# RespiRelax+ vs OBSERV 520

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.

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 October 21, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RespiRelax+ | OBSERV 520 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (16 ratings)](https://appshunter.io/ios/app/respirelax-plus/id515900420/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/observ-520/id781554722/reviews) |
| Number of ratings | **16** | 1 |
| Positive reviews | **69.6% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free | Free |
| Size | 84 MB | 48 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Les Thermes d'Allevard](https://appshunter.io/developer/515900423) | [InnoFaith beauty sciences](https://appshunter.io/developer/583003631) |

## 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


### OBSERV 520

[App page](https://appshunter.io/ios/app/observ-520/id781554722)

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.

**Highlights:** 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)

**In-app purchases:** none


## Frequently asked questions

### Is RespiRelax+ free?

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

### Is OBSERV 520 free?

OBSERV 520 is free to download, with no in-app purchases.

### Which has better reviews, RespiRelax+ or OBSERV 520?

RespiRelax+ is rated higher. RespiRelax+ averages 4.1 out of 5 from 16 ratings, while OBSERV 520 averages 3.0 from 1 ratings.

### Do RespiRelax+ or OBSERV 520 have ads?

Neither RespiRelax+ nor OBSERV 520 shows ads.

### Which is updated more often, RespiRelax+ or OBSERV 520?

RespiRelax+ ships an update every 3 weeks, and OBSERV 520 every 4 months. Most recently, RespiRelax+ was updated on October 21, 2026 and OBSERV 520 on October 7, 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.*