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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.
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) |
Frequently asked questions about OSCAR software
Yes, completely. OSCAR (Open Source CPAP Analysis Reporter) is free and open-source software. You download it from sleepfiles.com without creating an account, without subscription, without ads. Development is handled by a volunteer community of developers and CPAP patients. No features are hidden behind a paywall: the free version is the full version. It is the most advanced open-source alternative to myAir and DreamMapper.
Yes, OSCAR is available as native versions for Windows (64-bit recommended), macOS and Linux. The interface and features are identical across all three platforms. The Mac version runs equally well on Intel Macs and Apple Silicon Macs (M1/M2/M3). There is no official mobile app - OSCAR requires a computer to read your CPAP's SD card. On tablet or phone, the myAir app remains the official tool.
The AirSense 11 has an integrated SD card. To export: turn off the device, gently remove the SD card (slot on the side), insert it into a card reader connected to your computer, launch OSCAR and click "Import CPAP Data". Select the SD card drive - OSCAR automatically detects the ResMed format and imports all recorded nights. Then put the card back in the device so it continues recording.
Yes, OSCAR supports the Philips DreamStation 2 via SD card or USB cable. Compatibility is constantly improving thanks to the open-source community. Note however that some advanced DreamStation 2 metrics (particularly certain Philips-specific sensors) are not always interpreted identically between OSCAR and the official DreamMapper app. The main data (AHI, leaks, pressure) remain perfectly readable.
myAir is a mobile/web app that displays a simplified daily score (out of 100) with main indicators: residual AHI, leaks, usage hours. It is the ideal tool for quick daily monitoring. OSCAR is PC/Mac software that displays complete raw data: second-by-second curves, event types (OA, H, CA, RERA), P50/P95 pressure, multi-month trends. OSCAR requires a learning curve but allows much finer analysis. Both are complementary.
OSCAR shows leak rate in litres per minute (L/min) on a time-based curve. Leaks break down into two components: intentional leak (the mask's expiratory vent, normal) and unintentional leak (sealing problem). Keep below 24 L/min for a nasal/nasal pillow mask and 36 L/min for a full-face mask. An occasional spike is not serious; a continuous, high leak requires inspecting the cushion and headgear.
No, it is a complement, not a replacement. OSCAR gives you access to your data, but clinical interpretation and any pressure changes must remain your doctor's responsibility. OSCAR is particularly useful for preparing your consultations: export reports as PDF and show them to your pulmonologist. This turns a consultation where you subjectively describe your feelings into a fact-based discussion built on numbers.
Yes, you need an SD card reader to connect your CPAP's card to your computer. Most recent laptops have one, but rarely modern MacBooks and ultrabooks. A USB-SD adapter costs 5 to 15 EUR and works with all computers. For the DreamStation 2, a direct USB cable is also possible. This is the only additional hardware needed to get started with OSCAR.