OSCAR CPAP Software - Complete Free Guide 2025

OSCAR - The Free Software to Analyse Your CPAP Data

OSCAR (Open Source CPAP Analysis Reporter) is a free, open-source software that provides detailed analysis of data recorded by your CPAP machine. Unlike the myAir app which displays a simplified score, OSCAR gives you access to all raw therapy data: night-by-night residual AHI, pressure curves, leaks, apneas, hypopneas and more.

OSCAR is an information tool. It does not replace medical advice. Pressure settings should only be changed on medical prescription.

Compatible Devices

ResMed: AirSense 11 AutoSet, AirSense 11 Elite, AirSense 10 (all models), AirCurve 10, S9 - via SD card
Philips Respironics: DreamStation 2, DreamStation 1, REMstar series
Löwenstein: prismaLINE (certain models)
Fisher & Paykel: SleepStyle

Download and Installation

OSCAR is available free at: https://www.sleepfiles.com/OSCAR/

Download the version for your operating system: Windows (64-bit recommended), macOS, or Linux.

Importing data from a ResMed device

Remove the SD card from your device.
Insert it into an SD card reader connected to your computer.
Launch OSCAR and click "Import CPAP Data".
Navigate to the SD card and select it.
OSCAR automatically imports all recorded nights.

Understanding Your Data in OSCAR

Residual AHI (Apnea-Hypopnea Index)

Residual AHI	Interpretation
< 5	Excellent - well-controlled therapy
5 to 10	Acceptable - room for improvement
10 to 15	Inadequate - discuss with doctor
> 15	Poorly controlled - urgent consultation recommended

Mask Leaks

OSCAR shows leak rate in L/min. Keep unintentional leaks below 24 L/min for nasal masks and 36 L/min for full-face masks.

Pressure Curve

OSCAR shows pressure delivered second by second. Key metrics:

Median pressure (P50)
95th percentile pressure (P95) - indicates if the pressure ceiling is often reached
Pressure peaks - associated with untreated respiratory events

Event Types

OA (Obstructive Apnea): airway blocked.
H (Hypopnea): partial airflow reduction.
CA (Central Apnea): brain fails to send breathing signal - not treated by standard CPAP.
RE (RERA): respiratory effort-related arousal.

OSCAR vs myAir

Criteria	myAir	OSCAR
Access	Smartphone / web app	PC / Mac software
Data	Simplified score, daily summary	Full raw data, detailed graphs
Compatibility	ResMed only	ResMed, Philips, Löwenstein, F&P
Cost	Free	Free (open source)

---