Cold Plunge Timer: Rimewell

Rimewell is a cold plunge timer and sauna tracker for people who take the cold seriously. Start an ice bath, a cold shower or a sauna session, put the phone down, and Rimewell rings at the exact second, even with the screen locked or the app closed.

TIMERS FOR EVERY SESSION
Choose ice bath, cold shower or sauna. Every phase change comes with a sound and a vibration, minute marks in the cold (every 30 or 60 seconds, or off) tell you where you are without looking, and a long final tone keeps going until you tap Stop. The sauna timer and the ice bath timer run on the alarm clock of your phone, so they stay exact in battery saving mode and after a restart.

CALM BREATHING BEFORE YOU GO IN
A pacer circle with gentle vibration guides slow breathing on dry land before you get in: the physiological sigh or calm 4-6 breathing. Rimewell never asks you to hold your breath or to breathe fast. During the first 30 seconds of every cold phase, a cold shock coach on the screen helps you breathe out long and slow.

A LOG THAT KEEPS EVERYTHING
Every session is saved with its real duration, the water or sauna temperature in °C or °F, how it felt from Brutal to Euphoric, and a note. Edit or delete any entry. The journal shows a month calendar (blue for cold, orange for heat), weekly totals and your records: longest cold, coldest water, longest streak. Rimewell is your cold plunge tracker and sauna tracker in one, and no session is ever deleted.

STREAKS, WEEKLY GOALS AND A PLAN THAT GROWS WITH YOU
Rimewell counts your days in a row with cold and tracks a weekly goal for cold minutes and sauna minutes. The default of 11 cold minutes and 57 sauna minutes per week comes from a 2021 study of winter swimmers (Søberg et al., Cell Reports Medicine); change it to whatever suits you. The adaptation plan suggests your next target from your own sessions: 15 seconds more when your last plunge felt okay or better, a little less when it felt brutal.

30 DAY COLD CHALLENGE
Thirty steps from 0:30 to 3:00, at most one step per day, and a brutal session repeats the step. Share your streak card with a grid of 30 days, your streak, your cold minutes and your coldest water.

DAILY REMINDER
Pick a time and Rimewell reminds you once a day. On days you already had a session, it stays quiet.

WHAT IS FREE
The ice bath, cold shower and sauna timer, the alarm with the screen locked, the safety page, two calm breathing patterns and the cold shock coach are free, and your sessions are never deleted. Try the challenge for three stages, your plan for your first sessions and the journal for the last 7 days.

RIMEWELL PRO
Pro is where the practice grows: the full 30 day challenge, your personal plan after every session, your whole history with records and a 12 week trend, how you felt by water temperature, contrast rounds (sauna, cold and rest, up to 8 rounds, three presets), CSV export, share cards without watermark, more breathing rhythms (box 4-4-4-4, 4-7-8, coherent 5.5), a voice coach and two more final tones.
Subscription: monthly or yearly, with a 3-day free trial on the yearly plan. Cancel any time in Google Play.

SAFETY FIRST
Rimewell is a timer and cold plunge tracker. It is not medical advice and not a medical device. Never go into cold water alone, and stay within reach of the edge. Get out at once if you notice warning signs such as uncontrolled shivering, numb hands or feet, confusion, dizziness, chest pain or trouble breathing. Warm up slowly afterwards, because your body can keep cooling for a while (afterdrop). If you have a heart or circulatory condition or are pregnant, talk to a doctor before cold plunges or sauna. No alcohol before cold water or sauna.

PRIVATE BY DESIGN
No account, no ads, no tracking. Your sessions stay on your phone. Questions or ideas: [email protected]

Rimewell: a cold plunge timer, ice bath timer and sauna tracker that rings on time and keeps every session.