# Cardalis Pre Psy vs RespiDog

The clearest difference is update cadence: Cardalis Pre Psy at every 7 months against RespiDog's every 22 months. Cardalis Pre Psy also leads on iOS requirement (7.1 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Cardalis Pre Psy ships an update every 7 months, RespiDog every 22 months. The most recent releases landed on September 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Cardalis Pre Psy | RespiDog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/respidog/id6450118361/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 22 months |
| Monetization | — | Free |
| Size | 9 MB | 1 MB |
| Requires iOS | **7.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JAMES HOWELL](https://appshunter.io/developer/348637503) | [invoxia](https://appshunter.io/developer/413478408) |

## What reviewers say

### Cardalis Pre Psy

[App page](https://appshunter.io/ios/app/cardalis-pre-psy/id944757769)

**Features:** macOS Compatibility

**In-app purchases:** none


### RespiDog

[App page](https://appshunter.io/ios/app/respidog/id6450118361)

Easily monitor your dog's breathing rate in real-time to help detect early signs of Congestive Heart Failure. Track breaths per minute with simple taps, visualize data over time with graphs, and maintain a health journal for your pet.

**Highlights:** Real-time breathing rate tracking, Visualize respiratory data with graphs, Create a health journal for your dog, Export breathing data in CSV format, Simple tap-to-count interface

**In-app purchases:** none


## Frequently asked questions

### Is Cardalis Pre Psy free?

Cardalis Pre Psy is free to download, with no in-app purchases.

### Is RespiDog free?

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

### Do Cardalis Pre Psy or RespiDog have ads?

Neither Cardalis Pre Psy nor RespiDog shows ads.

### Which is updated more often, Cardalis Pre Psy or RespiDog?

Cardalis Pre Psy ships an update every 7 months, and RespiDog every 22 months. Most recently, Cardalis Pre Psy was updated on September 28, 2026 and RespiDog on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*