# CO2 Fermentation Calculator vs Aeshna

The clearest difference is in-app purchases: CO2 Fermentation Calculator at none against Aeshna's 10. CO2 Fermentation Calculator also leads on iOS requirement (11.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Aeshna sells 10 in-app purchases, starting at $4.99 per month. CO2 Fermentation Calculator asks for nothing beyond the download.

## The numbers

| Metric | CO2 Fermentation Calculator | Aeshna |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Size | 34 MB | 57 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Logico2 International AB](https://appshunter.io/developer/1208875120) | [Shenzhen Seize Times E-Commerce Co., Ltd.](https://appshunter.io/developer/368397197) |

## What reviewers say

### CO2 Fermentation Calculator

[App page](https://appshunter.io/ios/app/co2-fermentation-calculator/id6446313736)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aeshna

[App page](https://appshunter.io/ios/app/aeshna/id6758001353)

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Viewra Models (Monthly) | $4.99 | per month |
| Viewra BIMs (Monthly) | $4.99 | per month |
| Viewra Complete (Monthly) | $6.99 | per month |
| Viewra Models (Yearly) | $34.99 | per year |
| Viewra BIMs (Monthly) | $34.99 | per year |
| Viewra Complete (Yearly) | $49.99 | per year |
| Viewra Drawings (Lifetime) | $39.99 | one-time |
| Viewra Models (Lifetime) | $69.99 | one-time |
| Viewra BIMs (Lifetime) | $69.99 | one-time |
| Viewra Complete (Lifetime) | $99.99 | one-time |


## Frequently asked questions

### Is CO2 Fermentation Calculator free?

CO2 Fermentation Calculator is free to download, with no in-app purchases.

### Is Aeshna free?

Aeshna is free to download, with in-app purchases available.

### Do CO2 Fermentation Calculator or Aeshna have ads?

Neither CO2 Fermentation Calculator nor Aeshna shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*