# RespiRelax+ vs OxyKnight

RespiRelax+ and OxyKnight both sit at 4.1 stars, but that hides the real split: 70% of RespiRelax+'s written reviews are positive against 50% of OxyKnight's. OxyKnight's advantage is iOS requirement (13.0 vs 15.6). On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.1 for RespiRelax+ against 4.0 for OxyKnight. Both are backed by a comparable volume of ratings — 16 and 12 respectively. Written reviews are what separate them: 70% of RespiRelax+'s written reviews are positive against 50% of OxyKnight's.

RespiRelax+ ships an update every 3 weeks, OxyKnight fortnightly. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | RespiRelax+ | OxyKnight |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (16 ratings)](https://appshunter.io/ios/app/respirelax-plus/id515900420/reviews)** | [4.0 (12 ratings)](https://appshunter.io/ios/app/oxyknight/id1631825159/reviews) |
| Number of ratings | **16** | 12 |
| Positive reviews | **69.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 84 MB | 48 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Les Thermes d'Allevard](https://appshunter.io/developer/515900423) | [CMI Health Inc.](https://appshunter.io/developer/1054521049) |

## What reviewers say

### RespiRelax+

[App page](https://appshunter.io/ios/app/respirelax-plus/id515900420)

Improve your breathing and manage stress with guided exercises. This app offers personalized programs and offline functionality for consistent practice, promoting well-being and cardiac coherence.

**Highlights:** Personalized breathing programs, Stress management exercises, Cardiac coherence training, Offline practice mode, Adjustable session duration, Soothing visual and sound environments

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

**In-app purchases:** none

**What reviewers like**

- ✨ Effective for anxiety management
- 🧘‍♀️ Calming and relaxing experience
- 👍 Simple and intuitive interface
- 🆓 Free to use
- 🔒 Respects data privacy

**What reviewers complain about**

- 🎶 Old music preferred by many
- 🔔 Aggressive end-of-session sound
- 🔊 Sound issues reported
- 📱 Lack of Apple Watch integration
- 🎨 New design less appealing to some

**Reported bugs**

- Custom session timing not constant
- Progressive sound option disappeared
- Sound settings not remembered
- Customization option not functional
- Cannot use with headphones

**Requested features**

- Apple Watch integration
- Customizable hold/apnea phases
- Ability to combine sessions
- Add duration of apnea for experts
- Calendar/progress tracking


### OxyKnight

[App page](https://appshunter.io/ios/app/oxyknight/id1631825159)

This app works with compatible smart oximeter devices to monitor and record overnight pulse oximetry. It provides detailed sleep reports with SpO2 and PR trends, customizable alarms, and spot-checking capabilities for oxygen saturation and respiration rate.

**Highlights:** Overnight HRPO monitoring, Sleep reports with SpO2/PR trends, Customizable SpO2/PR alarms, Spot Check SpO2, PR, Respiration Rate, Bluetooth device connection, Shareable sleep data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RespiRelax+ free?

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

### Is OxyKnight free?

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

### Which has better reviews, RespiRelax+ or OxyKnight?

RespiRelax+ is rated higher. RespiRelax+ averages 4.1 out of 5 from 16 ratings, while OxyKnight averages 4.0 from 12 ratings.

### Do RespiRelax+ or OxyKnight have ads?

Neither RespiRelax+ nor OxyKnight shows ads.

### Which is updated more often, RespiRelax+ or OxyKnight?

RespiRelax+ ships an update every 3 weeks, and OxyKnight fortnightly. Most recently, RespiRelax+ was updated on October 29, 2026 and OxyKnight on October 22, 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.*