# ColdKeeper vs Kelvin

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

Both are free to download. ColdKeeper sells 1 one-off in-app purchase 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.

ColdKeeper ships an update every 2 months, Kelvin every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | ColdKeeper | Kelvin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 3 MB | 28 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Maxime SALTET](https://appshunter.io/developer/1792193612) | [Adelyons Software LLC](https://appshunter.io/developer/1889366918) |

## What reviewers say

### ColdKeeper

[App page](https://appshunter.io/ios/app/coldkeeper/id6767132561)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ColdKeeper Pro · Lifetime Unlock | $7.99 | 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 ColdKeeper free?

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

### Is Kelvin free?

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

### Do ColdKeeper or Kelvin have ads?

Neither ColdKeeper nor Kelvin shows ads.

### Which is updated more often, ColdKeeper or Kelvin?

ColdKeeper ships an update every 2 months, and Kelvin every 2 weeks. Most recently, ColdKeeper was updated on October 31, 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.*