CPAP Machine Comparison (5 Brands, 2026)

The best CPAP machine is the one that treats your sleep apnea effectively and gives you access to your own data. Every machine on this page does the core job well. The differences come down to how the algorithm responds to events, how openly the machine shares its data with you, and what the accessory ecosystem looks like. This guide compares all five major brands side by side so you can understand what you have or make an informed choice.

Quick Comparison

	ResMed AirSense 11	BMC E-20A / G3 A20	Luna G3	Lowenstein Prisma Smart	Philips DreamStation 2
Type	Auto-CPAP	Auto-CPAP	Auto-CPAP	Auto-CPAP (APAP/CPAP modes)	Auto-CPAP
Algorithm	AutoSet (proactive)	AutoCPAP (event-reactive)	AutoCPAP (event-reactive)	AutoCPAP + SoftPAP relief	Auto-CPAP (reactive)
Noise	26.6 dBA	Moderate	Moderate	Quiet	~26 dBA
Data format	EDF (open standard)	Proprietary binary	Proprietary binary	JSON + XML + WMEDF	Proprietary
SD card	Yes (full-size)	Yes (full-size)	Yes (full-size)	Yes (full-size)	Yes (full-size)
Companion app	myAir	RESmart	RESmart / Luna app	prismaCONNECT	DreamMapper
CPAP Clarity support	Full	Full	Full	Full	Not supported
Pressure relief	EPR (3 levels)	EPR-equivalent	EPR-equivalent	SoftPAP (3 levels)	Flex / Flex+
Market	Global	Global (budget segment)	North America	Europe (primarily)	Global

All five machines use a standard full-size SD card (32GB max, FAT32). See our SD card buyer's guide for recommendations.

How the Algorithms Differ

Every auto-CPAP machine solves the same problem: detect when your airway is narrowing or collapsing and increase pressure to keep it open. The differences are in timing and sensitivity.

ResMed AutoSet monitors airflow continuously for flow limitation, which is the subtle flattening of the inspiratory waveform that happens before a full apnea or hypopnea. It raises pressure proactively, often preventing events before they score. This approach tends to produce lower AHI numbers and smoother pressure curves. The algorithm is well-documented in clinical literature, and most sleep physicians are familiar with its behavior. For more on how pressure settings work, see our pressure settings guide. ResMed also offers EPR (Expiratory Pressure Relief) at three fixed levels, which drops pressure when you exhale for comfort.

BMC and Luna G3 share the same underlying platform (Luna G3 is manufactured by BMC and rebadged by React Health for the North American market). Their AutoCPAP algorithm is more event-reactive: it detects apneas and hypopneas after they begin and raises pressure in response. This means the pressure curve can show sharper steps compared to ResMed's smoother ramp. For most users the clinical outcome is equivalent, but the data patterns look different. Both machines offer an EPR-equivalent comfort feature. See our BMC E-20A review, BMC G3 A20 review, or Luna G3 review for details on each.

Lowenstein Prisma Smart uses an AutoCPAP algorithm that detects obstructive events and adjusts pressure automatically, comparable to other brands' auto-titrating modes. Its signature feature is SoftPAP, Lowenstein's pressure-relief system (analogous to ResMed's EPR), which clinicians in Europe praise for comfort. The Prisma Smart is the dominant machine in several continental European markets (Germany, Austria, Croatia, and others) and is typically prescribed directly by sleep clinics rather than purchased by patients. See our Prisma Smart review for a deep dive.

Philips DreamStation 2 uses an Auto-CPAP algorithm that has historically been considered slightly more reactive than ResMed's. Some users find the lower average pressure more comfortable; others experience more residual events because the machine responds after partial obstruction rather than before. Philips offers Flex and Flex+ modes for expiratory relief.

In practice, all five algorithms treat obstructive sleep apnea effectively. Clinical outcomes for moderate-to-severe OSA are comparable across brands. The difference matters most for complex cases or treatment-emergent central sleep apnea, where ResMed's documentation gives clinicians more to work with.

Which Gives You the Best Access to Your Data?

This is the area where the brands diverge the most, and the reason CPAP Clarity exists.

