Best Free CPAP Data Tools Compared (2026)

Four Tools, Different Audiences

If you want to see more than what your CPAP machine's screen shows, you have options. But they serve different audiences, run on different platforms, and show different levels of detail. Picking the right one depends on what you actually need.

This is an honest comparison. CPAP Clarity is one of these tools, so full transparency: we built it to fill a gap the others leave. It reads more than one brand, pulls your oximeter and wearable into the same view, and explains the result in plain English. But every tool on this list does something well, and the right choice depends on your situation.

The Comparison

	CPAP Clarity	OSCAR	myAir	SleepHQ
Price	Free	Free	Free (with ResMed)	$15/mo
Platform	Browser (any device)	Desktop (Windows, Mac, Linux)	Mobile app	Cloud + mobile
Privacy	Client-side only	Local only	Cloud (ResMed servers)	Cloud
Install required	No	Yes (Qt application)	Yes (mobile app)	Yes (mobile app)
Devices	5 brands: ResMed (AS10/11, AirCurve), Philips DreamStation, BMC, React Health Luna G3, Löwenstein	All major brands	ResMed only	ResMed, Philips, Löwenstein, F&P
Wearable sleep + activity	Yes (Oura, Apple Watch, Fitbit, matched to each night)	No	Via Apple Health / Health Connect	Via Apple / Google Health
Data source	SD card (drag and drop)	SD card	Bluetooth/cellular (automatic)	Cloud sync
AHI breakdown	Yes (OA, CA, Hyp, mixed)	Yes (full event detail)	Basic (total only)	Basic
Pressure charts	Yes	Yes (raw waveform)	No	Limited
Leak charts	Yes	Yes	Seal indicator only	Limited
Flow limitation	Yes (chart + insights)	Yes (raw waveform)	No	No
Therapy score	Yes (0-100, 4 components)	No	Yes (0-100, simplified)	No
PDF reports	Yes (shareable)	Yes (printing)	No	No
Insight rules	48 plain-English rules	Manual interpretation	Generic tips	None
Content/articles	70+ articles, glossary	Wiki/forum	None	None
Screening tools	7 standalone tools	None	None	None

CPAP Clarity

Best for: CPAP users who want clear analysis without installing software. First-time data explorers. People who want plain-English insights rather than raw waveforms.

CPAP Clarity is a browser-based tool that reads your SD card and shows AHI breakdowns, pressure and leak charts, a therapy score, and 48 insight rules that explain your data in plain language. It runs entirely in your browser. Nothing is uploaded. No account needed.

Strengths:

• Zero setup. Open the site, drag in your SD card folder, see your data.
• Plain-English insights that explain what your numbers mean and when to talk to your doctor.
• Joins your CPAP nights with a pulse oximeter and your Oura, Apple Watch, or Fitbit, reading each one directly and matching it to the right night, so oxygen and sleep sit next to your therapy across every brand it supports.
• 7 standalone screening tools (Epworth, STOP-BANG, Berlin, ISI, Compliance Calculator, Mask Finder, Sleep Cycle Calculator) that work without any data import.
• PDF reports formatted for your doctor.
• 70+ educational articles on CPAP therapy, sleep apnea, and sleep health.
• Works on phone, tablet, or computer. No install.

Limitations:

• No raw breath-by-breath waveform data (OSCAR's core strength).
• Reads five CPAP brands (ResMed, Philips DreamStation, BMC, React Health Luna G3, Löwenstein), not every brand OSCAR covers (OSCAR adds Fisher & Paykel, DeVilbiss, and others).
• No provider/clinic workflow.

Price: Free. No premium tier. Revenue comes from ads on article pages and affiliate links.

OSCAR

Best for: power users who want maximum data depth. Users with non-ResMed machines. People comfortable with desktop software.

OSCAR (Open Source CPAP Analysis Reporter) is a free, open-source desktop application that has been the gold standard for CPAP data analysis for years. It supports every major CPAP brand and shows data down to individual breaths.

Strengths:

• Supports all major brands: ResMed, Philips, Fisher & Paykel, DeVilbiss, Resvent, Lowenstein.
• Raw waveform data (breath-by-breath flow rates from BRP.edf files). No other consumer tool shows this level of detail.
• Highly configurable charts and date ranges.
• Active community on ApneaBoard forums with decades of collective knowledge.
• Completely free and open source (GPL-3.0).

