# Brussels Air vs Heymdall

Brussels Air and Heymdall are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Brussels Air ships an update every 4 months, Heymdall every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Brussels Air | Heymdall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/brussels-air/id1219966021/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 24 MB | 55 MB |
| Requires iOS | 15 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bruxelles Environnement / Leefmilieu Brussel](https://appshunter.io/developer/667887462) | [Heymdall](https://appshunter.io/developer/1589752594) |

## What reviewers say

### Brussels Air

[App page](https://appshunter.io/ios/app/brussels-air/id1219966021)

Monitor real-time outdoor air pollution levels in the Brussels-Capital Region. Understand your exposure to pollutants and adapt your behavior to protect your health and contribute to better air quality.

**Highlights:** Real-time pollutant concentration tracking, Understand personal pollution exposure, Behavioral adaptation for health, Daily actions for air quality

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

**In-app purchases:** none


### Heymdall

[App page](https://appshunter.io/ios/app/heymdall/id1667483557)

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

**In-app purchases:** none


## Frequently asked questions

### Is Brussels Air free?

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

### Is Heymdall free?

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

### Do Brussels Air or Heymdall have ads?

Neither Brussels Air nor Heymdall shows ads.

### Which is updated more often, Brussels Air or Heymdall?

Brussels Air ships an update every 4 months, and Heymdall every 3 months. Most recently, Brussels Air was updated on November 2, 2026 and Heymdall on November 3, 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.*