# ABG Pro DDx vs PFT Spirometry

The clearest difference is in-app purchases: ABG Pro DDx at none against PFT Spirometry's 2. ABG Pro DDx also leads on iOS requirement (15.0 vs 26.0). PFT Spirometry's advantage is update cadence (every 2 months vs every 20 months). On price, ads and device support there is nothing between them.

Both are free to download. PFT Spirometry sells 2 in-app purchases, starting at $7.99 per month. ABG Pro DDx asks for nothing beyond the download.

ABG Pro DDx ships an update every 20 months, PFT Spirometry every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ABG Pro DDx | PFT Spirometry |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 2 months** |
| Size | 6 MB | 3 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [GDA Software](https://appshunter.io/developer/493839619) | [ABHISHEK KUMAR](https://appshunter.io/developer/1877547879) |

## What reviewers say

### ABG Pro DDx

[App page](https://appshunter.io/ios/app/abg-pro-ddx/id6450242800)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PFT Spirometry

[App page](https://appshunter.io/ios/app/pft-spirometry/id6787568741)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PFT Premium Monthly | $7.99 | per month |
| PFT Premium Yearly | $79.99 | per year |


## Frequently asked questions

### Is ABG Pro DDx free?

ABG Pro DDx is free to download, with no in-app purchases.

### Is PFT Spirometry free?

PFT Spirometry is free to download, with in-app purchases available.

### Do ABG Pro DDx or PFT Spirometry have ads?

Neither ABG Pro DDx nor PFT Spirometry shows ads.

### Which is updated more often, ABG Pro DDx or PFT Spirometry?

ABG Pro DDx ships an update every 20 months, and PFT Spirometry every 2 months. Most recently, ABG Pro DDx was updated on October 27, 2026 and PFT Spirometry on October 24, 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.*