# CPAP Machine Comparison (5 Brands, 2026)

Side-by-side comparison of every major CPAP brand: ResMed, BMC, Luna G3, Lowenstein, and Philips. Algorithms, data access, noise, and accessories.

Source: https://cpapclarity.com/learn/cpap-machine-comparison
Published: 2026-05-27
Updated: 2026-09-20
Author: Brian C.

Informational, not medical advice. Talk to your sleep physician before changing your therapy, pressure, mask, or medications.

**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** | 25 dBA (27 with humidifier) | Moderate | 28 dBA | 26 dBA (27.5 with humidifier) | 27 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 | prisma APP | DreamMapper |
| **CPAP Clarity support** | Full | Full | Full | Full | Full |
| **Pressure relief** | EPR (3 levels) | EPR-equivalent | EPR-equivalent | SoftPAP (3 levels) | Flex / Flex+ |
| **Market** | Global | Global (budget segment) | North America | Europe (primarily) | Global (no new US sales under the FDA consent decree) |

Each noise figure is the manufacturer's own published sound pressure level, and the basis differs by brand, so read the qualifier rather than the bare number. The 26.6 dBA figure widely quoted for ResMed machines is not in either user guide; it comes from retailer marketing, so this table does not use it. React Health publishes two different numbers for the Luna G3 at the same pressure, under 26 dBA on its sales brochure and 28 dBA in the user manual that carries the measurement standard. This table uses the manual, for the same reason it declines the ResMed marketing figure.

All five machines use a standard full-size SD card (32GB max, FAT32). See our [SD card buyer's guide](https://cpapclarity.com/learn/best-sd-card-for-cpap) 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](https://cpapclarity.com/learn/cpap-pressure-settings). ResMed also offers [EPR (Expiratory Pressure Relief)](https://cpapclarity.com/learn/understanding-epr) 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; the [BMC page](https://cpapclarity.com/for/bmc) covers what CPAP Clarity reads from each). 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 the [BMC E-20A and G3 A20 data guide](https://cpapclarity.com/learn/bmc-cpap-data-guide) or the [Luna G3 review](https://cpapclarity.com/learn/luna-g3-cpap-review) for details on each. Yuwell machines sit outside this table because OSCAR cannot read them at all; the [Yuwell page](https://cpapclarity.com/for/yuwell) explains what CPAP Clarity does with that card instead. If you are still choosing between brands rather than reading a machine you already own, the [machine finder](https://cpapclarity.com/tools/machine-finder) narrows it by what matters to you.

**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](https://cpapclarity.com/learn/lowenstein-prisma-smart-cpap-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](https://cpapclarity.com/learn/treatment-emergent-central-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](https://cpapclarity.com/) 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 tools are tied to the Lowenstein ecosystem: prismaTS is desktop software for clinicians, and the patient-facing prisma APP shows a nightly summary rather than the full record. 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, and the files are encrypted. Philips' DreamMapper app provides AHI, usage hours, and leak status, similar to myAir's simplified view. CPAP Clarity reads both the DreamStation 2 (decrypting its encrypted card) and the original DreamStation, showing the full nightly detail: AHI breakdown, pressure, and leak trends.

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, Lowenstein, and Philips are all proprietary but fully readable through CPAP Clarity.

## 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 recalled. It is not clear of FDA attention, though. In November 2023 the FDA issued a safety communication asking patients and providers to carefully monitor DreamStation 2 machines for signs of overheating, after reports of fire, smoke and burns. There is also a second, much narrower Class I recall on the DreamStation 1 side, covering about 1,100 reworked replacement units shipped in the US between December 2021 and October 2022 that were programmed with incorrect or duplicate serial numbers, which could make them run the wrong prescription. If you received a remediated machine in that window, it is worth checking with Philips. If you still own and use an original DreamStation, our [Philips DreamStation data guide](https://cpapclarity.com/learn/philips-dreamstation-data-guide) covers what the machine records and how to read it.

ResMed, BMC, React Health (Luna G3), and Lowenstein have no recall history on their current-generation CPAP machines. ResMed masks are a separate story: ResMed recalled all of its CPAP masks with magnets, which the FDA identified as a Class I recall, because the magnets can interfere with certain implanted medical devices. 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 on the machine itself matters to you, ResMed's is the longest. If you're considering a DreamStation 2, the foam issue does not apply to that model, though in the US Philips is not selling new CPAP or BiPAP machines until it meets the requirements of its FDA consent decree.

