Owlet Sock vs Nanit Breathing Band — what's different in the UK?

What does each product actually measure?

Do not treat them as two brands of the same sock. The Owlet UK Dream Sock page (checked 10 September 2026) describes a pulse oximeter on the foot: live pulse rate and oxygen saturation, plus sleep trends in the Owlet Dream App, with a separate base station that keeps Health Notifications even if home Wi-Fi drops (Bluetooth to the base; UK copy says keep the base within 9 metres).

The Nanit UK Breathing Band page describes a sensor-free cotton band. A custom pattern on the fabric is what the Nanit Pro camera (sold separately) watches. Nanit's US product FAQ says Breathing Wear contains no electronics, wires or sensors; the camera's software looks at movement of that pattern and can alert if no breathing motion is detected. That is chest-wall motion in the camera picture, not a pulse-oximeter number.

The Lullaby Trust groups pulse-oximetry / heart-rate gadgets as 'other types' of monitor and does not use them on its CONI programme. It also says there is no research evidence that monitors prevent SIDS. MayTally does not rank either product as the better medical device.

What are the official weight, age and sleeping-bag limits?

Nanit also sells Breathing Wear sleeping bags with the pattern knitted in (UK size chart starts at 3–6 months). That is a different SKU from the band you put over an ordinary sleeping bag. If the pattern is buried under a thick, unpatterned bag, the camera has nothing to watch — use the band over the bag as the UK band page describes, or use Nanit's own patterned sleeping bag.

Does Nanit need a subscription, and does Owlet?

Owlet's UK product page states no subscription fee for the Dream App features it lists, including Health Notifications once you enable that toggle.

Nanit's memberships FAQ (nanit.com, checked 10 September 2026) states an Insights plan is not required to use the smart monitor. The core list there includes live video, sound and motion alerts, and Breathing Motion Monitoring, plus two users. Insights is the paid layer for video history, longer sleep analysis and extra caregiver seats. US list prices on that page (3 months free then auto-renew; Memories about $10/month or $120/year; Milestones about $25/month or $300/year, billed annually) are dollar figures. The UK band page tells you to email [email protected] for subscription questions rather than publishing a sterling table.

Practical UK difference: Owlet's sock works with its own base if Bluetooth holds; Nanit's band does nothing without a working Pro camera, a view of the chest pattern, and the household Wi-Fi the Nanit app uses for live view.

How do they sit with Lullaby Trust monitor advice?

The Lullaby Trust monitors page and November 2024 factsheet say:

• No research evidence that monitors prevent SIDS.
• Stay in the same room for the first six months; a monitor cannot replace that.
• Follow the manufacturer's instructions; keep the control unit out of reach.
• Movement pads can pick up adult or vehicle movement and give false reassurance.
• Pulse-oximetry / heart-rate gadgets are not part of CONI; the charity found extra numbers can add anxiety.

If any alarm sounds — sock red, Nanit breathing-motion alert, or a camera cry alert — use the charity's sequence: check the baby, 999 if no response, NHS 111 if they respond but you are worried.

Which one should I pick?

Pick by what you want a number or a picture to show, not by which advert feels calmer.

• Owlet if you specifically want a foot pulse-oximeter with published 50 / 220 bpm and 80% SpO2 presets, a base station that still sounds when Wi-Fi drops, and a single UK box price with no app fee on the brand's page.
• Nanit band if you already have (or are buying) a Nanit Pro camera, want a washable cotton layer over pyjamas or a sleeping bag, and are content with camera-pattern motion rather than a pulse-oximeter. Budget the camera and check whether you want paid Insights for history.
• Neither as a SIDS plan. The Lullaby Trust will not pick a winner, and MayTally will not call one safer than the other.

In shortSock = pulse and oxygen on the foot. Band = patterned chest motion on a camera. Different kg limits, different boxes, different fees. Same first action if anything alarms: check the baby.