WORKS WITH · SUPPORTED, PRO

Wellue O2Ring with CPAP data in Apnealytics

The Wellue O2Ring is the most popular oximeter among CPAP users for a simple reason: it is a ring, so it stays on all night. Apnealytics imports its CSV export and overlays SpO₂ and pulse on your CPAP night, then adds ODI₃, ODI₄ and T90 to the summary. Using the Wellue O2Ring with CPAP data is a Pro feature.

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A hand resting on a bed sheet at night wearing a silicone ring oximeter

O2Ring at a glance

Spec	Wellue O2Ring
Form	Soft silicone ring worn on the thumb or finger
Records	SpO₂, pulse rate, motion; some variants add body position
Sample interval	Every 1 s stored, exportable at 1 s or 4 s
Battery	Roughly 12–16 hours per charge
Memory	Several nights on the ring before sync
App	Wellue's ViHealth app for iPhone and Android; O2 Insight desktop software for Windows and Mac
Export	CSV (and PDF report) from the app or desktop software
Apnealytics status	Supported, Pro

Export the CSV

Open the Wellue app and sync the ring over Bluetooth so last night's session appears.
Open the session and choose Share or Export.
Pick CSV
The app offers a PDF report too; Apnealytics needs the CSV.
Save the file to Files on iPhone, to your downloads on Android, or share it straight to the Apnealytics app.
On a computer, the desktop software exports CSV from the session list in the same way.

The CSV contains a timestamp, SpO₂, pulse and a motion column, one row per sample. Apnealytics recognises the Wellue layout and maps the columns without asking.

Import into Apnealytics

On the phone: in the Apnealytics app, open the night and tap Add oximetry, then pick the CSV. Or share the CSV from the Wellue app to Apnealytics directly.
On the web: at my.apnealytics.com, drop the CSV onto Import or open the night and choose Add oximetry.
Apnealytics matches the session to the right night by timestamp and aligns it to your machine's clock. If the ring's clock is off, drag the offset control to line up the dips with the events.

Import a whole folder of CSVs at once to backfill past nights. Duplicate sessions are skipped.

What the overlay shows

The night view gains two traces above the airflow and event strip: SpO₂ in one colour, pulse in another. Desaturation markers show each drop of 3 percent or more, with 4 percent drops marked more strongly. Click any marker and the Pro waveform viewer zooms to that moment so you can see what your breathing was doing when your oxygen dropped. The night summary adds average and lowest SpO₂, average and highest pulse, ODI₃, ODI₄ and T90, and each is trended over 30 nights or any range.

ODI and T90, briefly

ODI₃ and ODI₄ count desaturations of 3 or 4 percent per hour. T90 is the time spent below 90 percent SpO₂. They describe what the oximeter saw, independent of what the machine counted as events. The two often agree and sometimes do not; the overlay exists to show you which. Neither is a diagnosis. See SpO₂ explained.

SpO2 and pulse overlay with ODI3, ODI4 and T90 tiles

Known quirks

Motion artefact. A ring on a hand that moves a lot records brief false dips. The Wellue export includes a motion column, and Apnealytics flags samples with high motion so you can discount them.
Clock drift. Sync the ring with the app before bed so its clock is fresh.
4-second export. If you export at 4 s intervals the overlay is slightly smoother and brief dips may be shortened. 1 s is better when offered.
SleepHQ comparison. SleepHQ supports only its own SleepHQ-branded O2 Ring. Apnealytics reads the standard Wellue CSV, so any O2Ring works.

Pro note

Oximetry import and overlays are part of Pro at $8.99 a month or $99.99 a year, per account, covering every family login. See pricing.

FAQ

Questions people ask

Help center →

Does the Wellue O2Ring work with Apnealytics?

Yes, on the Pro plan. Export a session as CSV from the Wellue app or desktop software, import it on the web or in the iPhone or Android app, and SpO₂ and pulse are overlaid on that night's CPAP data with ODI₃, ODI₄ and T90 added to the summary.

Do I need the SleepHQ-branded O2 Ring?

No. Apnealytics reads the standard Wellue CSV export, so any O2Ring, including older and newer variants, imports. SleepHQ supports only its own branded ring; that limitation does not apply here.

Can Apnealytics sync the O2Ring over Bluetooth?

Not today. The ring pairs with Wellue's own app, and the import path is the CSV that app exports. Sharing the CSV from the Wellue app to Apnealytics on your phone takes a few taps and works offline.

Why do my O2Ring dips not line up with my CPAP events?

Usually clock drift between the ring and the machine. Drag the offset control on the night until the dips sit over the events. If they still disagree, that is information: the oximeter and the machine measure different things, and the overlay shows where they part company.

Is the O2Ring data a diagnosis?

No. The O2Ring is a consumer oximeter, and Apnealytics is a tracking tool. The overlay and ODI and T90 numbers are there to help you understand your nights and talk to your clinician, not to diagnose anything.