Belun Sleep System BLS-100 vs NightOwl Home Sleep Apnea Test - Clinical Comparison

Name: NightOwl Home Sleep Apnea Test
Brand: ResMed
Price: 99 USD
Rating: 93

Compare Belun Sleep System BLS-100 and NightOwl Home Sleep Apnea Test side-by-side with clinical performance scores, FDA status, pricing, and expert recommendations

Select First Device

Select Second Device

Belun Sleep System BLS-100

90 /100

NightOwl Home Sleep Apnea Test

93 /100

+3% higher overall score

Belun Sleep System BLS-100

Belun Technology

Score

Price

$129

Evidence

Strong

Buy Now Full Review

Top Rated

NightOwl Home Sleep Apnea Test

ResMed

Score

Price

$99

Evidence

Strong

Buy Now Full Review

Performance Metrics

Belun Sleep System BLS-100

NightOwl Home Sleep Apnea Test

Performance Metrics

Belun Sleep System BLS-100

NightOwl Home Sleep Apnea Test

Diagnostic Accuracy

Measures how closely the device's diagnostic metrics match clinical gold standards.

Maintains high sensitivity (0.85-0.92) for moderate-to-severe OSA diagnosis across diverse populations.

NightOwl demonstrates a strong Pearson correlation (approx. 0.90) with PSG-derived AHI, maintaining consistent accuracy across both 3% and 4% desaturation rules.

+4% better diagnostic accuracy

Diagnostic Accuracy

Measures how closely the device's diagnostic metrics match clinical gold standards.

+4% better

Ease of Use

Evaluates the simplicity of setup and sensor application for the user.

The cableless, one-finger application is highly intuitive; 100% of patients in trials completed the test without professional assistance.

Setup is remarkably simple; the user only needs to apply a small fingertip sticker and follow the guided instructions in the smartphone app.

Ease of Use

Evaluates the simplicity of setup and sensor application for the user.

Wearing Comfort

Assesses non-invasiveness and sleep disruption.

At just 13g, the medical-grade ring causes negligible sleep disturbance compared to traditional chest belts or nasal cannulas.

+1% better wearing comfort

As a 'probeless' PAT device without nasal cannulas or chest straps, it offers the highest level of wearing comfort in the HSAT category.

Wearing Comfort

Assesses non-invasiveness and sleep disruption.

+1% better

Value for Money

Considers the diagnostic depth relative to the device and subscription costs.

While clinically superior, the requirement for an active monthly subscription for AI-scoring increases long-term costs for practitioners.

While more expensive than consumer oximeters, its clinical diagnostic status and inclusion of multi-night data provide exceptional value for definitive OSA diagnosis.

+8% better value for money

Value for Money

Considers the diagnostic depth relative to the device and subscription costs.

+8% better

Clinical Efficacy

Belun Sleep System BLS-100

NightOwl Home Sleep Apnea Test

Clinical Efficacy

Belun Sleep System BLS-100

NightOwl Home Sleep Apnea Test

AHI Detection Accuracy

Ability to accurately count apnea and hypopnea events per hour.

Clinical meta-analysis shows excellent specificity (0.95) for severe OSA, though it may underestimate mild cases.

Proprietary machine learning algorithms successfully filter signal noise to identify vasoconstriction events indicative of respiratory disturbances.

+5% better ahi detection accuracy

AHI Detection Accuracy

Ability to accurately count apnea and hypopnea events per hour.

+5% better

Sleep Stage Identification

Accuracy in identifying REM and NREM states.

AI-driven bSTAGES achieved 90% accuracy for REM detection and 82% for NREM, outperforming many non-EEG wearables.

+4% better sleep stage identification

Uses actigraphy and autonomic markers from the PAT signal to estimate sleep architecture, providing more context than total recording time alone.

Sleep Stage Identification

Accuracy in identifying REM and NREM states.

+4% better

Respiratory Event Detection

Sensitivity in identifying specific respiratory obstructions and effort.

Extracts respiratory event indices (Ring-REI) from a combination of HRV, SpO2, and PPG amplitude changes.

Effectively identifies sympathetic activation events associated with the termination of respiratory obstructions.

+5% better respiratory event detection

Respiratory Event Detection

Sensitivity in identifying specific respiratory obstructions and effort.

+5% better

In-Lab PSG Correlation

Statistical alignment with gold-standard hospital studies.

Validation studies report a very strong correlation with PSG total sleep time (r = 0.945).

Validated in multi-center trials as an adequate replacement for PSG in patients with high pretest probability of Obstructive Sleep Apnea.

+3% better in-lab psg correlation

In-Lab PSG Correlation

Statistical alignment with gold-standard hospital studies.

