# COMP Odour Survey vs multiple operation calculator

The clearest difference is ads: COMP Odour Survey at none against multiple operation calculator's shown. multiple operation calculator's advantage is update cadence (every 2 weeks vs every 6 months). On price, in-app purchases, device support and iOS requirement 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, multiple operation calculator every 2 weeks. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | COMP Odour Survey | multiple operation calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 45 MB | 35 MB |
| Requires iOS | **15.6** | 15.8.3 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Wood Buffalo Environmental Association](https://appshunter.io/developer/1281094252) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## 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


### multiple operation calculator

[App page](https://appshunter.io/ios/app/multiple-operation-calculator/id6499478564)

**Features:** macOS Compatibility

**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 multiple operation calculator free?

multiple operation calculator is free to download, with no in-app purchases.

### Do COMP Odour Survey or multiple operation calculator have ads?

multiple operation calculator shows ads; COMP Odour Survey does not.

### Which is updated more often, COMP Odour Survey or multiple operation calculator?

COMP Odour Survey ships an update every 6 months, and multiple operation calculator every 2 weeks. Most recently, COMP Odour Survey was updated on October 5, 2026 and multiple operation calculator on October 2, 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.*