## 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 Filters (30-pack)** (ResMed AirSense 11 / AirCurve 11): Standard disposable filters for AirSense 11 and AirCurve 11 machines. Replace every 30 days.
- **ResMed AirSense 10 Filters (30-pack)** (ResMed AirSense 10 / AirCurve 10): Standard disposable filters for AirSense 10 and AirCurve 10 machines. Replace every 30 days.
- **Luna G3 Filters (60-pack)** (React Health Luna G3): Compatible disposable filters for React Health Luna G3 machines. Third-party, not OEM.

**BMC E-20A / G3 A20 and Lowenstein Prisma Smart filters** use the same 30-day cadence, but there is no well-reviewed third-party filter for either machine in US retail. Source them through your DME supplier or the manufacturer to be sure you get the correct form factor.

### 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 HumidAir Water Chamber** (ResMed AirSense 10 / AirCurve 10): Genuine ResMed HumidAir chamber for AirSense 10 and AirCurve 10. Replace every 6 months.
- **AirSense 11 Compatible Water Chamber** (ResMed AirSense 11 / AirCurve 11): Compatible water chamber for AirSense 11 and AirCurve 11 machines; includes a 20-pack of disposable filters.
- **Distilled Water for CPAP** (All Brands): Distilled water for any CPAP humidifier. Prevents mineral buildup that damages the chamber. Grocery stores carry it cheapest; this is the online option.

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, 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](https://cpapclarity.com/learn/best-sd-card-for-cpap) for picks and reader recommendations.

For a full replacement schedule covering filters, tubing, mask cushions, and more, see our [CPAP supply replacement guide](https://cpapclarity.com/learn/cpap-supply-replacement-schedule).

## 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](https://cpapclarity.com/learn/glossary#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](https://cpapclarity.com/learn/cpap-mask-types-guide) for help choosing.

**Which CPAP is quietest?**

They are closely matched. ResMed's user guides put the AirSense 11 at 25 dBA without the humidifier tub and 27 dBA with it, both plus or minus 2 dBA. React Health's Luna G3 user manual gives 28 dBA plus or minus 2 (its sales brochure claims under 26 at the same pressure, and we use the manual), Lowenstein publishes 26 dBA for the Prisma Smart (27.5 with its humidifier), and Philips publishes 27 dBA for the DreamStation 2. 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 recalled. It is not free of FDA safety notices, though: in November 2023 the FDA asked patients and providers to carefully monitor DreamStation 2 machines for signs of overheating. If your provider recommends a DreamStation 2, the foam issue is not a reason to turn it down, but it is worth asking them about the overheating reports. For data-focused users, Philips' format is less open than ResMed's (the DreamStation 2 even encrypts its card), but CPAP Clarity reads both the DreamStation 2 and the original DreamStation. On the DreamStation 2 our night-by-night gate is still formally open, so read its 95th-percentile pressure as close rather than confirmed; the usage, the night count and the event counts match OSCAR exactly.

**Can CPAP Clarity read data from all these machines?**

Yes, all five brands compared here: ResMed (AirSense and AirCurve lines, plus older and travel models), BMC (E-20A, G3 A20), React Health Luna G3, Lowenstein Prisma Smart, and Philips (DreamStation and DreamStation 2). For the current full device list, see the [home page](https://cpapclarity.com/). 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](https://cpapclarity.com/learn/airsense-11-vs-10), [AirCurve 11 ASV](https://cpapclarity.com/learn/aircurve-11-asv-cpap-review), [AirCurve 10 VAuto](https://cpapclarity.com/learn/aircurve10-vauto-data-guide), [BMC E-20A and G3 A20](https://cpapclarity.com/learn/bmc-cpap-data-guide), [Luna G3](https://cpapclarity.com/learn/luna-g3-cpap-review), and [Lowenstein Prisma Smart](https://cpapclarity.com/learn/lowenstein-prisma-smart-cpap-review). For pricing and where to buy, see our [best CPAP machines in 2026](https://cpapclarity.com/learn/best-cpap-machines-2026) guide. And if you are curious which machines people actually use, our [CPAP data statistics](https://cpapclarity.com/learn/cpap-user-data-statistics) page counts real imports.

