NightOwl Companion

23.3K reviews
Content rating
Everyone
100K+
Downloads
Content rating
Everyone
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About this app

This app allows you to interact with the NightOwl sensor that measures signals from your index finger with a small light sensor to check if you have sleep-related breathing disorders.

You can set up the test in a few minutes using the in-app instructional videos. Wear the sensor for the prescribed number of nights to complete the test.

Disclaimer: This app may provide information from external medical devices. Before making any medical decisions based on this information, read the device instructions carefully and speak with your healthcare provider.
The NightOwl Companion app allows you to interact with the NightOwl sensor.
Updated on
Aug 5, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Location, Personal info and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

23K reviews
Debra Sea
August 8, 2026
Useless. I'm supposed to do a two night sleep study. The first night it failed. I figured it was user error. The second night was successful. But it has absolutely refused to upload. I have a fast internet connection. It will not let me record another night until that one uploads. I'm waiting to hear back from the powers that be.
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Stephen Davidson
April 25, 2026
Does Not Work. Last night the app itself froze and it would not respond this morning. It would not stop recording so I closed the app and re-opened it. Once I did that I was able to stop recording. Then I get an error message stating that it didn't record because the sensor wasn't connected even though I followed the set up instructions perfectly. I've had 1 successful night out 5 recording data for this test and ive done the exact same thing every night for the test. So it's definitely not me.
4 people found this review helpful
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Amanda Fischer
June 12, 2026
❤️ this option for a sleep study! I believe this is more accurate due to home environment. Completing a sleep study at an office is more like a stay at a hotel. Especially, if you have pets that wake you up in the middle of your sleep. Being able to do this at home is wonderful! Only issue I have is how we use a piece medical tape on the device to be strapped onto your finger. It should be more like a pulse oximeter probe where it is strapped on vs the big bulky box.
1 person found this review helpful
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What’s new

- Minor feature enhancements
- Performance improvements
- Bug fixes

Thank you for using NightOwl!