+3% better

Specifications

Specification	Belun Sleep System BLS-100	NightOwl Home Sleep Apnea Test
Price	$129	$99
FDA Status	FDA 510(k) Cleared	FDA 510(k) Cleared
Clinical Evidence	Strong Clinical Evidence	Strong Clinical Evidence
Clinical Recommendation	Recommended	Highly Recommended
Connectivity	bluetooth	bluetooth

Value for Money

90 score / $129

69.8

value score

93 score / $99

93.9

value score

35% better value

Value score = Performance score ÷ Price × 100

Belun Sleep System BLS-100

Strengths

✓ First FDA-cleared ring-style HST with AI-powered diagnostics
✓ High-resolution (200 Hz) PPG signal for medical-grade accuracy
✓ Clinically validated sleep architecture (Wake/REM/NREM)
✓ Cableless design eliminates sleep disruption from tubes or wires
✓ Supports multi-night analysis for longitudinal OSA monitoring

Limitations

× Requires active monthly subscription for automated AI-scoring reports
× Limited specificity in differentiating very mild OSA (AHI < 5)
× Requires specific ring sizing for optimal signal quality on the index finger

NightOwl Home Sleep Apnea Test

Strengths

✓ The smallest and most discrete home sleep apnea test on the market.
✓ Multi-night recording capability (up to 10 nights) provides higher diagnostic confidence.
✓ No nasal cannula or chest belts, allowing for natural sleep patterns.
✓ Seamless integration with ResMed's clinical ecosystem (Somnoware/myAir).
✓ Fully disposable design eliminates the need for cleaning or device returns.

Limitations

× Mandatory smartphone requirement; not suitable for users without compatible devices.
× Not indicated for central sleep apnea or complex cardiovascular comorbidities.
× Limited ability to detect non-respiratory sleep disorders like RLS or parasomnias.

Expert Review Summary

Our clinical assessment and verdict for each device

Belun Sleep System BLS-100

Recommended

"A breakthrough medical wearable that distills laboratory-grade sleep staging and apnea detection into a compact, cableless ring."

The Belun Ring (BLS-100) represents a significant evolution in home sleep apnea testing (HSAT), moving away from bulky sensors toward a minimalist ring form factor. As the first FDA-cleared AI-powered wearable of its kind, it captures high-resolution photoplethysmography (PPG) at 200 Hz, alongside 3-axis accelerometry and pulse oximetry. This dense data stream allows its proprietary deep-learning algorithms to not only identify respiratory events but also categorize sleep stages (Wake, NREM, REM) with high accuracy. Clinical evaluations demonstrate a strong correlation with gold-standard polysomnography (PSG) for both AHI (r = 0.89) and total sleep time (r = 0.94). One of its most compelling clinical advantages is the support for multi-night testing, which averages out night-to-night variability and reduces the 'first-night effect' often seen in clinical labs.

Strong Clinical Evidence

Read Full Review

NightOwl Home Sleep Apnea Test

Highly Recommended

"The most compact and non-invasive diagnostic sleep test available, offering the unique advantage of multi-night testing in a disposable format."

NightOwl, developed by Ectosense and acquired by ResMed, is currently the world's smallest FDA-cleared home sleep apnea test (HSAT). Measuring roughly the size of a fingertip, the sensor is applied via a simple adhesive patch and communicates directly with a smartphone app. Unlike traditional Type III tests that require chest belts and nasal cannulas, NightOwl utilizes Peripheral Arterial Tone (PAT) technology combined with actigraphy and advanced photoplethysmography (PPG). This combination allows it to derive accurate respiratory event indices (REI) and total sleep time (TST). Its most significant clinical advantage is the ability to record for up to 10 nights, allowing clinicians to capture night-to-night variability and avoid misdiagnosis based on a single 'off' night. Our clinical assessment confirms its high correlation with gold-standard polysomnography (PSG), particularly in its 4% hypopnea desaturation scoring accuracy.

Strong Clinical Evidence

Read Full Review

Where to Buy

Verified purchase options and current availability

Belun Sleep System BLS-100

$129 MSRP

MiniHST

$299.00

Ships in less than one business day Hardware only; clinical analysis services may require a separate provider.

Shop

O2 Healthcare Group

$388.00

Contact via WhatsApp for appointment Full diagnostic package including 2-night study, specialist reviews, and CPAP prescription if needed.

Shop

Manufacturer Site

HSA/FSA: Usually Eligible

NightOwl Home Sleep Apnea Test

Top Choice

$99 MSRP

Sleeplay

$99.00

Ships same day if placed by 2PM EST Prescription consultation available; FSA/HSA eligible.

Shop

HomeSleepHealth

$90.00

Standard ground shipping included Includes initial telehealth consultation and 2 nights of testing.

Shop

Manufacturer Site

HSA/FSA: Usually Eligible

Important Purchase Considerations

• Prices shown are current as of the last update and may vary. Always verify pricing at the retailer's website.
• Some medical devices may require a prescription. Check with your healthcare provider before purchasing.
• Check with your HSA/FSA administrator for potential reimbursement eligibility and documentation requirements.
• Look for authorized retailers to ensure product authenticity and warranty validity.