# SpO2 Watcher vs HRM Battery

The clearest difference is update cadence: HRM Battery at every 10 days against SpO2 Watcher's every 2 months. HRM Battery also leads on iOS requirement (16.0 vs 18). SpO2 Watcher's advantage is chart position (#160 vs unranked) and price ($0.99 vs $1.99). On ads, in-app purchases and device support there is nothing between them.

SpO2 Watcher costs $0.99 and HRM Battery $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SpO2 Watcher ships an update every 2 months, HRM Battery every 10 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SpO2 Watcher | HRM Battery |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Paid | — |
| Best chart rank | **#160** | — |
| Size | 8 MB | 3 MB |
| Requires iOS | 18 | **16.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [ESCAPADE GLOBAL PRIVATE LIMITED](https://appshunter.io/developer/1207530175) | [DAN URBANEK](https://appshunter.io/developer/1875347262) |

## What reviewers say

### SpO2 Watcher

[App page](https://appshunter.io/ios/app/spo2-watcher/id6756836222)

**Currently charting:** #160 Top Paid · Health & Fitness (US App Store)

This utility app restores blood oxygen level insights to your Apple Watch. It retrieves data from HealthKit and displays it on your watch face and dashboard, offering real-time readings and historical trends. Designed for privacy, your data remains on your device.

**Highlights:** Re-enable watch visibility for SpO2, Real-time blood oxygen dashboards, Advanced watch complications, 24-hour interactive history graph, Automatic background sync, 30-day trend analysis, On-device data storage

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

**In-app purchases:** none


### HRM Battery

[App page](https://appshunter.io/ios/app/hrm-battery/id6758920011)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is SpO2 Watcher free?

SpO2 Watcher costs $0.99, with no in-app purchases.

### Is HRM Battery free?

HRM Battery costs $1.99, with no in-app purchases.

### Do SpO2 Watcher or HRM Battery have ads?

Neither SpO2 Watcher nor HRM Battery shows ads.

### Which is updated more often, SpO2 Watcher or HRM Battery?

SpO2 Watcher ships an update every 2 months, and HRM Battery every 10 days. Most recently, SpO2 Watcher was updated on October 30, 2026 and HRM Battery on October 25, 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.*