Key vs Ohm
Price, ratings, monetisation and update history for both apps, side by side β 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.
Ohm
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In a world driven by technology, precision is paramount. Whether you're an engineer, hobbyist, or simply someone curious about the dynamics of electrical wire coils, Ohm-Y is your comprehensive guide. This app has been meticulously designed to provide instant, accurate calculations related to resistance, wattage, amperage, and the heat coefficient of any electrical wire coil. Join us on a deep dive into what makes Ohm-Y the must-have app for anyone dealing with electrical circuits. Precision Calculations: Using advanced algorithms and a rich database of material properties, Ohm-Y ensures that you get the most accurate readings on the parameters of your coil. Say goodbye to the guesswork and hello to precision. Intuitive User Interface: We believe that powerful tools should be easy to use. Our minimalist design approach ensures that even if you're not familiar with electrical terminologies, you'll find the app approachable and straightforward. Heat Coefficient Insights: The heart of any coil is its ability to manage heat. Our app doesnβt just give you numbers; it offers insights. With Ohm-Y, you can predict potential overheating scenarios and take proactive measures. Diverse Materials Database: From copper to titanium, our extensive material database covers a broad spectrum. Whether you're working on a DIY project or a large-scale industrial application, Ohm-Y has got you covered.
Screenshots
Verdict
The clearest difference is price: Key at Free against Ohm's $2.99. Ohm's advantage is update cadence (every 3 weeks vs every 4 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Key is free to download; Ohm costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Key ships an update every 4 months, Ohm every 3 weeks. Both last shipped on October 2, 2026.
| Parameter | Key | Ohm |
|---|---|---|
| Price | Free β better | $2.99 |
| Positive reviews | 100.0% of reviews | β |
| Update frequency | Every 4 months | Every 3 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | β |
| Devices | iPhone, iPod, Apple Watch β better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details β not scored | ||
| Size | 18 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Interflex Datensysteme GmbH | Eric Weil |
In-app purchases
Key
No in-app purchases
Ohm
No in-app purchases









