iOS · App Store · 2026

ColdKeeper

The cold-therapy coach that lives in your pocket. Pick a session, tap the giant START button, and ColdKeeper handles the timing, the haptics, the streak and the history — so all you have to do is breathe and stay in.

01 / Who it's for

ColdKeeper is built for people who take cold seriously enough to keep doing it past day three. Wim Hof breathers, contrast-therapy athletes, open-water swimmers, biohackers raised on Huberman and Rogan, and anyone who wants their cold-shower habit to stick. Beginners welcome — the Beginner Ramp is designed for the first four weeks, no ego, no shame.

02 / What's included

Four session types

Ice bath, cold shower, open-water swim, contrast therapy — each with optional water temperature logging and the right defaults so you're not setting up a session in 4 °C water.

Guided protocols

Beginner Ramp— 30 s → 60 s → 2 min over four weeks. The proven on-ramp.
Wim Hof — guided breath rounds plus immersion, timed for you. No more YouTube juggling.
Contrast Therapy — automatic hot/cold alternation, athlete-style recovery.
Custom (Pro) — design your own intervals.

Built for hands you can’t feel

Giant tap targets. Strong haptics. Audio cues that get through a hood and closed eyes. Screen stays awake. No menus, no fiddling, no shrinkage-induced typos when you just want to stop the timer.

Deep history & streaks

Every session logged with date, type, duration, optional temperature. See your streak, total time under the cold, longest plunge, and weekly trend at a glance. The free tier keeps the last 7 days; Pro keeps everything, forever.

03 / ColdKeeper Pro

One-time purchase: $7.99 / 7,99 €. No subscription. No renewal. All future updates included.

Unlimited history
All advanced protocols + custom protocol builder
Apple Healthintegration (sessions logged as “Cold Water Immersion” workouts)
iCloud sync across all your Apple devices via your private CloudKit container
Home Screen widgets (streak + last session)
Detailed weekly and monthly stats

The free tier is fully functional. Pro is for people who plunge often and want their data to compound.

04 / Privacy first, by construction

ColdKeeper does not collect data. No analytics, no telemetry, no crash-reporting SDKs, no ads, no accounts. Everything you do stays on your iPhone, or — if you enable Pro and iCloud — in your own private iCloud container, which the developer cannot read.

Read the full privacy policy.

05 / Designed for iOS, end to end

SwiftUI, built natively for iOS 17+
SwiftData persistence with CloudKit sync (Pro)
StoreKit 2 for the in-app purchase
Core Haptics + AVFoundation for transitions
HealthKit (workouts, opt-in, Pro)
Localized in English and French
Light and dark interfaces, full Dynamic Type support

06 / Safety

Cold immersion can be dangerous. ColdKeeper is a wellness and lifestyle app, not a medical device. Consult a physician before starting, especially if you have cardiovascular conditions. Never plunge in open water alone. The app does not diagnose, treat, or prevent any condition.