RespiRelax+ vs OBSERV 520
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Personalized breathing programs
- Stress management exercises
- Cardiac coherence training
- Offline practice mode
- Adjustable session duration
- Soothing visual and sound environments
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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
OBSERV 520
This professional skin analysis tool uses an iPad and specialized device to visualize skin conditions not visible to the naked eye. It aids in diagnosing, planning treatments, and advising clients on personalized skincare and product recommendations. The app allows for easy capture and comparison of before-and-after images to monitor treatment progress.
- Full-face skin analysis
- Epidermal and dermal layer diagnosis
- Targeted treatment planning
- Personalized product advice
- Live visualization of skin conditions
- Before and after image monitoring
- Multiple light modes (Daylight, Wood's/UV/Cross/Parallel Polarization)
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OBSERV® 520 Professional skin analysis The OBSERV® 520 is the ultimate full-face skin analyzing device. It can be used widely from cosmetic development and evaluation, professional skin care advice, aesthetic treatment planning, self-assessment to communication and marketing. OBSERV® Professional full-face skin analysis with the iPad Using the OBSERV® 520 in combination with an iPad provides you with an accurate tool to diagnose your client's skin conditions at both epidermal and dermal layer. The different analysis modes offer you clear, sharp and detailed views of the facial skin and assist you in making a targeted treatment plan and/or giving personalized product advice in full confidence. Seeing is believing Using this App, your iPad and the OBSERV® 520 allows you to make a live visualization of your clients’ skin conditions that are not visible to the naked eye and hence often unknown. By visualizing this you can make your clients aware of skin concerns that are developing in the deeper layers of the skin but that haven’t yet surfaced and propose preventive treatment options. Monitoring treatment progress Shot a picture session in just 30 seconds and thanks to the App, store and retrieve the pictures of your clients of the current and past sessions. Reproduce perfectly aligned before and after pictures supporting you in monitoring facial appearance changes and the progress of your treatment plans. Easy-to-use App controls The App controls the OBSERV® 520 via Bluetooth 4.0 and offers you the possibility to switch between the different light modes at any time during your skin consultation. The daylight illumination mode option allows you and your client to observe how identified skin conditions manifest themselves in the daylight. By switching between the Wood's/UV/Cross/Parallel Polarization modes, the manifestation of skin conditions can be studied in great detail. Thereby you can modify the build-up of the spectral components and enhance the appearance of particular skin conditions. In the automatic mode, the system acquires sequentially all the images for a complete skin analysis session. Each of these picture sessions can be stored in the client database and can be retrieved later for comparison and evaluation.
Screenshots
Verdict
The clearest difference is rating: RespiRelax+ at 4.1 against OBSERV 520's 3.0. RespiRelax+ also leads on review sentiment (70% vs 33%) and update cadence (every 3 weeks vs every 4 months). OBSERV 520's advantage is iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
RespiRelax+ holds the better App Store score, 4.1 against 3.0. That said, the two scores are not equally well evidenced: RespiRelax+ has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 70% of RespiRelax+'s written reviews are positive against 33% of OBSERV 520's.
RespiRelax+ ships an update every 3 weeks, OBSERV 520 every 4 months. The most recent releases landed on September 25, 2026 and June 4, 2026 respectively.
| Parameter | RespiRelax+ | OBSERV 520 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (16 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 69.6% of reviews — better | 33.3% of reviews |
| Number of ratings | 16 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 84 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Les Thermes d'Allevard | InnoFaith beauty sciences B.V. |
Customer experience
RespiRelax+
OBSERV 520
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
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- 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
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- 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
OBSERV 520
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RespiRelax+
No in-app purchases
OBSERV 520
No in-app purchases








