Everything the smart ring reads

The Mere Ring and app are in development. What follows is our current plan and may change before launch.

The ring reads you while you sleep and through your day. Each reading is set against your own normal, not an average of strangers. No scores, no red alerts: just what’s steady, what’s shifting and what might be worth a look, in plain English. Why Mere won’t give you a score.

Your normal first

For your first 14 nights, the ring simply learns you. After that, every night is read against your own normal, over the last week, month and season. One busy day won’t move the picture. A change that lasts will. Why your normal is yours.

Your pulse

Every night the ring reads the shape of each beat: its rise, peak, notch and echo. Its green, red and infrared light sensors sample your pulse up to 250 times a second, fine enough to trace each part of the beat. See a real pulse, beat by beat. How Mere reads the pulse wave.

• Sleeping heart rate, and your lowest heart rate of the night.
• Daytime resting heart rate, from your quieter moments.
• Heart rate variability (HRV), the small shifts in timing from one beat to the next.
• Pulse shape, against your own usual.

When something drifts, Mere tells you quietly, in words: “Your sleeping heart rate ran higher than usual last night.”

Sleep

• How long you slept, how long it took to fall asleep and how often you woke.
• Light, deep and REM sleep, estimated from movement and pulse.
• Blood oxygen while you sleep, from red and infrared light.
• Your rhythm: when you fall asleep and wake, night to night.

Sleep stages from a ring are estimates, not a sleep study. Blood oxygen from light is a wellness estimate, not a medical oximeter reading.

Stress and recovery

Through the day, the ring follows your HRV and your movement, two of the clearest signs of how keyed up or settled your body is. Mere shows when you ran hot and when you recovered, in words rather than a score.

The 30-second ECG sensor

The raised plate across the outside of the ring is a single-lead ECG electrode. Resting a fingertip of your other hand on it for 30 seconds lets the ring record the small electrical signal of your heartbeat, 500 times a second. We’ll explain how the Mere app uses it before launch.

Mere does not analyze heart rhythm. It won’t tell you whether a rhythm looks normal, and it doesn’t detect or monitor any condition. If something feels wrong, call your doctor. Don’t wait for a reading.

Your day

Steps, active minutes and an estimate of calories burned, so you can see how the day’s movement shows up in your night.

Your circle

Invite family members 18 and over. Each person chooses exactly what they share, starting from nothing, and every card shows when it last updated. A circle is a way to stay close, not a way to call for help. In an emergency, call 911.

What Mere doesn’t do

• It doesn’t analyze heart rhythm or read an ECG for any condition.
• It doesn’t measure blood pressure or blood sugar.
• It doesn’t estimate blood alcohol.
• It doesn’t check your breathing during sleep for problems.
• It isn’t birth control and doesn’t predict fertility.
• It doesn’t diagnose, treat, cure or prevent any disease.

Accuracy and limits

• Light-based readings can be thrown off by movement, a loose fit, cold hands or nail polish. That’s one reason Mere reads you at night, when your hand is still.
• Blood oxygen measured with light can be less accurate on darker skin (Sjoding et al., 2020).
• One night proves little. A change that lasts is worth a look.
• Some things shouldn’t wait for any reading: chest pain, fainting, trouble breathing, or a racing heart that won’t settle. Call 911 or your doctor.

The ring notices. Your doctor decides.