## Primary Sources

- [ResMed AirSense 11 user guide](https://document.resmed.com/documents/products/machine/airsense-11/user-guide/airsense11_user-guide_amer_mul.pdf): sound pressure level 25 dBA with the side cover and 27 dBA with the HumidAir 11 tub, each plus or minus 2 dBA, measured to ISO 80601-2-70:2015 in CPAP mode
- [ResMed AirSense 10 user guide](https://document.resmed.com/documents/products/machine/airsense-series/user-guide/airsense-10-device-with-humidifier_user-guide_amer_eng.pdf): the same pair of figures as the AirSense 11, 25 dBA on SlimLine or Standard tubing and 27 dBA with humidification, each plus or minus 2 dBA, to the same standard; weight 1248 g with the standard water tub
- [Löwenstein prisma SMART / prisma SOFT user manual](https://loewensteinmedical.com/media/user_upload/pdf/gebrauchsanweisung/prisma-SMART-SOFT-sleep-therapy-user-manual-EN-65601.pdf): medium sound pressure level approx. 26 dB(A), approx. 27.5 dB(A) with the humidifier; weight 1.2 kg
- [Philips DreamStation 2 Advanced user manual](https://www.philips.com/c-dam/b2bhc/master/landing-pages/src/update/replacement-devices/dreamstation-2/en-us/philips-dreamstation-2-advanced-user-manual.pdf): sound pressure level 27 dB(A) with an uncertainty of 2 dB(A)
- [React Health Luna G3 APAP / CPAP user manual](https://www.reacthealth.com/uploads/userfiles/files/documents/Luna%20G3%20CPAP%20APAP%20User%20Manual%20V1_7-%204_30_24.pdf): A-weighted sound pressure level 28 dB(A) with an uncertainty of 2 dB(A) at 10 hPa, declared to ISO 4871:1996; weight 1.7 kg (3.75 lbs). React Health's own sales brochure (MI.MK.0204.REV.D) states sound under 26 dBA at 10 cmH2O, a pressure about 2 percent above the manual's 10 hPa, which does not account for a 2 dBA gap. The manual's figure is the one this article uses
- [SD Association: SD/SDHC/SDXC/SDUC Capacity](https://www.sdcard.org/developers/sd-standard-overview/capacity-sd-sdhc-sdxc-sduc/): defines SDHC as 2GB to 32GB with FAT32 filesystem (universal across all CPAP brands)
- [FDA: Recalled Philips Ventilators, BiPAP Machines, and CPAP Machines](https://www.fda.gov/medical-devices/respiratory-devices/recalled-philips-ventilators-bipap-machines-and-cpap-machines): FDA hub page for the June 2021 Class I recall of PE-PUR foam devices (DreamStation 1; does not apply to DreamStation 2)
- [FDA safety communication: Carefully Monitor Philips DreamStation 2 CPAP Machines for Signs of Overheating](https://www.fda.gov/medical-devices/safety-communications/carefully-monitor-philips-dreamstation-2-cpap-machines-signs-overheating-fda-safety-communication) (November 28, 2023): source for the overheating reports, which are a safety communication and not a recall
- [FDA: Philips Respironics Recalls Certain Reworked DreamStation CPAP, BiPAP Machines](https://www.fda.gov/medical-devices/medical-device-recalls-and-early-alerts/philips-respironics-recalls-certain-reworked-dreamstation-cpap-bipap-machines-risk-they-may-deliver): Class I recall initiated February 10, 2023, covering 1,088 reworked US units with incorrect or duplicate serial numbers
- [FDA: ResMed Ltd. Recalls CPAP Masks with Magnets](https://www.fda.gov/medical-devices/medical-device-recalls-and-early-alerts/resmed-ltd-recalls-continuous-positive-airway-pressure-cpap-masks-magnets-due-possible-magnetic): Class I recall initiated November 20, 2023, for possible magnetic interference with certain implanted medical devices
- [Philips: Explained, the Philips Respironics consent decree](https://www.philips.com/a-w/about/patient-safety-and-quality/explained-philips-respironics-consent-decree.html): source for Philips not resuming US sales of new CPAP or BiPAP machines until the agreement's requirements are met