For owners of a Wellue O2 device
Does a late dinneraffect your sleep?Now you can find out.
Sync your Checkme O2 Max, O2Ring or SleepU in your browser and see weeks or months of overnight data at once.
Tag nights with things like a late dinner, a drink, or a change to your routine. Then compare them side by side and see whether those changes actually show up in your overnight oxygen and heart rate.
- First 5 nights free, then lifetime access for $59. No subscription. 30-day refund.
- Includes the Overnight Oxygen Workbook, with the research behind each experiment.
- Nothing to install. Syncs in Chrome and Edge over Web Bluetooth, or import a CSV.
From the founder
I built this to answer one question about my own sleep.
A while back, I bought a Checkme O2 Max to see what was actually happening with my oxygen overnight.
The question was simple:
If I eat dinner late, does it show up in my sleep that night?
The device recorded the data, but the app made it hard to find patterns. I could see one night at a time, but couldn't easily compare nights or record what I'd done differently.
So I built a better way to explore the data, with comparisons across nights and tags for things like late meals, drinks, and other variables.
For the first time, I could see patterns in my own sleep data.
Then I started digging into the research behind the things I was testing. That became the Overnight Oxygen Workbook, included with PulseOxTracker.
PulseOxTracker is the tool I wish my oximeter had come with.
It turns raw overnight data into something you can actually explore: compare nights, track what you did differently, and look for patterns over time.
Your oximeter already has the data. PulseOxTracker helps you understand it.
Start exploring your own overnight data.
Matt, founder of PulseOxTracker
The problem
One night only tells you so much.
You wake up, check your results, glance at a few numbers, and get on with your day.
The data is there. But it's hard to know what it means without something to compare it to.
You can't easily compare nights
Was last night different from Tuesday? From last month? What about the nights you went to bed early?
When you can only look at one night at a time, you're left trying to remember what happened on the others.
And memory is not a chart.
You can't connect the night to your day
The late dinner. The glass of wine. The workout. The night you went to bed at midnight.
These things can be easy to forget by morning. And if they're not recorded alongside your sleep data, it's difficult to see whether they line up with changes in your overnight oxygen or heart rate.
A number means more when you have something to compare it to
ODI. Lowest oxygen. Time below 90%.
Those numbers tell you what happened on one particular night. But was that night typical for you?
Often, the more useful question isn't “What happened last night?”
It's “How does last night compare to my other nights?”
That's the difference between having a recording and having a history you can actually learn from.
How it works
The device does the measuring. The app does the remembering.
Your oximeter is already good at recording. What it lacks is a long memory and a way to line nights up. That is the whole job of PulseOxTracker.
Sync in the morning
Connect your Wellue O2 device straight from Chrome or Edge over Web Bluetooth. No install, no cable. On another browser, export a CSV from the vendor app and drop it in.
Every night, charted
Each recording becomes a full overnight chart of SpO2 and heart rate, minute by minute. Scroll back weeks or months and see every night in the same format.
Your figures, night after night
ODI, nadir, T90, desaturation count and heart rate, calculated by PulseOxTracker from the readings your oximeter records, then trended over time. They can differ from the figures in the vendor app. Plain numbers, with no labels attached.
Tagged against your habits
Log what happened that evening: a drink, a late meal, a new pillow, a change to your routine. Add your own tags and nightly measures, then see nights with and without each one side by side.
What you get
One payment. The app, and the workbook.
First 5 nights free, then lifetime access for $59. No subscription, no renewal date, nothing to cancel.
PulseOxTracker, lifetime access
Every night you record, synced and charted, for as long as PulseOxTracker runs.
- Unlimited overnight sessions and imports
- Habit tags and nightly measures
- Night-by-night comparisons
- ODI, SpO2, T90 and nadir tracked automatically
The Overnight Oxygen Workbook
A PDF of structured self-experiments to run with your own oximeter, each one grounded in published research.
- Self-experiments on everyday changes to your evening and your sleep setup
- What researchers looked at and what they found, with references
- Suggested tags to log for each experiment
- A simple way to read your before-and-after comparison
The method
Change one thing. Sleep. Compare.
Instead of wondering, you run a small, simple experiment on your own nights and look at what your own recordings show.
Pick one experiment
Choose a single change from the workbook. One change at a time keeps each comparison simple.
