# Crassus vs Flue Gas Analysis

The clearest difference is update cadence: Flue Gas Analysis at every 2 months against Crassus's every 15 months. Flue Gas Analysis also leads on iOS requirement (12.2 vs 15.1). 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.

Crassus ships an update every 15 months, Flue Gas Analysis every 2 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Crassus | Flue Gas Analysis |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 76 MB | 147 MB |
| Requires iOS | 15.1 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Crassus GmbH & Co. KG](https://appshunter.io/developer/1475104093) | [Woehler Technik GmbH](https://appshunter.io/developer/959456679) |

## What reviewers say

### Crassus

[App page](https://appshunter.io/ios/app/crassus/id538410244)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flue Gas Analysis

[App page](https://appshunter.io/ios/app/flue-gas-analysis/id1666473195)

View and export flue gas analysis data from Wöhler Analyzers on your mobile device. Configure graphical displays and save measurements in various formats like PDF, CSV, and XML.

**Highlights:** Graphical and numerical display of measured values, Configuration of graphical display, Save measured values as PDF, CSV, XML, JPG, Configuration of PDF file, Export data from Wöhler Analyzers

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Crassus free?

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

### Is Flue Gas Analysis free?

Flue Gas Analysis is free to download, with no in-app purchases.

### Do Crassus or Flue Gas Analysis have ads?

Neither Crassus nor Flue Gas Analysis shows ads.

### Which is updated more often, Crassus or Flue Gas Analysis?

Crassus ships an update every 15 months, and Flue Gas Analysis every 2 months. Most recently, Crassus was updated on November 1, 2026 and Flue Gas Analysis on October 24, 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.*