Morning light falling in stripes across a white bed where someone is still asleep
Pellum One

Sleep, measured.

A 2.6 mm titanium ring that reads your night.

Shop — $249

See how you slept. Plan the day around it.

Pellum reads pulse, skin temperature and movement overnight, and has one sleep score ready when you wake.

How It Works Find Your Size
A woman asleep under a white duvet Sleep Stages

See where your deep sleep went

A runner silhouetted against a low orange sun Resting Heart Rate

Watch your heart settle after a run

A woman holding the ladder of a cold outdoor pool in snow Skin Temperature

Notice small shifts before you feel them

A woman stretching her arms overhead in bed Recovery

Know when to train and when to rest

A man standing by a window with his hands pressed together Breathing Rate

Slow your breathing, then check it

A bedside lamp lit beside a notebook on the bed Wind-Down

Build an evening that ends in sleep

Seven days per charge.
Full again in 80 minutes1

Sleep stages, resting heart rate, HRV, skin temperature and breathing rate: five readings and one morning score, all in the Pellum app.

Free app for iOS and Android. No subscription.

See the App

Questions we hear most

Sizing Q.
Between two sizes? Order the free kit first. Wear a plastic sizer on your index finger for 24 hours, one night included, then choose the one that stayed put.
Kit ships free in 2 days
Battery Q.
How long does a charge last? Seven days with sleep tracking and daytime heart rate on. The dock takes it from empty to full in about 80 minutes.
Charging dock in the box
Returns Q.
What if it doesn't suit me? Send it back within 30 days in any condition. We pay return shipping from anywhere in the US.
30 days, free return label

New in the App

Meet Wind-Down

A 30-minute evening plan built from your last 14 nights: when to dim the lights, when to put the phone away, and the bedtime that gave you the most deep sleep.*

See Wind-Down
A woman in bed looking at her phone beside a lit bedside lamp

From the Journal

A hand wearing two plain silver rings resting on a knee Featured Guide

How Pellum Estimates Sleep Stages From Your Finger

Read the Guide

Sizing: why we fit Pellum to your index finger first, and when to choose the middle finger instead

Charging: what the amber light on the dock means, and how to keep the battery healthy

Travel: how Pellum handles a nine-hour time change

1 Battery life measured in our San Francisco lab on Pellum One with sleep tracking and daytime heart rate on. Charge time measured from empty with the included dock.

* Pellum is a wellness product. It does not diagnose, treat, cure or prevent any disease or medical condition, and its readings and suggestions are not medical advice. Do not use them to replace a clinical assessment or to change a treatment. If you have a health concern, talk to your doctor or another qualified professional. If you think you are having a medical emergency, call 911.