Key vs QS.on
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Key
Transform your iPhone into a mobile ID card for convenient door access. Securely register your credentials and use your phone to open doors, leveraging advanced encrypted transfer technology.
- Smartphone as mobile ID
- Convenient door opening
- Secure credential transfer
- iPhone integration
- Requires Interflex software
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Your smartphone as a mobile ID card: With the Interflex app "Key", you can conveniently open doors with your iPhone. This is how "Key" works: - Install the app on your iPhone. - Register the app with your access data. - Book with your iPhone to open doors. Thanks to "NetworkOnMobile" technology, we ensure encrypted and secure transfer of the mobile credential to your iPhone. Important: The use of this app requires the use of the Interflex software IF-6040 and suitable badge readers.
QS.on
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Welcome to QS.on, the app for carrying out structured and efficient quality inspections. Perform your site inspections with state-of-the-art software. Signature-based log recording Documentation of weak points using the built-in camera Work at any location, even without a network connection Automated mail dispatch of results Construction site scheduling from previous systems All inspections always in view Standard interfaces from upstream and downstream systems Portal-supported management system Simplest operability Cost-efficient recording of inspections A programm from practice for practitioners.
Screenshots
Verdict
The clearest difference is update cadence: QS.on at every 5 weeks against Key's every 4 months. QS.on also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support 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.
Key ships an update every 4 months, QS.on every 5 weeks. The most recent releases landed on November 2, 2026 and October 27, 2026 respectively.
| Parameter | Key | QS.on |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 4 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 205 MB |
| Age rating | 4+ | 4+ |
| Developer | Interflex Datensysteme GmbH | LEW Verteilnetz GmbH |
In-app purchases
Key
No in-app purchases
QS.on
No in-app purchases
