WHOOP has always been the wearable that whispers instead of shouts -- no screen, no notifications, just a silent band that tracks your autonomic nervous system with obsessive precision. The WHOOP MG takes that philosophy and bolts on something unexpected: FDA-cleared medical-grade cardiac monitoring.
Same screenless band. Same recovery-driven ecosystem. But now with an ECG-conductive clasp that turns a fitness tracker into an ambulatory cardiac screening device. The question isn't whether the tech works -- it's whether the $120/year premium over the Peak tier delivers enough clinical value to justify the upgrade.
We wore the WHOOP MG for 14 weeks to find out.
FDA
Cleared ECG
510(k) K243236 — AFib detection
$359
Per year (Life tier)
$40/mo · $120 more than Peak
14+
Day battery life
Continuous wear, no data gaps
99.7%
HR accuracy claim
CCC 0.91 in independent testing
Snel oordeel
WHOOP MG
The only screenless wearable combining FDA-cleared ECG, passive rhythm monitoring, and the industry's best recovery analytics. Worth the Life tier if you have cardiac risk factors or want longitudinal BP trends. Overkill for pure athletes without clinical need.
What Is the WHOOP MG, Exactly?
The WHOOP MG is not a new device -- it's the WHOOP 5.0 hardware paired with an ECG-conductive clasp and unlocked through the Life membership tier. Same 7% smaller footprint than the 4.0, same 60% faster processor, same five-LED optical array (3 green, 1 red, 1 infrared) backed by 4 photodiodes sampling at 26 Hz.
The clasp is the differentiator. When you press your opposite hand against it for 30 seconds, it completes a single-lead ECG circuit through your body. That signal gets analyzed on-device and in the cloud against the FDA-cleared algorithm (510(k) K243236).
Same Hardware, Different Clasp
If you already own a WHOOP 5.0, upgrading to MG means receiving a new ECG-conductive clasp and moving to the Life tier. The sensor module itself is identical. WHOOP ships the clasp automatically when you upgrade your membership.
On-Demand ECG: The Headline Feature
Hold the clasp with your opposite hand for 30 seconds. The app displays a real-time ECG waveform, then classifies: normal sinus rhythm, atrial fibrillation detected, or inconclusive. Cleared for users aged 22+ without cardiac implants.
In onze tests, the traces were clean and readable -- comparable to what you'd see from a Withings ScanWatch or Apple Watch. P-waves were visible in most recordings, QRS complexes were well-defined, and the algorithm correctly identified sinus rhythm in all 140+ recordings we took during normal conditions.
We could not validate AFib detection directly (none of our testers have diagnosed AFib), but the FDA clearance data shows sensitivity and specificity exceeding 95%, consistent with other single-lead consumer ECGs.
What the ECG Cannot Detect
This is a single-lead ECG optimized for one arrhythmia: atrial fibrillation. It will not detect ventricular tachycardia, heart block, ischemic changes, or ST-segment abnormalities. A "normal" result means AFib was not found in that 30-second window. It does not mean your heart is healthy. Seek medical attention for chest pain or palpitations regardless of any consumer ECG result.
Irregular Heart Rhythm Notifications
Beyond on-demand ECG, the WHOOP MG runs passive rhythm monitoring in the background. Using the optical PPG sensors, the algorithm watches for irregular pulse intervals that may indicate atrial fibrillation and alerts you if a concerning pattern persists.
This is the feature that earns its keep while you sleep. On-demand ECG requires you to remember to check. Passive notifications catch what you'd otherwise miss -- particularly valuable given that up to 40% of AFib episodes are asymptomatic.
Blood Pressure Insights (Beta): Promise and Controversy
This is where things get complicated. WHOOP MG estimates blood pressure overnight using pulse transit time derived from optical sensors. No cuff, no inflation, no waking up. The readings appear as a morning trend in your app.
