# Integra® e2 cylinder app vs Carl Kammerling

The clearest difference is update cadence: Carl Kammerling at weekly against Integra® e2 cylinder app's every 6 months. Carl Kammerling also leads on iOS requirement (13.0 vs 15.0). 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.

Integra® e2 cylinder app ships an update every 6 months, Carl Kammerling weekly. The most recent releases landed on October 25, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Integra® e2 cylinder app | Carl Kammerling |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Size | 144 MB | 47 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Air Products](https://appshunter.io/developer/567487726) | [Adventoris Limited](https://appshunter.io/developer/848210364) |

## What reviewers say

### Integra® e2 cylinder app

[App page](https://appshunter.io/ios/app/integra-e2-cylinder-app/id1426018692)

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

**In-app purchases:** none


### Carl Kammerling

[App page](https://appshunter.io/ios/app/carl-kammerling/id6502636850)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Integra® e2 cylinder app free?

Integra® e2 cylinder app is free to download, with no in-app purchases.

### Is Carl Kammerling free?

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

### Do Integra® e2 cylinder app or Carl Kammerling have ads?

Neither Integra® e2 cylinder app nor Carl Kammerling shows ads.

### Which is updated more often, Integra® e2 cylinder app or Carl Kammerling?

Integra® e2 cylinder app ships an update every 6 months, and Carl Kammerling weekly. Most recently, Integra® e2 cylinder app was updated on October 25, 2026 and Carl Kammerling on September 29, 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.*