This article presents results from a human-centred approach study to designing a mobile app TALAÐU!, which aims at assisting learners of Icelandic as a second language (L2) with spoken language practice. The main goal of the app would be to encourage learners to have real-life conversations with Icelandic speakers by accomplishing conversational missions. In the first stage of development, a qualitative deep-method needs study in the form of interviews was conducted with 19 migrants from 14 different countries, who permanently live in Iceland. Results indicated that learners have five core needs for practising spoken language: connection, confidence, clarity, growth, and convenience. Based on different learning styles and confidence in speaking rather than language ability, three main learner profiles were indicated: 'diving in', 'learning with caution' and 'dipping a toe'. Both the learners' needs and the profiles would drive the design of the learning app to personalise and maximise the learner experience with practising spoken L2. This human-centred study approach suggests an innovative strategy in designing a learning app for practising L2 in a specific language and culture environment. [For the complete volume, "CALL and Professionalisation: Short Papers from EUROCALL 2021 (29th, Online, August 26-27, 2021)," see ED616972.]