# Cold Mastery vs Kelvin

The clearest difference is update cadence: Cold Mastery at every 3 days against Kelvin's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Cold Mastery sells 3 in-app purchases, starting at $4.99 per month and Kelvin sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Cold Mastery ships an update every 3 days, Kelvin every 2 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Cold Mastery | Kelvin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 15 MB | 28 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Fabian Weiss](https://appshunter.io/developer/6781699103) | [Adelyons Software LLC](https://appshunter.io/developer/1889366918) |

## What reviewers say

### 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 |


### Kelvin

[App page](https://appshunter.io/ios/app/kelvin-cold-plunge-tracker/id6785230298)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kelvin+ Monthly | $3.99 | per month |
| Kelvin+ Annual | $19.99 | per year |
| Kelvin+ Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Cold Mastery free?

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

### Is Kelvin free?

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

### Do Cold Mastery or Kelvin have ads?

Neither Cold Mastery nor Kelvin shows ads.

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

Cold Mastery ships an update every 3 days, and Kelvin every 2 weeks. Most recently, Cold Mastery was updated on November 5, 2026 and Kelvin on October 31, 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.*