# Luftdaten.at vs knock(1)

The clearest difference is rating: knock(1) at 5.0 against Luftdaten.at's 1.0. Luftdaten.at's advantage is update cadence (every 4 weeks vs every 2 months) and device support (3 vs 1). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

knock(1) holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Luftdaten.at ships an update every 4 weeks, knock(1) every 2 months. Both last shipped on September 26, 2026.

## The numbers

| Metric | Luftdaten.at | knock(1) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/luftdatenat/id6463052660/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/knock1/id6762497209/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 37 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Luftdaten.at](https://appshunter.io/developer/1703884065) | [Jeffrey Cousens](https://appshunter.io/developer/1877690927) |

## What reviewers say

### Luftdaten.at

[App page](https://appshunter.io/ios/app/luftdatenat/id6463052660)

This utility app allows users to control their air quality sensors and measure the air quality in their surroundings. It provides a direct interface for managing your personal environmental monitoring devices.

**Highlights:** Control air quality sensors, Measure local air quality, Sensor management, Environmental data collection

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

**In-app purchases:** none


### knock(1)

[App page](https://appshunter.io/ios/app/knock1/id6762497209)

This utility app allows you to remotely open firewall ports on your server using a saved sequence of connection attempts from your iPhone. It supports TCP or UDP for each port and provides live feedback on the connection status.

**Highlights:** Save and reuse multiple host configurations, Per-port TCP or UDP selection, Configurable inter-packet delay, Live per-port result display, Native SwiftUI interface, No tracking or analytics

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

**In-app purchases:** none


## Frequently asked questions

### Is Luftdaten.at free?

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

### Is knock(1) free?

knock(1) is free to download, with no in-app purchases.

### Which has better reviews, Luftdaten.at or knock(1)?

knock(1) is rated higher. Luftdaten.at averages 1.0 out of 5 from 1 ratings, while knock(1) averages 5.0 from 1 ratings.

### Do Luftdaten.at or knock(1) have ads?

Neither Luftdaten.at nor knock(1) shows ads.

### Which is updated more often, Luftdaten.at or knock(1)?

Luftdaten.at ships an update every 4 weeks, and knock(1) every 2 months. Most recently, Luftdaten.at was updated on September 26, 2026 and knock(1) on September 26, 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.*