Tokens Deal | $99.99 | one-time |
| Zen Master | $1000.00 | one-time |


## Frequently asked questions

### Is Siboo free?

Siboo costs $1.99, with no in-app purchases.

### Is Zen Stack Masters free?

Zen Stack Masters is free to download, with in-app purchases available.

### Do Siboo or Zen Stack Masters have ads?

Neither Siboo nor Zen Stack Masters shows ads.

### Which is updated more often, Siboo or Zen Stack Masters?

Siboo ships an update every 8 months, and Zen Stack Masters every 4 days. Most recently, Siboo was updated on October 27, 2026 and Zen Stack Masters on October 28, 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.*