Reading your sleep data
OSCAR CPAP Software: How to View Your SD Card Data
OSCAR (Open Source CPAP Analysis Reporter) is free software that reads the detailed data stored on your CPAP's SD card and turns it into graphs of pressure, leak, flow and events. It is useful for spotting problems and for discussions with your clinician, but it is not a reason to change prescribed settings yourself.
What OSCAR is
OSCAR is free, open source desktop software for reviewing data from CPAP and related machines. Its official site at sleepfiles.com says it converts the high resolution data on the device's SD card into graphs, to help you provide data for discussion with your doctor.
As of October 2026, the OSCAR site lists builds for 64 bit Windows 10 and 11, macOS, several Linux distributions, Chromebook and Raspberry Pi OS. Supported machines include many ResMed models (including AirSense 11) and other brands; check the site's list for your model.
Getting your data
Your machine must have an SD card inserted while you use it. ResMed says all AirSense and AirCurve devices have an SD card slot. Remove the card as your manual describes, put it in a card reader on your computer, and open OSCAR.
Create a profile, choose to import, and point OSCAR at the card. When the import finishes, eject the card safely before removing it, then put it back in your machine so it keeps recording.
What you will see
A daily view with your flow rate waveform, pressure, leak rate, and markers for each event type; overview charts of AHI, usage and leak over weeks or months; and statistics like median and 95th percentile pressure.
Look for patterns: events clustered at one time of night, leak spikes, or long periods at the top of your auto pressure range.
Use it to talk with your clinician
OSCAR can print or export reports. Bring a few weeks of summaries to appointments, or share screenshots that show a problem.
Do not use forum advice or OSCAR graphs to change your prescribed pressure or mode. Clinical changes go through your prescribing clinician, who can adjust settings safely and often remotely.
Getting help
OSCAR's site links to setup and first run guides hosted on the Apnea Board wiki. Questions about what your data means medically belong with your clinician.
Keep your OSCAR data backed up; OSCAR 2.0 added profile backup and restore.
Frequently asked questions
Is OSCAR free?
Yes. OSCAR is free, open source software available from sleepfiles.com.
Does OSCAR work with ResMed AirSense 11?
The OSCAR site lists ResMed machines including the AirSense 11 among supported devices. Check the current list for your exact model.
Do I need an SD card for OSCAR?
Yes. OSCAR reads the detailed data stored on the machine's SD card. Cloud apps like myAir do not provide the same detail.
Can I change my CPAP settings with OSCAR?
No, and you should not change prescribed settings yourself. OSCAR is for viewing data. Bring what you find to your clinician.
Sources
Last reviewed October 11, 2026. How we research · Report an error