# RespiRelax+ vs Opthy

The clearest difference is review sentiment: RespiRelax+ at 70% against Opthy's 13%. Opthy's advantage is rating (4.5 vs 4.1) and ratings volume (2.9K vs 16). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Opthy holds the better App Store score, 4.5 against 4.1. That said, the two scores are not equally well evidenced: Opthy has 2.9K ratings behind it against 16, so its average is the more settled of the two. Written reviews complicate that: 70% of RespiRelax+'s written reviews are positive against 13% of Opthy's, so the app with the better star average is not the one people write more warmly about.

RespiRelax+ ships an update every 3 weeks, Opthy monthly. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | RespiRelax+ | Opthy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (16 ratings)](https://appshunter.io/ios/app/respirelax-plus/id515900420/reviews) | **[4.5 (2.9K ratings)](https://appshunter.io/ios/app/opthy/id1624663408/reviews)** |
| Number of ratings | 16 | **2.9K** |
| Positive reviews | **69.6% of reviews** | 13.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 84 MB | 217 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Les Thermes d'Allevard](https://appshunter.io/developer/515900423) | [Luxottica Group SPA](https://appshunter.io/developer/426128459) |

## 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


### Opthy

[App page](https://appshunter.io/ios/app/opthy/id1624663408)

Measure your Pupillary Distance (PD) accurately with this app, leveraging advanced technology for personalized glasses fitting. It transforms your iPhone into a measurement device, enabling confident online prescription glasses purchases.

**Highlights:** Contactless PD measurement, Quick IPD for far vision, Order prescription glasses online, iPhone 3D body scanner, Personalized fit for glasses

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick and easy
- 📐 Accurate measurements
- 🤖 Clear instructions

**What reviewers complain about**

- 🤔 Inconsistent results
- 🤯 Difficult to use
- 🕰️ Time-consuming process
- 🔍 Lighting issues
- 🤖 Unreliable app

**Reported bugs**

- App crashes or freezes
- Face not detected despite proper lighting
- Incompatible with certain devices

**Requested features**

- Voice guidance for instructions
- Progress indicator during measurement
- Ability to save and view past measurements


## Frequently asked questions

### Is RespiRelax+ free?

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

### Is Opthy free?

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

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

Opthy is rated higher. RespiRelax+ averages 4.1 out of 5 from 16 ratings, while Opthy averages 4.5 from 2.9K ratings.

### Do RespiRelax+ or Opthy have ads?

Neither RespiRelax+ nor Opthy shows ads.

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

RespiRelax+ ships an update every 3 weeks, and Opthy monthly. Most recently, RespiRelax+ was updated on September 30, 2026 and Opthy on October 2, 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.*