Bellabeat Ivy: Sleep Tracking Data and Specifications

Data Sources and Methodology

This review compiles data from Bellabeat's published Ivy product information (bellabeat.com, verified April 6, 2026). No first-person testing was conducted.

Important caveat upfront: no peer-reviewed PSG validation has been published specifically for the Bellabeat Ivy as of April 2026. Bellabeat positions Ivy as a women's-wellness device with menstrual cycle integration as a primary feature; CircaTest cannot independently verify the cycle prediction accuracy claims without peer-reviewed evidence.

CircaTest's record covers the Ivy line generally. Both the original Ivy and the newer Ivy+ are current Bellabeat products. Verify exact model availability against bellabeat.com before purchasing.

Sensor Suite

Per Bellabeat's published product information, the Ivy contains:

Optical heart rate sensor (PPG): for heart rate, HRV, and respiratory rate.
Accelerometer: for actigraphy and step tracking.
Body temperature sensor: Bellabeat describes the newer Ivy+ as adding sophisticated temperature tracking for fertility purposes. The original Ivy has more limited temperature sensing.

The Ivy does not include SpO2, ECG, EDA, altimeter, or GPS sensors. Bellabeat positions Ivy as a wellness bracelet rather than a fitness watch; its sensor set is intentionally minimal compared to Garmin or Apple Watch.

Sleep Tracking Features

According to Bellabeat's product documentation, the Ivy detects light, deep, and REM sleep and naps. The data is exposed in the Bellabeat app without an additional subscription. Bellabeat does not appear to expose a discrete numeric sleep score in the same sense as Oura or Whoop. There is no smart alarm feature documented.

CircaTest cannot independently verify the per-stage accuracy claims because no peer-reviewed PSG validation specific to this model has been published.

Health Features

HRV: tracked via the optical heart rate sensor.
Resting heart rate: tracked.
Respiratory rate: tracked.
Body temperature: tracked (more sophisticated on the Ivy+ variant).
Menstrual cycle: positioned as the primary use case. Bellabeat correlates biometric and lifestyle data to the four phases of the cycle. CircaTest does not independently verify the cycle prediction accuracy.
Stress tracking: included.
Wellness Score / Readiness: included.
Blood oxygen, strain, recovery, sleep apnea detection: not included.

The Bellabeat Ivy is not FDA-cleared.

Hardware

Weight: approximately 0.35 ounces (about 10 grams) per Bellabeat published product information.
Battery: up to 8 days. Charges in approximately 90 minutes.
Water resistance: specific water resistance rating not extracted from a verified Bellabeat source.
Material: high-quality silicone with stainless steel parts.
Display: none. The Ivy is intentionally screen-free; metrics are viewed exclusively in the Bellabeat app.

Subscription and Cost

Bellabeat Ivy retail pricing varies; CircaTest does not have a single verified US consumer price from a primary Bellabeat source. Verify against bellabeat.com before relying on the figure. Bellabeat offers an optional Premium subscription for additional coaching content; the device functions without it. Some current product configurations include 6 months of free personalized coaching.

Compatibility

The Ivy pairs with both iOS and Android via the Bellabeat app and integrates with Apple Health and Google Fit. Strava is not supported.

Who It Is For (Based on the Data)

Users who specifically want a screen-free, jewelry-style wellness bracelet
Users for whom menstrual cycle correlation and women's wellness framing is the primary use case
Users who prefer a lightweight (about 10 g) bracelet with multi-day battery life
Users who do not need SpO2, GPS, or sleep apnea screening

The device's data profile is less aligned with users who need independent peer-reviewed PSG validation, users who want SpO2 monitoring, users who want GPS or strain tracking, or users who require an FDA-cleared cycle or sleep product.