This talk will present the OSM Swiss Style project and the new OSM Swiss Base Map, which was developed by University of Applied Sciences OST, in cooperation with ETH Zurich, Sourcepole AG and the Swiss OpenStreetMap Association. The goal is to create a base map for thematic maps that blends Swiss cartographic design principles such as clarity and readability with modern technologies like vector tiles and unique worldwide datasets such as OpenStreetMap (OSM) data and Terrain 3D tiles. The map style pays particular attention to public transport. It uses MapLibre GL JS, PMTiles, Tilemaker with Lua scripts and an extended Shortbread schema. Graphical assets include custom-made icons, icons from the OSM project, and the Roboto font. Innovations include geographical name and points-of-interest (POI) prioritization with QRank, which will be discussed alongside the challenges experienced so far.