Limitations:

• Requires installation (Windows, Mac, or Linux). No mobile or web version.
• Steep learning curve. The interface assumes familiarity with sleep data terminology.
• No plain-English interpretation. You need to know what you are looking at.
• No therapy score or automated insights.
• No companion content or educational articles.
• Community-maintained, so updates can be inconsistent.

Price: Free (open source).

myAir

Best for: people who want zero effort. Users who do not want to remove their SD card.

myAir is ResMed's companion app. It connects to your AirSense 10 or 11 via Bluetooth and cellular, automatically syncing your data every day. You see a score from 0 to 100, usage hours, mask seal rating, and events per hour.

Strengths:

• Automatic. No SD card removal, no file transfer, no setup.
• Daily score gives a quick check-in without interpreting charts.
• Sleep coaching tips.
• Available on iOS and Android.

Limitations:

• Dramatically simplified data. No AHI breakdown by event type. No pressure charts. No leak charts. No flow limitation.
• The 0-100 score is opaque. ResMed does not publish the full formula.
• ResMed only (no other brands).
• Data stored on ResMed's cloud servers (not client-side).
• No PDF export. No AI export. No way to share detailed data with your doctor beyond what myAir shows.

Price: Free with any compatible ResMed machine.

The gap myAir leaves: if your myAir score drops and you want to know why, myAir cannot tell you. Was it a leak spike? Pressure change? Cluster of central events? You need your SD card and a tool like CPAP Clarity or OSCAR to answer those questions.

SleepHQ

Best for: users who want cloud-based data access across devices.

SleepHQ is a cloud-based platform that syncs CPAP data and provides analysis accessible from any device. It offers a free tier and a paid Pro subscription.

Strengths:

• Cloud sync means your data is accessible from any device.
• Trend tracking over time.
• Custom PDF reports and a sleep journal on the Pro tier.

Limitations:

• The free tier is limited to one device and your most recent 30 days of data; longer history and multiple devices require Pro.
• Data stored in the cloud (privacy trade-off).
• Less analytical depth than OSCAR or CPAP Clarity.
• Smaller community and less educational content.

Price: Free tier (1 device, most recent 30 days). Pro is $15/month, with periodic discounts and a free trial.

Newer Web Tools (2025-2026)

Two newer tools are worth knowing about, because they take opposite approaches to your data.

SomniCharts is a browser-based analyzer (with a companion mobile app) that, per its own site, reads a wide range of machines, including ResMed, Philips DreamStation and DreamStation 2, Löwenstein Prisma, BMC, and Hoffrichter. It is a subscription product. Its Silver plan runs $10.99/month ($99.99/year) and its Gold plan $19.99/month ($199.99/year), each with a short free trial. The important distinction from CPAP Clarity is where your data lives. SomniCharts runs in the browser but processes and stores your data on its servers (its terms note data may be processed in the US, Canada, or other jurisdictions and is deleted when your membership lapses). CPAP Clarity also runs in the browser, but nothing ever leaves your device. If broad device support in a hosted tool matters more to you than keeping data local, SomniCharts is worth a look; if privacy is the priority, the client-side approach is the difference.

CPAP Analysis is a free iPhone app that reads the SD card directly on your phone through a USB adapter and keeps everything on-device and in your private iCloud, so it shares CPAP Clarity's privacy-first stance. The trade-offs are scope: it is iOS only (no Android, no desktop, no web), works with most ResMed machines only, and focuses on showing your data rather than interpreting it. If you have an iPhone and a ResMed machine and want a quick private read on the go, it is a genuinely nice option. For another phone, another brand, plain-English insights, or a report to hand your doctor, you will want a broader tool.

Which Should You Use?

If you just got a CPAP and want to understand your data: start with CPAP Clarity. Zero setup, plain-English insights, and free. If you outgrow it, OSCAR is always there for deeper analysis.

If you have a non-ResMed machine: OSCAR is your only option with broad device support.

If you do not want to touch your SD card: myAir works automatically but shows you very little.

If you want cloud access from any device: SleepHQ or SomniCharts, but consider the privacy and cost trade-offs of storing your health data on a company's servers.

If you want a private read on an iPhone: CPAP Analysis, if you have a ResMed machine and do not need insights or a doctor's report.

