PRODUCT

See every breath: the CPAP waveform viewer

An AHI is a count. A waveform is the night itself. The Apnealytics CPAP waveform viewer renders airflow, pressure, leak and event strips for any night from the raw files on your ResMed card, in your browser or on your phone, with no desktop software to install.

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Free on every plan · Web, iPhone, iPad, Android

Real night detail waveform panel in a browser frame: event strip, airflow, mask pressure and leak traces for Sep 25 with drag-to-zoom

What it is

Your ResMed machine writes two kinds of data to its card: a summary of each night, and the high-resolution raw signals in its DATALOG folder. Most apps only read the summary. The breath-by-breath viewer reads the raw signals too, so you can open a night, scroll to 3:14 a.m., and see exactly what your breathing and your machine were doing when that cluster of events was flagged.

Four stacked aligned traces over a ten-minute window: airflow, pressure with EPR exhale drops, leak with a bump near the 24 L/min line, event strip with OA/CA/H markers; crosshair tooltip with values at 02:18:35

How it works

Upload once
The raw DATALOG files come across with your normal SD card import and sit in private storage.
Open a night
From the dashboard, Trends or the Nights list, tap a night to see its detail page.
Waveforms parse on demand
The raw files for that night are parsed lazily, in your browser or on your phone, when you open the view. Nothing is pre-rendered, so your storage stays yours and the first upload stays fast.
Explore
Drag the crosshair to read values at any instant, pinch or scroll to zoom from the whole night down to a few breaths, and tap an event marker to jump straight to it.
Correlate
Add a trigger journal note, such as late meal, alcohol, new pillow or a cold, and Apnealytics shows how your AHI correlates with each trigger over time.

What you'll see

Four aligned traces
Airflow — the shape of each breath. Flattened tops suggest flow limitation; long pauses are where the machine flagged apneas. · Pressure — what the machine delivered, including the drop on exhale if EPR is on and the ramp at the start of the night. · Leak — the moment a seal broke, how long it lasted and whether pressure followed. · Event strip — obstructive, central, hypopnea and unclassified markers on the same time axis, so you can line an event up with the breath that caused it.
Crosshair and zoom
A crosshair reads the value of every trace at the same instant. Zoom runs from the full night to individual breaths, and the time axis stays aligned across traces at every level.
Night summary beside the traces
Sleep Score, AHI and band, event composition, usage, leak P95, pressure P95 and set range, EPR, respiratory rate, SpO₂ median and total event count, so the context is never more than a glance away.
Trigger journal
Tag the night and see, over weeks, which habits travel with a higher AHI. The correlation is descriptive, not a diagnosis, but it is often the fastest way to notice a pattern worth raising with your clinician.

Waveform view on iPhone zoomed to a two-minute window around a cluster of hypopneas, crosshair reading airflow, pressure, leak and event

Free vs Pro

Night detail, including the summary figures and the trigger journal, is free. Per-night waveforms are a Pro feature. Pro is $8.99 a month or $99.99 a year and also unlocks full history, oximetry overlays, reports, share links, multiple machines and the API.

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FAQ

Questions people ask

Help center →

What do CPAP waveforms show?

The raw signals your machine recorded through the night: airflow (the shape and size of each breath), pressure delivered, leak rate and the events the machine flagged. Reading them together shows how an event unfolded, whether leak was involved, and how the machine responded. Our guide to reading the waveforms walks through the common shapes.

Do I need OSCAR to see my waveforms?

No. OSCAR is excellent free desktop software, but it runs only on Windows, Mac or Linux and has no phone app or cloud. Apnealytics renders the same ResMed raw signals in your browser and on your phone, with your summary data, vitals and reports in the same place. Many people use both.

Why do waveforms load when I open a night rather than at upload?

Because parsing every night's raw signals up front would be slow and wasteful; most nights never need a close look. Parsing on demand keeps the first upload quick and keeps the raw files unchanged in your private storage. The first open of a night takes a few seconds; after that it is cached for the session.

Can I see waveforms on my phone?

Yes. The iPhone, iPad and Android apps parse and render waveforms on the device, with pinch-to-zoom and the same crosshair. Card upload itself remains web-only today, so upload on a computer and then open any night from your phone.

Can I tell flow limitation from the airflow trace?

Often, yes. Breaths with flattened or scooped tops suggest the airway is narrowing even when no event is scored. Apnealytics shows you the shape; it does not score flow limitation as a diagnosis. If you see a lot of it, that is a good observation to bring to your clinician.

Which machines provide waveform data?

ResMed AirSense 10 and 11, AirCurve 10 and 11 and the S9 / Lumis families all write DATALOG files that Apnealytics reads. Philips DreamStation 1 and 2 and Fisher & Paykel SleepStyle work the same way, and Löwenstein support is partial. Learn more on the works-with hub.