# ColdLog vs SISU

The clearest difference is update cadence: ColdLog at weekly against SISU's fortnightly. ColdLog also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ColdLog sells 1 in-app purchase, starting at $8.99 per year and SISU sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ColdLog ships an update weekly, SISU fortnightly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ColdLog | SISU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/coldlog/id6755875822/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Freemium | — |
| Size | 17 MB | 163 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [JRSW s.r.o.](https://appshunter.io/developer/1856840734) | [Julie Nixon](https://appshunter.io/developer/1825198116) |

## What reviewers say

### ColdLog

[App page](https://appshunter.io/ios/app/coldlog/id6755875822)

Effortlessly track your cold plunge and ice bath sessions with this app. It automatically captures data like water temperature, duration, and heart rate directly from your Apple Watch, offering detailed insights and scientifically accurate calorie calculations.

**Highlights:** One-tap workout start on Apple Watch, Automatic Water Lock activation, Comprehensive data collection (temp, duration, HR), Scientifically accurate calorie calculation, Session photo gallery, Customizable share cards, HealthKit integration

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ColdLog PRO | $8.99 | per year |


### SISU

[App page](https://appshunter.io/ios/app/sisu/id6758745440)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SISU Pro | $6.99 | per month |
| SISU Pro | $34.99 | per year |
| Sisu Pro Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is ColdLog free?

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

### Is SISU free?

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

### Do ColdLog or SISU have ads?

Neither ColdLog nor SISU shows ads.

### Which is updated more often, ColdLog or SISU?

ColdLog ships an update weekly, and SISU fortnightly. Most recently, ColdLog was updated on October 28, 2026 and SISU on October 25, 2026.

---

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