ResMed records therapy data to the SD card in EDF (European Data Format), an open medical data standard. The files contain breath-by-breath flow data, pressure waveforms, leak rates, respiratory events with timestamps, and daily summary statistics going back over a year. Because the format is open and well-documented, multiple third-party tools can read it: OSCAR, SleepHQ, and CPAP Clarity among them. ResMed also offers myAir, a companion app that syncs via Bluetooth and provides a simplified daily score. myAir is convenient for quick checks but hides most of the detail that makes your data actionable.

BMC and Luna G3 record to a proprietary binary format on the SD card. The manufacturer apps (RESmart for BMC, the Luna app for React Health) show basic summaries. CPAP Clarity parses the proprietary format directly, giving you the same depth of analysis as ResMed users: AHI breakdown by event type, pressure curves, leak trends, and session-level detail. OSCAR can also read BMC data.

Lowenstein Prisma Smart records in a mix of JSON (configuration), XML (events), and WMEDF (waveform signals). The manufacturer apps (prismaCONNECT for clinicians, Prisma APP for patients) are tied to the Lowenstein ecosystem and are not widely available outside clinical settings. CPAP Clarity parses all three file types, including per-second pressure and leak waveforms. OSCAR can also read Prisma data.

Philips DreamStation 2 records to the SD card in a proprietary format. OSCAR can read some of the data, but the detail level is more limited compared to ResMed's output, particularly for waveform signals. Philips' DreamMapper app provides AHI, usage hours, and leak status, similar to myAir's simplified view. CPAP Clarity does not currently support Philips data.

The bottom line: if you want to see what your machine is actually doing every night, ResMed gives you the most open data. BMC, Luna G3, and Lowenstein are proprietary but fully readable through CPAP Clarity and OSCAR. Philips is the most restricted.

What About Reliability and Recalls?

In June 2021, Philips issued a Class I recall (the FDA's most serious category) of nearly all DreamStation 1 devices. The polyester-based polyurethane foam used for sound dampening could degrade, potentially releasing particles into the airway. Millions of users were affected, class-action lawsuits followed, and the replacement process was slow. The DreamStation 2, released afterward, does not use the problematic foam and has not been subject to any recall.

ResMed, BMC, React Health (Luna G3), and Lowenstein have no recall history on their current-generation CPAP lines. Typical CPAP lifespan is 5 to 7 years across all brands.

For users choosing between brands in 2026: all five current-generation machines appear well-built. If an unbroken track record matters to you, ResMed's is the longest. If you're considering a DreamStation 2, the foam issue does not apply to that model.

Accessories by Brand

CPAP accessories (filters, water chambers, SD cards) are not prescription items. They wear out on a schedule and are straightforward to replace. Here's what each brand uses.

Disposable Filters

Every CPAP machine uses a disposable air filter that should be replaced every 30 days. The filters are brand-specific.

Disposable CPAP filters by brand

ResMed AirSense 11 / AirCurve 11

ResMed AirSense 11 Filters (30-pack)

Standard disposable filters for AirSense 11 and AirCurve 11 machines. Replace every 30 days.

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ResMed AirSense 10 / AirCurve 10

ResMed AirSense 10 Filters (30-pack)

Standard disposable filters for AirSense 10 and AirCurve 10 machines. Replace every 30 days.

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BMC E-20A / G3 A20

BMC RESmart Filters

Compatible disposable filters for BMC E-20A and G3 A20 machines. Third-party, not OEM.

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More disposable filters by brand

React Health Luna G3

Luna G3 Filters (60-pack)

Compatible disposable filters for React Health Luna G3 machines. Third-party, not OEM.

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Lowenstein Prisma Smart

Lowenstein Prisma Filters (2-pack)

Compatible replacement filters for Lowenstein Prisma Smart machines. Third-party, not OEM.

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Water Chambers

Heated humidifiers are built into most modern CPAPs. The water chamber should be replaced every 6 months or when mineral buildup is visible despite regular cleaning. Use only distilled water.

