# PurerAir vs Relative Wind Compass

The clearest difference is update cadence: PurerAir at fortnightly against Relative Wind Compass's every 5 months. PurerAir also leads on iOS requirement (15.0 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.

PurerAir ships an update fortnightly, Relative Wind Compass every 5 months. Both last shipped on November 5, 2026.

## The numbers

| Metric | PurerAir | Relative Wind Compass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 months |
| Size | 57 MB | 5 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [CARBON CREDIT TECHNOLOGY LTD](https://appshunter.io/developer/1839141683) | [Jared Kaeb](https://appshunter.io/developer/1770504393) |

## What reviewers say

### PurerAir

[App page](https://appshunter.io/ios/app/purerair-air-quality-tracker/id6752372471)

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

**In-app purchases:** none


### Relative Wind Compass

[App page](https://appshunter.io/ios/app/relative-wind-compass/id6772013585)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PurerAir free?

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

### Is Relative Wind Compass free?

Relative Wind Compass is free to download, with no in-app purchases.

### Do PurerAir or Relative Wind Compass have ads?

Neither PurerAir nor Relative Wind Compass shows ads.

### Which is updated more often, PurerAir or Relative Wind Compass?

PurerAir ships an update fortnightly, and Relative Wind Compass every 5 months. Most recently, PurerAir was updated on November 5, 2026 and Relative Wind Compass on November 5, 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.*