# Zero vs Cold Mastery

The clearest difference is ads: Cold Mastery at none against Zero's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Zero sells 2 in-app purchases, starting at $9.99 per month and Cold Mastery sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Zero ships an update every 5 days, Cold Mastery every 3 days. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Zero | Cold Mastery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 33 MB | 15 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [WWW.UNICOSE.COM](https://appshunter.io/developer/367322767) | [Fabian Weiss](https://appshunter.io/developer/6781699103) |

## What reviewers say

### Zero

[App page](https://appshunter.io/ios/app/zero-cold-plunge/id6758989393)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero PRO Monthly | $9.99 | per month |
| Zero PRO Yearly | $69.99 | per year |


### Cold Mastery

[App page](https://appshunter.io/ios/app/cold-mastery/id6781699101)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Yearly | $29.99 | per year |
| Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Zero free?

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

### Is Cold Mastery free?

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

### Do Zero or Cold Mastery have ads?

Zero shows ads; Cold Mastery does not.

### Which is updated more often, Zero or Cold Mastery?

Zero ships an update every 5 days, and Cold Mastery every 3 days. Most recently, Zero was updated on November 9, 2026 and Cold Mastery on November 5, 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.*