Thesium develops desktop software that ingests user-held artifacts such as broker exports, resumes, calendars, and documents to build inspectable models for single decisions. Products include Thesium Risk (portfolio regime scoring and exposure analysis, shipped), Thesium Career (fit analysis and growth projections, closed beta), Thesium Time (automation candidate identification, in design), and Thesium Research (cited claim graphs, in design). All computation runs locally on macOS with no server-side data copies or telemetry. Founded by William Souillard-Mandar.