Beyond myAir: What Your ResMed Really Records

The Dashboard You See vs. the Data You Have

If you use a ResMed AirSense 10 or 11, you probably check myAir every morning. You open the app, see a score out of 100, glance at your usage hours, and move on. Most days, you feel good about a high score. Some days, you wonder why the number dipped.

In practice, myAir shows you part of what your machine actually records. Every night, your CPAP captures thousands of data points across dozens of metrics. myAir turns that into a score, a few key numbers and, on newer machines, a timeline of the night. That's like reading the box score and the highlights of a basketball game.

Your SD card has the full game film. This is what it adds.

What myAir Actually Shows You

myAir's morning view is built around four numbers:

Daily score (0 – 100). A published blend of usage, mask seal, events, and mask on/off count, weighted heavily toward usage (what each part is worth)
Usage hours. How long your mask was on
Events per hour. Your AHI, the number of breathing disruptions per hour
Mask seal. Up to 20 of the score's points. ResMed's myAir user guide gives up to 20 points for minimal mask leak, 10 to 15 for moderate leak, and 0 to 10 for higher leak

The Nightly Timeline (Air11 machines)

In October 2026 ResMed updated myAir (opens in new tab) with a Nightly Therapy Timeline. ResMed says it "transforms detailed device data into a chronological view of your therapy night." You can see when key events occurred and when the mask went on and off, with plain explanations of therapy terms. ResMed's US myAir page (opens in new tab) says it is available to myAir users with an Air11 device, such as the AirSense 11. ResMed has not published a country-by-country list, so it may not be in your app yet.

Therapy Control (AirSense 11, US and Canada)

Since August 2025, myAir users in the US and Canada have had Therapy Control (opens in new tab). On an AirSense 11 it uses Bluetooth to start and stop therapy from your phone and to adjust comfort settings like ramp time, pressure relief, humidity and tube temperature. ResMed's user guide lists it for Air11 CPAP machines only. These are comfort settings. ResMed does not describe it as a way to change your prescribed therapy pressure.

Where the App Stops and the Card Takes Over

For a daily check-in, this is a real step up. The timeline answers a question myAir used to leave open, which is when your events happened. ResMed also says you can see up to 12 months of data (opens in new tab) in myAir and share a report of your therapy for the past 30, 90 and 365 days. ResMed does not describe pressure or leak graphs, a breathing waveform, or the respiratory metrics below, and it has not said the timeline lists the same events your SD card records. For the full recording, or to bring detailed data to a doctor, the card is still the place to look.

What the SD Card Adds

Your ResMed machine records a staggering amount of detail to its SD card. Here's what you can see from it:

Event Type Breakdown

Your AHI is a single number, but it's made up of very different event types. Understanding the difference matters because the treatment approach changes depending on what's happening:

Obstructive apneas: Your airway physically collapses. Pressure adjustments can help.
Central apneas: Your brain pauses the breathing signal. More pressure won't fix this, and may make it worse.
Hypopneas: Partial airflow reduction. The most common event type for most users.
RERAs: Subtle disruptions that cause brief arousals.

Knowing that your AHI of 4.0 is mostly central apneas tells a completely different story than an AHI of 4.0 that's mostly obstructive. The myAir score counts every type in one events-per-hour number, and ResMed has not published which types the new timeline labels, so the card is where you see the full breakdown for every night.

Pressure and Leak Charts

Your auto-adjusting machine varies its pressure throughout the night, responding to events and airway changes in real time. The pressure curve reveals patterns you can't see any other way: whether the machine is working hard in the early hours, whether a sudden pressure spike coincides with an event cluster, whether your pressure is consistently hitting the top of its range (check the 95th-percentile pressure, a sign you may need a prescription adjustment).

Leak data is equally revealing. A leak chart shows you exactly when your mask seal broke, how long it lasted, and whether it coincided with respiratory events. That 2 AM spike in your AHI? It might trace directly to a leak that started at 1:45 AM when you rolled onto your side.

Respiratory Metrics

Your machine tracks your breathing patterns in detail:

Respiratory rate: Breaths per minute, tracked continuously through the night
Tidal volume: How much air you move with each breath
Minute ventilation: Total air volume per minute (rate times depth)
Snore index: Detected snoring events and their intensity
Flow limitation: Subtle airway narrowing that hasn't progressed to an apnea yet

These metrics paint a picture of your breathing quality that goes far beyond "you had X events." Flow limitation, for example, is an early warning sign. Catching rising flow limitation before it becomes elevated AHI gives you and your provider an opportunity to intervene early.

