VLXCORE.

A clock for sauna and cold water. Pick a plan or build one: heat, cold, rest, and how many rounds. You start it yourself. The app counts each phase down, keeps the screen on, and prompts by vibration only. Pause, skip a phase, add a minute, or end early — what you did is kept. Afterwards: heat and cold minutes, rounds, longest cold, and how it felt. Past workouts, weekly totals, a weekly goal. Everything stays on this iPhone. No sign-up, no cloud. Back up to a file, restore from one, or erase everything. Read the warnings on the first screen. Sauna and cold water are hard on the body; speak to a doctor before you begin. Nothing here is a substitute for advice from a doctor.