Comparison

RespiRelax+ vs OxyKnight

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RespiRelax+

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
Read full description

Respirelax+, c'est 5 min de pratique pour 5h de bien être. Mieux respirer, mieux gérer son stress et travailler la cohérence cardiaque avec Respirelax+. L’évolution que nous vous proposons aujourd’hui intègre une facilité d’utilisation quelque soit votre niveau de pratique et permet d’aller encore plus loin grâce à un programme PERSONNALISER enrichi. Gratuite, efficace et simple d’utilisation même en mode «avion» ou «hors-ligne» grâce à une ergonomie très intuitive. Application, exercices, contenus et environnement sonore développés en collaboration avec Yves-Vincent DAVROUX, Respithérapeute, et référent respiration aux Thermes d’Allevard. Avec cette nouvelle version, il vous est désormais possible : - De gérer facilement la durée des sessions pour adapter votre pratique à vos séances au quotidien - De bénéficier d’un nouvel environnement visuel et sonore, apaisant et sobre en énergie - D’effectuer les réglages les plus adéquats en fonction de votre pratique et de vos attentes en sélectionnant le mode visuel et/ou sonore - De pratiquer les exercices hors connexion, n’importe où et de préférence en pleine nature - De pratiquer avec des écouteurs ou casque audio en mode sonore, pour vous recentrer sur votre pratique sans être dérangé par les environnements extérieurs - De coupler l’application à une enceinte nomade pour des séances collectives, en mode «avion» ou «hors-ligne», sans être dérangé par un appel Informations d’usage complémentaire : - Pour les débutants, commencez toujours par le mode DEBUTER - Encouragez une pratique régulière, au moins 1 fois par jour, pour en vérifier les effets - Préférez une fréquence des séances soutenable - Intégrez les exercices comme une philosophie de vie, de réconciliation avec soi, avec la nature - Ne jamais forcer - Si la tête tourne et si une gêne respiratoire survient, arrêtez la séance et reprenez une respiration naturelle - Favorisez une respiration ample, douce et calme avec le diaphragme - Avancez par étape et prenez le temps d’intégrer les programmes progressivement - Disponible sur Apple Store et Google Store Cette application a été développée par les Thermes d’Allevard (Isère-France), Pour aller plus loin : https://respirelax.eu Ambiance sonore : Studio AUDIOBLEND- Roubaix

About

OxyKnight

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
Read full description

The updated OxyKnight® App is now compatible with multiple CMI Health smart oximeters including the OxyKnight® Watch, the OxyKnight® Watch Lite, and the OxyKnight® Finger. The OxyKnight® Watch and Watch Lite are perfect for anyone who snores, who feels not fully rested after sleep, has sleep disorders or oxygen issues, or people who may need to be monitored during sleep. They are very comfortable to wear and operate continuously throughout the night. It’s made with a soft, flexible fingertip cup and adjustable wrist strap for simple use. Just 1 tap within the App to connect the Watch with the OxyKnight® App via Bluetooth. The OxyKnight® Finger is a clinical-grade smart fingertip oximeter designed for home use, sports, and aviation. Check your oxygen saturation anytime, anywhere, and sync results effortlessly with the OxyKnight® App. FEATURES (Need the compatible and designated OxyKnight® device for the specific functionality) - Monitors and records HRPO (High-Resolution Pulse Oximetry) overnight - Sleep report includes SpO2 and PR trend graph, and a series of statistics. Easy to share with family members or doctors. - Trend data for sleep quality, SpO2, and PR - Customizable SpO2 and PR alarms - Spot Check SpO2, PR, and Respiration Rate Disclaimer: Please always seek a doctor’s advice before making any medical decisions.

Screenshots

RespiRelax+4 screens
OxyKnight4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard2 real differences · 8 level
RespiRelax+ versus OxyKnight: the parameters behind the verdict, then further details
ParameterRespiRelax+OxyKnight
PriceFreeFree
Rating4.1 (16 ratings) — better4.0 (12 ratings)
Positive reviews69.6% of reviews — better50.0% of reviews
Number of ratings16 — better12
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size84 MB48 MB
Age rating4+4+
DeveloperLes Thermes d'AllevardCMI Health Inc.

Customer experience

RespiRelax+

All ratings16 ratings
Positive81.3%
Neutral0.0%
Negative18.8%
Written reviews92 reviews
Positive69.6%
Neutral12.0%
Negative18.5%

OxyKnight

All ratings8 ratings
Positive62.5%
Neutral0.0%
Negative37.5%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Bugs and requests

RespiRelax+

Reported bugs

12 issues
  • Custom session timing not constant
  • Progressive sound option disappeared
  • Sound settings not remembered
  • Customization option not functional
  • Cannot use with headphones
Show 7 more
  • Sound not working on Apple devices
  • App rotation issue on iPad
  • Screen remains on after session
  • App cannot be deleted
  • Sound issues with new version
  • Grating sound at direction changes
  • Minor crackling sound

Requested features

14 requests
  • Apple Watch integration
  • Customizable hold/apnea phases
  • Ability to combine sessions
  • Add duration of apnea for experts
  • Calendar/progress tracking
Show 9 more
  • Reminders for sessions
  • Option to choose old music/sounds
  • Vibrator mode for public use
  • Screen turns off automatically
  • More contrast in colors for low vision
  • Longer inhale/exhale duration (up to 15s)
  • Ability to hold breath between breaths
  • Choice of background music for relaxation
  • Full protocol including respiration, imagination, and positive feelings

OxyKnight

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

RespiRelax+

No in-app purchases

None

OxyKnight

No in-app purchases

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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