# Stack vs Master Key

The clearest difference is update cadence: Stack at every 6 days against Master Key's every 2 weeks. Stack also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Stack sells 3 in-app purchases, starting at $3.99 per month and Master Key sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Stack ships an update every 6 days, Master Key every 2 weeks. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Stack | Master Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Size | 62 MB | 11 MB |
| Requires iOS | **15.1** | 16.2 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Naveen Senapathi](https://appshunter.io/developer/1889130875) | [Shaw Zarkoub](https://appshunter.io/developer/1895860228) |

## What reviewers say

### Stack

[App page](https://appshunter.io/ios/app/stack-routine-tracker/id6761363465)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Pro Monthly | $3.99 | per month |
| Stack Pro Annual | $39.99 | per year |
| Stack Pro Lifetime | $79.99 | one-time |


### Master Key

[App page](https://appshunter.io/ios/app/master-key-manifesting/id6781839646)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Master Key Premium — Weekly | $2.99 | per 7 days |
| Master Key Premium — Annual | $49.99 | per year |


## Frequently asked questions

### Is Stack free?

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

### Is Master Key free?

Master Key is free to download, with in-app purchases available.

### Do Stack or Master Key have ads?

Neither Stack nor Master Key shows ads.

### Which is updated more often, Stack or Master Key?

Stack ships an update every 6 days, and Master Key every 2 weeks. Most recently, Stack was updated on October 28, 2026 and Master Key on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*