HappiTech App

UX Design / Client project

We helped our client with developing an application that helps elderly with hearth rhythm problems to measure if they currently suffer from Atrial Fibrillation or not. We created a guiding flow in a way that elderly can finish their measurement in an easy way, or recover from errors easily.

My contributions: UI Design, Flow creation, Structural thinking, in situation user testing & User Research


HappiTech is a company which creates algorithms that can indicate heart arrhythmia for heart patients at the OLVG Hospital, of which elderly are the main focus group. They implement this algorithm in a smartphone, for which they use the camera and flash.


Elderly do not understand the instructions clearly and make a lot of errors during the measurement process. Due to these errors, measurement often fails or the results are not accurate enough.


Improve the whole UX before and during measurement in such a way that the quality of the measurement improves.


We analysed the application by defining its current wire flow and conducting user tests with the target group in order to already find some pain points within the app.

User Testing with the initial application
Next to this we did an elaborate research on the design principles for elderly based on psychological & behavioral grounds, and we conducated an comparative & competitive analysis with the existing apps.

Structural thinking and the deliverables

We clustered the results of these different research methods and defined the main problems and created based on our findings personas and a customer journey, which gave us insights in the pain points of the user. Upon analysing the information we started ideating how we could solve for different problems that occured, with the elderly user in mind.

The main problem that needed to be solved was letting elderly be able to go through the instructions and measurement effortlesly and correctly, with as minimum information as possible, but in such a way that they can't do it wrong. This was troublesome since the technology was very sensitive.

Sketch of the instruction screens together with copywriting

We sketched & acted out different possibilities for our main focus points: giving consice but enough instructions, guiding people through the instructions and measurement steps, decreasing the possible amount of errors that can be made and deminishing the anxiety of doing something wrong, or what happens when something does go wrong.

The new application would contain step by step instructions throughout the whole instruction and measurement process. Different sources of feedback were used to this in order to sustain the ability for elderly to do it correctly. We did this through designing concise and timed feedback and designing a better flow of the application itself. The result would be an easily understandable guided way of measuring your heart rhythm through means of an app and voice feedback.

app screen designs

For validation we tested our designs with the age target group in a prototype format, and on location with the actual heart patients, in order to make iterations that improve our flow, and concise and timed feedback. In the end, our client was elated with our results of the user tests, app design, and voice instructions, in which we handed over the data ready to implement.

Due to confidential information, not all content is shown