Tag the nights
Wear the oximeter as usual. Each evening, tap the tag for what you did. A week or two with the change and a week or two without is a good start.
Read the comparison
PulseOxTracker lines up tagged and untagged nights and shows ODI, nadir, T90 and heart rate for each group. You see what showed up in your data, and you decide what it means to you.
Live demo
Look before you buy.
Open a demo account with two weeks of sample recordings and click through all of it: nightly charts, tags, measures and night-by-night comparisons. The recordings are sample data, not a real person's nights, and the demo is read-only, so nothing you change is saved. No signup needed, and you can decide about the $59 afterwards.
FAQ
Before you decide.
Which device does it work with?
PulseOxTracker works with all Wellue O2 devices: the Checkme O2 Max, the O2Ring and the SleepU. It syncs the device over Bluetooth straight from your browser, and it can also import CSV exports from the Wellue ViHealth app. You need to own the device already; PulseOxTracker does not sell one.
Which browsers does sync work in?
Bluetooth sync uses Web Bluetooth, which works in Chrome and Edge on desktop, and in Chrome on Android. Safari and Firefox do not support it, and neither does any browser on iPhone or iPad. On those, export your nights from the ViHealth app and use CSV import, or run the sync on a computer in Chrome or Edge. Chrome and Edge on Linux, and Brave, have Web Bluetooth switched off until you enable it in the browser flags. There is nothing to install.
Bluetooth setup guideDoes it work with other oximeters?
No. Sync and CSV import are built around Wellue O2 devices and the Wellue export format, so other brands will not import. If you are unsure whether your files will work, open one in the free session viewer first. It needs no account and saves nothing.
Open the free session viewerIs this a sleep study?
No. PulseOxTracker charts and trends the SpO2 and heart rate your oximeter records. A sleep study records more signals, such as airflow and breathing effort, and only a sleep study arranged through a clinician can tell you whether you have sleep apnea. If your recordings or how you feel during the day concern you, take them to a clinician.
What do I get free?
Your first 5 nights, with the whole dashboard: charts, tags, nightly measures and night-by-night comparisons. Each free night also comes with one experiment from the Overnight Oxygen Workbook to try. No card is asked for. Once the 5 nights are used, those nights stay in your account and stay readable; adding more nights and opening the Overnight Oxygen Workbook need lifetime access.
What does lifetime access mean?
It means for as long as PulseOxTracker runs, not for your lifetime. You pay $59 once, with no subscription and no renewal, and the 5-night limit is lifted. Our terms explain what lifetime covers and what happens to your access and data if the service ever closes.
Read the termsWhat is the Overnight Oxygen Workbook?
A PDF of self-experiments to run with your own recordings. Each one covers what to change, what to tag, and the published research behind it, described as what the study found. It comes with lifetime access at no extra cost, and it is not medical advice.
What if it is not for me?
Ask for a refund within 30 days of purchase and you get the full $59 back. You do not need to give a reason. The refund policy is set out in our terms.
Read the termsWhere is my data kept, and who can see it?
Your recordings are health data. They are stored on servers in the EU, tied to your account, and never sold or used for advertising. You can delete any night at any time. The privacy policy has the details.
Read the privacy policyThe promise
30 days. Full refund.
Buy it, sync your nights, open the workbook. If it is not for you within 30 days of purchase, message us through the support button on any page and we will refund the full $59. No forms, and no need to say why. The refund policy is also in our terms.
Read the termsPricing
Pay once. Chart every night.
Your first 5 nights are free, with the whole dashboard and one workbook experiment to try each night. After that, one single payment gets the app and the Overnight Oxygen Workbook. No subscriptions.
Launch price until 31 December 2026. The price rises to $79 on 1 January 2027.
- Unlimited overnight sessions and imports
- Habit tags and nightly measures
- Night-by-night comparisons
- ODI, SpO2, T90 and nadir tracked automatically
- The Overnight Oxygen Workbook PDF
Secure checkout by Stripe
Not a medical device. Does not diagnose, treat or prevent any condition. Discuss results and changes with a clinician.
Tonight is another recording. Make it one you can read.
Start with 5 free nights and see your own data charted, tagged and compared. For a one time payment of $59, every night from there on joins a history you can scroll, tag and compare.
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