This article made a comparison between Owlet and BabyO2 S2.

Baby oxygen monitor now is thought to be a useful bedtime helper that brings peace of mind to new parents or caretakers. The innovative baby monitor continuously tracks oxygen levels and heart rates and sends alarms when abnormalities are detected. The responsibility of knowing whether your baby is okay when the lights go out always makes parents anxious and sleep not well because they have to take up to check the baby’s breath many times. Then the baby breath monitor with alarms actually eases their worried minds since once there is amiss, parents will receive alarms and can make an instant response.

So is there any trustable baby oxygen monitor brand in the market? Now the Owlet Smart Sock 3 and Wellue BabyO2 S2 are chosen by many new moms. We are going to compare these two brands from some aspects as follows.

five star rating illustration5 star

  • Continuous body movement, pulse rate and oxygen tracking
  • Real-time data on the monitor device, base station and phone APP, can monitor without phone
  • Notifications from alarm base station and phone APP
  • Mobile sleep reports
  • Built-in memory to save recordings
  • No Wi-Fi setting requirement
  • Safe, soft and non-slip wraps
four-half-star-rating-illustration4.5 out of 5

  • Heart rate and oxygen tracking
  • Real-time data on the phone
  • Notifications from the base station
  • Mobile sleep circle analysis
  • Wifi requirement
  • No backup memory
  • Wearable socks

#1 What’s in the Box

 BabyO2 S2:

  • Wellue BabyO2™ S2 baby oxygen monitor foot: main device + Wraps + oximetry sensor cable
  • Base station
  • Stitched soft wraps in different sizes (0-3 years old)
  • Split wraps in different sizes (0-3 years old)
  • Pulse oximetry sensor cable
  • Personalized sticker
  • User guide in 5 languages
  • Charging base station for the base station
  • Type-C charging cable for the station
  • Data/Charging cable for BabyO2 S2 main device
  • Quick guide for split wraps
  • 1-year warranty
Owlet smart sock package
Owlet Smart Sock 3:

  • 3 Owlet socks (sizes 0–18 mos.)
  • Sensor
  • Base station
  • Charging cords
  • Setup instructions
  • Quick reference guide
  • Warranty

#2 Pricing and Guarantees

Common pros:

  • One-time purchase
  • No contracts; no monthly subscription or long-term contract
  • Peace of Mind guarantee


Compared with the Owlet brand, the BabyO2 S2 baby breathing monitor is more economical.

#3 Tech and Equipment

  BabyO2 S2 Owlet Smart Sock 3
Bluetooth Connection Bluetooth connection between the monitor device, base station, APP Wi-Fi connection between the sock and APP, Bluetooth connection between the sock and the base station
Be monitored in 2 different houses A Bluetooth range of up to 10 feet A Bluetooth range of up to 100 feet
Battery life 16 hours for the monitor device, 7 days for the base station 16 hours for the sock
Backup memory/ Built-in memory Yes, the monitor main device can save recordings automatically (4 sessions, up to 10 hours for each) and can be synchronized to an APP after being connected with the phone. No, only use the phone to record data
BabyO2 S2 Pros:

  •  The medical-grade accurate oximetry sensor
  •  Real-time data on the 3 screens: main device, base station, phone APP dashboard
  •  Review the history data and oximetry analysis on the APP dashboard
  •  Receive alarms from the base station & APP
  •  Monitor and base station can be used independently without the phone

Owlet Pros:

  • See real-time data and sleep report only on the phone
  • Receive alarms from the base station

Owlet Cons:

  • No backup memory
  • No monitor screen
  • Must use the phone to see real-time data and save history recordings
  • Must be used in the Wi-Fi environment
As for the Bluetooth connection and built-in memory, BabyO2 S2 is better than Owlet. It is not convenient to use the Owlet sock to save recordings because a Wi-Fi connection is needed if connecting the Owlet APP to view real-time readings and sleep history, which means you have to use it in a Wi-Fi environment. And even worse the Owlet sock does not have backup memory, so you have to record the data with your phone connected with the sock via Wi-Fi.

The BabyO2 S2 is more friendly to travel. Its base station is light in weight and small in size, so easy to carry. With long battery life, you do not have to worry about its charging problem. Otherwise, its built-in memory supports saving recordings without a phone, so it won’t interfere with your daily phone use. But if you want to get the oximetry analysis for your little one, you have to connect the main device with your phone and then you can review the history data and analysis.

#4 Features and usability

BabyO2 S2 Owlet Smart Sock 3
Notifications/Reminders from the base station Oxygen reminder, pulse rate reminder, no value reminder, moving reminder, the offline reminder Live heart rate, oxygen level, wellness notifications, and room temperature sensors
Adjustable audio alarms Yes, you can customize the reminder: oxygen levels threshold, pulse rate threshold, reminder delay time No, the Owlet Smart Sock’s preset levels cannot be changed.
Monitor screen: Real-time readings 3 screens: monitor device, base station, APP Only APP
Sleep history report Review on APP and PC software Review on APP

BabyO2 S2 pros:

  • Real-time monitor screen
  • Adjustable parameters’ thresholds and audio alarms

BabyO2 S2 cons:

  • No temperature sensor

Owlet Smart Sock pros:

  • Have room temperature sensor

Owlet Smart Sock cons:

  • No monitor screen
  • Absolute preset oxygen norms

#5 APP Comparisons

BabyO2 S2 pros:

  • Free to use
  • Detail sleep reports knowing your baby’s average oxygen and the time of lower than 90%

BabyO2 S2 cons:

  • Don’t support multiple users
  • Once you leave the dashboard, you cannot receive alarms from your phone if you don’t use the base station.
Babyo2 s2 app recordings
Babyo2 s2 app trends dashboard
Babyo2 s2 remeinder settings
Owlet Smart Sock pros:

  • No monthly fee is required to access the Owlet app.
  • The same Owlet app account can be logged into on multiple devices.

Owlet Smart Sock cons:

  • Must connect Wi-Fi
  •  Phone notifications are dependent on your device’s sound settings. If you have the sound off on your phone, you will not get sound notifications from the Owlet app, only vibrations.


After comparing the BabyO2 S2 baby oxygen monitor and Owlet Smart Sock3 as above, you can find the BabyO2 S2 is more economical than Owlet. Both the baby monitors are used to track your loved little one’s vital signs of oxygen levels and pulse rates and to send audible notifications to parents so as to tell them when babies need attention. The BabyO2 S2 is more convenient to carry outside and to read real-time data because of its Bluetooth connection, built-in memory and long battery life, while the Owlet doesn’t have a monitor screen and relies on your phone use too much. But on the other hand, the APP of BabyO2 S2 is not better than Owlet APP. However, it won’t affect its main purpose to review historical data and oximetry analysis. Thus, by and large, BabyO2 S2 is more cost-effective than Owlet Smart Sock.

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