# Watch Hydration vs Pulslab

The clearest difference is update cadence: Pulslab at every 2 days against Watch Hydration's every 3 weeks. Watch Hydration's advantage is iOS requirement (17.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Watch Hydration ships an update every 3 weeks, Pulslab every 2 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Watch Hydration | Pulslab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 2 MB | 116 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Chatting](https://appshunter.io/developer/1811425476) | [Sebastian Kardos](https://appshunter.io/developer/1874716493) |

## What reviewers say

### Watch Hydration

[App page](https://appshunter.io/ios/app/watch-hydration/id6745416167)

**Features:** Apple Watch app

**In-app purchases:** none


### Pulslab

[App page](https://appshunter.io/ios/app/pulslab/id6766026989)

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

**In-app purchases:** none


## Frequently asked questions

### Is Watch Hydration free?

Watch Hydration is free to download, with no in-app purchases.

### Is Pulslab free?

Pulslab is free to download, with no in-app purchases.

### Do Watch Hydration or Pulslab have ads?

Neither Watch Hydration nor Pulslab shows ads.

### Which is updated more often, Watch Hydration or Pulslab?

Watch Hydration ships an update every 3 weeks, and Pulslab every 2 days. Most recently, Watch Hydration was updated on October 30, 2026 and Pulslab 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.*