Stackeddd tracks peptide and TRT protocols: every injection, site rotation, vial math, and a real PK chart showing blood levels rise and fall between doses. The AI coach reads your own labs, protocols, and logs - and is built to say "I don't know" rather than guess, tested against ~60 adversarial scenarios before every release. No account, no cloud, no analytics. Your data stays on your phone. Everything that keeps you safe is free; the coach is the paid part.