# Perfect Air vs Smog Detect

The clearest difference is update cadence: Smog Detect at every 2 weeks against Perfect Air's every 5 weeks. Perfect Air's advantage is iOS requirement (13.4 vs 26.0). 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.

Perfect Air ships an update every 5 weeks, Smog Detect every 2 weeks. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Perfect Air | Smog Detect |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Size | 22 MB | 3 MB |
| Requires iOS | **13.4** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Slamka Consulting](https://appshunter.io/developer/1659196939) | [ANTONIN PAVLIK](https://appshunter.io/developer/1872492381) |

## What reviewers say

### Perfect Air

[App page](https://appshunter.io/ios/app/perfect-air/id6448851304)

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

**In-app purchases:** none


### Smog Detect

[App page](https://appshunter.io/ios/app/smog-detect/id6758353585)

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

**In-app purchases:** none


## Frequently asked questions

### Is Perfect Air free?

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

### Is Smog Detect free?

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

### Do Perfect Air or Smog Detect have ads?

Neither Perfect Air nor Smog Detect shows ads.

### Which is updated more often, Perfect Air or Smog Detect?

Perfect Air ships an update every 5 weeks, and Smog Detect every 2 weeks. Most recently, Perfect Air was updated on October 25, 2026 and Smog Detect on October 28, 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.*