What sets CPAP Clarity apart here: it reads your Oura, Apple Watch, or Fitbit directly, per brand, and lines each night up with your CPAP and pulse oximeter in one view. Where myAir and SleepHQ surface wearable data at all, they lean on an Apple Health or Google Health hand-off rather than stitching the sources into a single cross-source night. If you track more than just your CPAP, that combined picture is the reason to start with CPAP Clarity.

There is no rule against using more than one. Many power users run OSCAR for waveform analysis and CPAP Clarity for the therapy score, insights, and PDF reports. The tools read the same SD card data and do not interfere with each other.

What You Need to Get Started

All SD-card-based tools (CPAP Clarity and OSCAR) need you to remove the SD card from your machine and connect it to your computer. You will need an SD card reader (opens in new tab) if your computer does not have a built-in slot. For the best data quality, use a reliable card such as the SanDisk Ultra 32GB SDHC UHS-I (opens in new tab) (native full-size SDHC) and replace it if your machine reports read/write errors.

Frequently Asked Questions

What is the best free CPAP data tool?

It depends on what you need. If you just got a CPAP and want clear analysis with zero setup, CPAP Clarity is a good starting point: it is free, runs in your browser, and explains your data in plain English. If you want maximum data depth or have a non-ResMed machine, OSCAR is the free, open-source choice. Both are free, so many users try one and reach for the other when they want something it does not offer.

What is the difference between OSCAR and myAir?

OSCAR is a free desktop application that reads your SD card and shows deep detail, including raw breath-by-breath waveforms, full AHI breakdowns, and pressure, leak, and flow-limitation charts. myAir is ResMed's companion app that syncs automatically over Bluetooth and cellular, so you never touch the SD card, but it shows dramatically simplified data with no event-type breakdown and no pressure or leak charts. OSCAR supports all major brands, while myAir works with ResMed only. In short, OSCAR trades convenience for depth, and myAir trades depth for convenience.

Is CPAP Clarity or OSCAR easier to use?

CPAP Clarity is designed to be easier for most people. You open the site, drag in your SD card folder, and see your data with plain-English insights, no install required. OSCAR is more powerful but has a steep learning curve, and its interface assumes you already know sleep-data terminology and how to interpret raw waveforms.

Do I need to install software to read my CPAP data?

Not with CPAP Clarity, which runs entirely in your browser with no install and no account. OSCAR is a desktop program, and myAir and SleepHQ are mobile apps. SomniCharts is also browser-based, so the honest distinction there is not install versus no-install but where your data lives: CPAP Clarity keeps everything on your device, while SomniCharts stores it on its servers.

Can I read ResMed SD card data without myAir?

Yes. myAir only shows a simplified daily score and cannot tell you why that score changed. To see the detail behind it, such as a leak spike, a pressure change, or a cluster of central events, you remove your SD card and open it in CPAP Clarity or OSCAR. Both read the same SD card data that myAir leaves out.

Which CPAP data tool works in a web browser without uploading my data?

CPAP Clarity. It is browser-based and runs entirely client-side, so nothing is uploaded and no account is needed. OSCAR is local-only but is a desktop install rather than a browser tool. SomniCharts runs in a browser too, but it uploads and stores your data on its servers, and myAir and SleepHQ store your data on cloud servers as well.

Try CPAP Clarity

Import your SD card data at cpapclarity.com to see what your machine is recording. No account, no uploads, no cost. Takes about 60 seconds. If you want to learn more about reading your data first, start with How to Read CPAP Data.

Primary Sources

Pricing and feature details for the third-party tools were checked against each product's own site when this comparison was written. These figures move, so confirm the current number on the source page before relying on it.

• SleepHQ. Memberships. Source for the free-tier limits (1 device, most recent 30 days) and the $15/month Pro price. sleephq.com memberships (opens in new tab)
• SomniCharts. Subscriptions and Introduction. Source for the browser-based hosted model, supported-device list, and the Silver ($10.99/mo) and Gold ($19.99/mo) pricing. somnicharts.com subscriptions (opens in new tab)
• CPAP Analysis. Official site. Source for the free iPhone-only app that reads ResMed SD cards on-device and stores data in your private iCloud. cpapanalysis.com (opens in new tab)
• OSCAR (Open Source CPAP Analysis Reporter). Official download page. Source for the current version (2.0.1) and that OSCAR is free and open source. sleepfiles.com OSCAR (opens in new tab)