This paper presents the reasoning behind and the results from usability testing of the user- and administrative side of FIPIC (Flexible Interactive Platform for Interviews with Children), a digital questionnaire tool for children. The user side was tested with 24 elementary school children between grades 1-6. They first chose which avatar and voice they preferred and then answered six questions using FIPIC while being timed on each question. The administrative side was tested with five researchers from different universities in Sweden using a scripted list of user tasks and the think-aloud method. The researchers would then answer some follow up questions after their test session. The results showed that the user side did not have any major issues that significantly affected the usability of FIPIC. The biggest issues were the non-clickable emoji’s under the slider function and having to scroll up and down. The solution is to make the emoji’s clickable and replace the drop down with a text field to avoid the scrolling. The results of the administrative side showed that most of the usability issues were present in the newer functionalities such as question groups and group connections. Functionalities that are not present in other common questionnaire tools. The suggested improvement is to make the design more intuitive. For example, the create question group button should be placed at the top of the questions page instead of having to first click the create question button. This makes hierarchical sense because a group is needed in order to create a question.