# COMP Odour Survey vs Dräger X

The clearest difference is update cadence: Dräger X at every 2 months against COMP Odour Survey's every 6 months. COMP Odour Survey's advantage is iOS requirement (15.6 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.

COMP Odour Survey ships an update every 6 months, Dräger X every 2 months. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | COMP Odour Survey | Dräger X |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 45 MB | 65 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Wood Buffalo Environmental Association](https://appshunter.io/developer/1281094252) | [Draegerwerk AG & Co. KGaA](https://appshunter.io/developer/646307986) |

## What reviewers say

### COMP Odour Survey

[App page](https://appshunter.io/ios/app/comp-odour-survey/id1281094253)

This app allows the public to report odour events in the Wood Buffalo region. The collected anonymous data helps researchers understand the relationship between odours and ambient air quality, complementing official monitoring station data.

**Highlights:** Anonymous odour reporting, Contributes to air quality research, Data complements monitoring stations, Supports Wood Buffalo Environmental Association, Community participation in environmental monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### Dräger X

[App page](https://appshunter.io/ios/app/drager-x-node/id1594368718)

**In-app purchases:** none


## Frequently asked questions

### Is COMP Odour Survey free?

COMP Odour Survey is free to download, with no in-app purchases.

### Is Dräger X free?

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

### Do COMP Odour Survey or Dräger X have ads?

Neither COMP Odour Survey nor Dräger X shows ads.

### Which is updated more often, COMP Odour Survey or Dräger X?

COMP Odour Survey ships an update every 6 months, and Dräger X every 2 months. Most recently, COMP Odour Survey was updated on October 5, 2026 and Dräger X on October 10, 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.*