CPAP water chambers

ResMed AirSense 10 / AirCurve 10

ResMed AirSense 10 HumidAir Water Chamber

Genuine ResMed HumidAir chamber for AirSense 10 and AirCurve 10. Replace every 6 months.

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ResMed AirSense 11 / AirCurve 11

ResMed AirSense 11 Water Chamber

Compatible water chamber for AirSense 11 and AirCurve 11 machines.

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All Brands

Distilled Water (6-pack, 1 gallon each)

Distilled water for any CPAP humidifier. Prevents mineral buildup that damages the chamber.

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BMC, Luna G3, and Lowenstein machines also use built-in heated humidifiers. Replacement chambers for these brands are typically ordered through the prescribing clinic or the manufacturer's local distributor rather than Amazon, since they are not widely stocked in North American retail channels.

SD Cards and Readers

All five brands use the same standard full-size SD card (32GB max, FAT32). One card works in any machine. See our complete SD card guide for picks and reader recommendations.

For a full replacement schedule covering filters, tubing, mask cushions, and more, see our CPAP supply replacement guide.

Common Questions

Can I switch CPAP brands without a new prescription?

Your prescription specifies the pressure range your sleep physician determined during your titration study. Any auto-CPAP machine can be set to that range regardless of brand. The switch itself is straightforward, but your DME supplier or clinic may need to update the equipment record. Talk to your provider before switching.

Do masks work across brands?

Yes. CPAP masks use a universal 22mm connector. A ResMed AirFit mask works fine on a BMC machine, and a Philips DreamWear mask works on a ResMed. The machine does not check which brand of mask is attached. See our mask types guide for help choosing.

Which CPAP is quietest?

The ResMed AirSense 11 (26.6 dBA per ResMed's specs) and Philips DreamStation 2 are the quietest on paper. The Lowenstein Prisma Smart is also quiet. BMC and Luna G3 machines are slightly louder at normal pressure settings but still unobtrusive. In practice, all five are quiet enough that most bed partners will not notice them.

Is a BMC or Luna G3 as good as a ResMed?

For treating obstructive sleep apnea, yes. All auto-CPAP machines do the same fundamental job: detect airway obstruction and increase pressure to prevent it. BMC and Luna G3 machines are available at a lower price point and produce equivalent therapy outcomes for most patients. The trade-offs are in data format (proprietary vs open), noise level, and build quality. CPAP Clarity gives you the same data analysis depth regardless of which brand you use.

Should I avoid Philips because of the recall?

The 2021 recall affected the DreamStation 1, not the DreamStation 2. The DreamStation 2 was designed without the problematic foam and has not been subject to any recall. If your provider recommends a DreamStation 2, the hardware is safe. The more relevant consideration for data-focused users is that Philips' data format is less open than ResMed's, and CPAP Clarity does not currently support it.

Can CPAP Clarity read data from all these machines?

CPAP Clarity supports ResMed (AirSense 10, AirSense 11, AirCurve 10, AirCurve 11 ASV, AirCurve 11 VAuto), BMC (E-20A, G3 A20), React Health Luna G3, and Lowenstein Prisma Smart. Philips DreamStation data is not currently supported. For the full list, see our supported devices page. All processing happens in your browser. Your health data never leaves your device.

Where can I find a more detailed review of my specific machine?

We have dedicated review articles for each supported brand: ResMed AirSense 11 vs 10, AirCurve 11 ASV, AirCurve 10 VAuto, BMC E-20A, BMC G3 A20, Luna G3, and Lowenstein Prisma Smart. For pricing and where to buy, see our best CPAP machines in 2026 guide.

Primary Sources

• ResMed AirSense 11 product page (opens in new tab): manufacturer specifications including noise level, connectivity, and AutoSet algorithm
• SD Association: SD/SDHC/SDXC/SDUC Capacity (opens in new tab): defines SDHC as 2GB to 32GB with FAT32 filesystem (universal across all CPAP brands)
• FDA: Recalled Philips Ventilators, BiPAP Machines, and CPAP Machines (opens in new tab): FDA hub page for the June 2021 Class I recall of PE-PUR foam devices (DreamStation 1; does not apply to DreamStation 2)

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