Comparison

Key vs Symphonie Connect

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Smartphone as mobile ID
  • Convenient door opening
  • Secure credential transfer
  • iPhone integration
  • Requires Interflex software
Read full description

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.

About

Symphonie Connect

Read full description

Symphonie Connect vous permet de bénéficier de toute la téléphonie d’entreprise en un seul service, où que vous soyez. L'application prend entièrement en charge la technologie PUSH, ce qui permet à votre appareil d'être inactif lorsqu'il n'est pas utilisé et économiser la vie de la batterie. Lorsque vous recevez un appel entrant sur votre poste de travail, votre appareil se "réveille" et vous avertit comme s'il s'agissait d'un appel GSM normal. Les avantages de Symphonie Connect incluent: - La réception et l’émission d’appels sur votre smartphone depuis votre extension de bureau - Organisez vos contacts favoris pour ne pas perdre de temps - Vous avez la liberté de vous déplacer selon les exigences de votre entreprise sans stress supplémentaire, car votre téléphone de bureau vous accompagne

Screenshots

Key4 screens
Symphonie Connect4 screens

Verdict

The call

The clearest difference is iOS requirement: Symphonie Connect at 15.0 against Key's 17.0. On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

Scorecard1 real difference · 7 level
Key versus Symphonie Connect: the parameters behind the verdict, then further details
ParameterKeySymphonie Connect
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 4 monthsEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size18 MB93 MB
Age rating4+4+
DeveloperInterflex Datensysteme GmbHStella Telecom

In-app purchases

None

Key

No in-app purchases

None

Symphonie Connect

No in-app purchases

Questions

Is Key free?
Key is free to download, with no in-app purchases.
Is Symphonie Connect free?
Symphonie Connect is free to download, with no in-app purchases.
Do Key or Symphonie Connect have ads?
Neither Key nor Symphonie Connect shows ads.
Which is updated more often, Key or Symphonie Connect?
Key ships an update every 4 months, and Symphonie Connect every 4 months. Most recently, Key was updated on November 2, 2026 and Symphonie Connect on November 6, 2026.

Other comparisons