• Redesign of the most widely used banking app in Germany
  • 4 Mio users
  • Complete redesign of the navigation and core features
  • User tests in every cycle of concept/design iteration
  •  Platforms: iOS and Android

  • Ideation
  • Expert review
  • Concepts
  • Product design
  • Evaluation of the user interviews
  • Creation of lo-fi, hi-fi wireframes
  • Prototyping
  • Visual Design


Legacy Design

In 2016, decision was made to modernize the app and adapt it more to the users' needs. The essential functions should be more easily accessible. Also, the outdated design should be modernized.
The big challenge in this project was to reconcile the marketing goals and the user needs. After all, the app is used by the Sparkasse banks for advertising campaigns. These hinder the users from carrying out their tasks.

Design-wise, the primary warning red –  the main corporate identity color is difficult to work with: 
  • Red means error in the UI context,
  • It widely used to signal negative balance

The app should be modernized carefully. As our first user interviews showed, the app's appearance is generally perceived as matching the brand:

During the user interviews, we found out the most important triggers to start the app:

  • Has something happened since the last time?
  • Waiting for the salary to arrive.
  • Waiting for another payment.
  • Information about an expected direct debit that has taken place.
  • Information about an unexpected debit.

In-App-Analytics essentially reflected the findings from the in-depth interviews; the average session duration is 30 seconds and is limited to the account and the transaction list in most cases (92%).


The main innovation in the app was an intro screen. It had several obvious and unobtrusive advantages. It was tidier and moved the most important functions to the front. (Ex: only a few subjects knew about the card lock function in the app).


The navigation between the account overview and the accounts has been fundamentally reworked. In the old version, one navigated from the accounts list to the lower level to the account hierarchically.

In the new app, switching between accounts is done by swiping left or right. Back navigation was no longer necessary.

This solution has another advantage; the main menu at the top left is now also accessible from the transaction lists.

The new navigation was intuitively understood by the test subjects from the existing customer base and was perceived extremely positively and as a clear advance over the old version.


The sales list has been polished, especially visually. Because most users access the app at least twice a week, they are only interested in the transactions of 2-3 days – about 6-8 list items.

So there was no need to have so many transactions visible on the screen. We increased the spacing between the items and generally enlarged the amount of white space. Since the savings bank accounts are kept in euro currency, the superfluous currency information on turnovers has disappeared. The cent amounts, which are less relevant for users, have been superscripted. The often cryptic usage text can now only be found under details. These measures make the content easier to read and easier to scan.


The transfer form has also been revised. The sender account no longer has to be painstakingly typed in but is selected by a swipe gesture. According to analytics data, every eighth transfer goes to a different dedicated account. In addition to the simplified account selection, the predefined amounts are offered here for quick selection.

Compared to the legacy app, the prototype of the new app was rated by a majority of the test persons as clearer and visually more appealing with a more modern design.