Every Event, With Its Exact Time

On Air11 machines, myAir's Nightly Timeline now shows when key events happened. Your SD card goes further. It records every respiratory event with its exact timestamp and duration, on the AirSense 10 as well as the 11, for every night the card holds. That full record reveals clustering patterns. Were your events spread evenly through the night, or did 80% of them happen in a single hour? Did they correlate with a positional change? Did they cluster during what was likely REM sleep in the early morning hours?

This temporal information is clinically valuable. Your sleep doctor can use event timing to make targeted adjustments rather than broad changes.

The myAir Score Problem

The myAir score has a blind spot. You can score 100/100 with an AHI of 4.9, which sits right at the edge of the under-5 mark the AASM associates with well-controlled therapy, so it's borderline. An AHI of 4.9 means you're experiencing nearly five breathing disruptions every hour, roughly one every twelve minutes.

The scoring system also weights usage heavily. Usage is 70 of the 100 points, so sleep for seven hours with mediocre therapy quality and you'll outscore someone who slept six hours with excellent control. The score rewards compliance over effectiveness.

This creates a false sense of security. Users see 95 or 100 and assume everything is perfect. Meanwhile, their detailed data might reveal a mask leak pattern that's undermining therapy for two hours every night, or a rising trend in central apneas that deserves medical attention. The score says "great." The data says "let's take a closer look."

What Your SD Card Actually Contains

Your ResMed SD card stores data in EDF (European Data Format), a medical standard used across sleep medicine. Our CPAP SD card guide covers the full file structure and how to remove and reinsert the card safely. Here's what's inside, organized by file type:

Session data (PLD files): Recordings of mask pressure, therapy pressure, EPR pressure, leak rate, respiratory rate, tidal volume, minute ventilation, snore index, and flow limitation, one sample every 2 seconds. This is the raw time-series data that powers detailed charts.

Event annotations (EVE files): Every respiratory event your machine detected, stamped with the exact start time, duration, and classification (obstructive apnea, central apnea, hypopnea, or RERA).

High-resolution flow data (BRP files): Breath-by-breath airflow waveforms at 25 samples per second. This is the highest-resolution data your machine records.

Daily summaries (STR.edf): A single file containing daily totals for every metric, going back over a year. This is where long-term trend analysis comes from: AHI averages, leak percentiles, pressure ranges, and usage statistics for every single day.

Oximetry data (SA2 files): If you have an oximeter connected, your blood oxygen levels and pulse rate are recorded here.

All together, a single night of data contains thousands of individual measurements. A month of data contains tens of thousands. The myAir score summarizes all of this into one number between 0 and 100.

How to Access the Full Picture with CPAP Clarity

Getting from your SD card to a full analysis takes about 60 seconds:

Remove your SD card. On both the AirSense 11 and AirSense 10, open the small cover on the left side (opposite the humidifier water tub) and push the card to eject it.
Connect it to your computer. Use your laptop's built-in reader or a USB SD card reader.
Open cpapclarity.com and drag in your data. Drop the whole SD card onto the import area, not the DATALOG folder inside it. Processing takes a few seconds.
Explore your dashboard. You'll see your AHI broken down by event type, stat cards for every metric with color-coded health indicators, time-series charts showing your entire night, and plain-English insights explaining what your data means. For a full walkthrough, see our how-to guide.
Download a report. Generate a detailed PDF for your records or your next doctor appointment. Your sleep physician will appreciate the event breakdown and pressure data.

Your data never leaves your device. There's no account to create, no cloud upload, no server that touches your health information. Everything runs in your browser.

Feature Comparison: myAir vs. CPAP Clarity

Feature	myAir	CPAP Clarity
Price	Free	Free
AHI number	Yes	Yes
AHI by event type	Not published by ResMed	Yes
Event timeline	Yes, on Air11 machines (since October 2026)	Yes, every event with its exact time
Breath-by-breath flow waveform	Not described by ResMed	Yes
Leak rate charts	Not described by ResMed	Yes
Pressure charts	Not described by ResMed	Yes
Respiratory rate	Not described by ResMed	Yes
Tidal volume	Not described by ResMed	Yes
Flow limitation	Not described by ResMed	Yes
Change comfort settings from your phone	Yes, AirSense 11 in the US and Canada	No, it only reads your data
Explanations	Coaching tips and timeline explanations	Plain-English insights personalized to your data
Downloadable report	A sleep therapy summary for the past 30, 90 and 365 days	Yes, a full therapy report
Multi-night history	Up to 12 months of data in the app	Everything on your card, with therapy score
Privacy	Cloud (ResMed servers)	100% local (browser only)
Account required	Yes	No
Works on phone	App only	Any browser

Can You Use Both? (Yes, and You Should)

myAir and CPAP Clarity serve different purposes, and they complement each other well.

