Luftdaten.at vs knock(1)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Luftdaten.at
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.
- Control air quality sensors
- Measure local air quality
- Sensor management
- Environmental data collection
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Control your Luftdaten.at air quality sensors with this app and measure the air quality around you.
knock(1)
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.
- 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
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Knock is a minimal, native port-knocking client for iOS. Open ports in your firewall - SSH, VPN, admin panels - by sending a saved sequence from your iPhone. Save named configurations with a host, a list of ports, a delay, and a timeout. Each port can be independently TCP or UDP. Run the sequence with a single tap and watch each knock's result stream in live. FEATURES • Save and reuse multiple host configurations • Per-port TCP or UDP selection • Configurable inter-packet delay and socket timeout • Live per-port result display • Clean SwiftUI interface, native look and feel • No tracking, no analytics, no accounts HOW IT WORKS Port knocking is a technique for opening firewall ports on demand: your server watches for a specific sequence of connection attempts (for example, TCP/7000, UDP/8000, TCP/9000), and only opens a protected service like SSH after seeing the right pattern. knock(1) lets you send those sequences from your phone, allowing you to connect to your servers on the go. COMPATIBLE knock(1)'s behavior matches the reference jvinet/knock client - if your server runs knockd, knock(1) works out of the box. PRIVACY knock(1) connects only to the hosts you configure. It does not send telemetry, does not use analytics SDKs, and does not require an account. Your saved configurations stay on your device.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Luftdaten.at | knock(1) |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 37 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Luftdaten.at | Jeffrey Cousens |
In-app purchases
Luftdaten.at
No in-app purchases
knock(1)
No in-app purchases
