Six calculators, each built from the data behind our field reports. Cold-plunge cost-per-session, sauna power bill, sleep debt, supplement-stack spend, HRV by age, daily protein. All client-side. No signup.
Each tool reflects what we wished we'd had when we were figuring this stack out for ourselves. The math runs in your browser; nothing is logged.
Plunge Cold Tub vs Ice Barrel vs DIY freezer vs stock tank — what each costs you per session over 1 to 10 years.
Monthly and yearly electricity cost for any sauna — infrared, traditional, blanket — at your kWh rate.
Pick the supplements in your stack — see monthly, yearly, and per-day cost at mid-range brand prices.
Seven nights in, weekly sleep debt out — plus what that debt is costing you cognitively.
Where your morning HRV lands vs your age group, in percentiles — plus what the number really means.
Daily protein target by body weight, goal, and activity — defaults from the Phillips meta-analyses.
One short email a week. The gear we're testing, the one piece of research worth your time, and what we'd actually buy this week. No upsells.
Join 12,400 readers · Unsubscribe anytime.