Use myAir for your daily check-in. It syncs automatically, it's convenient, and it confirms your machine is working. The daily score is a quick pulse check that takes five seconds, and on an Air11 machine the Nightly Timeline shows when your events happened, and on an AirSense 11 Therapy Control lets you adjust comfort settings without the machine's menus. If its hours ever disagree with your card, see why myAir's hours can differ from the SD card.

Use CPAP Clarity for the real analysis. When you want to understand a bad night, track trends over weeks, prepare for a doctor visit, or investigate why your AHI is creeping upward, pull your SD card and see the full data. The event breakdown alone is worth the 60 seconds it takes.

Think of myAir as the speedometer in your car. It tells you how fast you're going right now. CPAP Clarity is the diagnostic computer that shows engine performance, fuel efficiency, tire pressure, and maintenance history. You check the speedometer every day. You plug in the diagnostic tool when you want the complete picture.

Frequently Asked Questions

What does myAir not show you?

myAir's morning view shows a daily score, usage hours, events per hour (AHI), and mask seal. Since October 2026, Air11 machines also get a Nightly Timeline that shows when key events happened and when the mask went on and off. ResMed does not describe pressure or leak charts, the breath-by-breath flow waveform, respiratory rate, tidal volume, or flow limitation in myAir. Those are all on your SD card, along with every event and its exact time for every night the card holds.

What data does my ResMed CPAP record on the SD card?

Your ResMed SD card stores data in EDF (European Data Format), a medical standard used across sleep medicine. It includes session recordings (PLD files, one sample every 2 seconds) of mask pressure, therapy pressure, leak rate, respiratory rate, tidal volume, minute ventilation, snore index, and flow limitation, plus event annotations (EVE files), high-resolution breath-by-breath flow data (BRP files), daily summaries (STR.edf), and oximetry data (SA2 files) if an oximeter is connected. A single night contains thousands of individual measurements.

Is the myAir score accurate?

The myAir score has a blind spot. You can score 100 out of 100 with an AHI of 4.9, which sits right at the edge of the under-5 mark the AASM associates with well-controlled therapy, so it's borderline. The scoring also weights usage heavily, so it rewards compliance over effectiveness. This can create a false sense of security while your detailed data might reveal a mask leak pattern or a rising trend in central apneas that deserves a closer look.

Where can I see my pressure and leak charts?

On your SD card. Your auto-adjusting machine varies its pressure throughout the night and records leak data, and ResMed does not describe pressure or leak charts in myAir. The pressure curve reveals patterns like whether your pressure is consistently hitting the top of its range, and the leak chart shows exactly when your mask seal broke and whether it coincided with respiratory events. CPAP Clarity reads this directly from your SD card and renders time-series charts of your entire night.

Does myAir show obstructive vs central apnea events?

The myAir score counts every event type together in one events-per-hour number. The Nightly Timeline on Air11 machines shows when key events happened, but ResMed has not published which event types it labels or whether it lists every event. Your SD card records each event's classification (obstructive apnea, central apnea, hypopnea, or RERA), and this distinction matters because the treatment approach changes. Pressure adjustments can help obstructive apneas, but more pressure will not fix central apneas and may make them worse.

Can I use myAir and a full data tool at the same time?

Yes, and they complement each other well. Use myAir for your daily check-in, since it syncs automatically and gives a quick five-second pulse check that your machine is working, and on an AirSense 11 in the US or Canada it also lets you adjust comfort settings. Use a full data tool like CPAP Clarity for the real analysis when you want to understand a bad night, track trends, or prepare for a doctor visit by pulling your SD card and seeing the complete picture.

See What You've Been Missing

If you've been relying on myAir alone, you've been seeing your nights through a score and, on newer machines, a timeline, while the most detailed record, the airflow signal recorded 25 times a second, every event with a timestamp, and the full pressure trace, sits on the SD card inside your machine.

Pull the card. Drop it in. In about a minute, you'll see your CPAP data the way it was meant to be seen: detailed, visual, and understandable.

Try CPAP Clarity free, no account needed →