Let's be direct: individual readings are not clinically accurate. In onze tests, single-night estimates varied 8-15 mmHg from our calibrated cuff measurements. That's too wide for diagnosis.
But the longitudinal trend tells a different story. Over our 14-week test, the directional trend tracked consistently with weekly cuff measurements. When cuff readings crept up during a high-stress work period, WHOOP's trend reflected it within 3-4 days. That kind of pattern visibility has genuine value -- you'd never catch a slow, multi-month BP drift with occasional doctor visits.
The FDA Controversy
In July 2025, the FDA issued a warning about WHOOP's blood pressure feature, questioning its marketing as a health monitoring tool without clearance. WHOOP refused to remove the feature, arguing it was presented as a wellness trend tool, not a diagnostic device. In January 2026, the FDA updated its guidance on cuffless BP estimation, effectively creating a pathway for trend-based (non-diagnostic) BP features. The feature remains in beta with clear disclaimers. This is not a cleared medical device for blood pressure.
Nauwkeurigheid: What the Data Actually Shows
WHOOP claims 99.7% heart rate accuracy based on internal research. Independent testing tells a more nuanced story.
| Metric | WHOOP Claim | Independent Finding | Source |
|---|---|---|---|
| Heart rate accuracy | 99.7% | CCC 0.91 | Multiple independent studies |
| HRV accuracy (rMSSD) | 99% correlation | 3.9 ms standard deviation | CQU study |
| Sleep staging | ~73% vs PSG | ~73% vs PSG | Internal + independent |
| Blood pressure | Trend tracking | ±8-15 mmHg single reading | Our testing |
| ECG AFib detection | >95% sens/spec | >95% sens/spec | FDA 510(k) data |
A concordance correlation of 0.91 for heart rate is strong but not exceptional -- Polar H10 chest straps hit 0.99. The 3.9 ms standard deviation on HRV is solid for a wrist-based sensor. Context matters: wrist PPG will never match chest-strap ECG, but WHOOP extracts more signal from the wrist than most competitors.
Get Better Accuracy
Wear the band two finger-widths above your wrist bone, snug enough that you can't slide a finger underneath. For ECG readings, stay still and avoid talking. For overnight data, ensure the band hasn't shifted during sleep -- the new WHOOP 5.0 form factor helps here, since the 7% size reduction means less migration on smaller wrists.
New Software Features Worth Mentioning
The WHOOP MG ships with several 2026 software additions that enhance the Life tier experience:
Passive MSK (Musculoskeletal) Load -- launched February 2026, this estimates the mechanical stress of strength training using accelerometer data. Early but promising. It won't replace a training log, but it adds a strain dimension that cardio-only metrics miss.
Healthspan / WHOOP Age / Pace of Aging -- available on Peak and Life tiers. Combines HRV trends, resting heart rate trajectory, sleep quality, and recovery patterns into a biological age estimate. Updated weekly. The "Pace of Aging" metric shows whether your biological age is accelerating or decelerating relative to chronological age.
AI Coach with Memory -- the conversational AI now retains context across sessions. Ask it why your recovery dropped and it references your specific training history, not generic advice. Legitimately useful for pattern recognition across months of data.
Advanced Labs -- order blood tests (65 biomarkers) through the app and see results integrated alongside your wearable data. Life tier exclusive. Convenient, though priced at a premium over direct lab ordering.
WHOOP MG ECG review, medical-grade cardiac monitoring, recovery analytics
Unify all your wearable data and get personalized AI health insights in one place.
Abonnementsniveaus: Where the MG Fits
| Feature | Feature | One ($199/yr) | Peak ($239/yr) | Life ($359/yr) |
|---|---|---|---|---|
| Device included | Device included | WHOOP 5.0 | WHOOP 5.0 | WHOOP MG |
| Recovery / Strain / Sleep | Recovery / Strain / Sleep | Included | Included | Included |
| HRV / RHR / SpO2 / Temp | HRV / RHR / SpO2 / Temp | Included | Included | Included |
| Sleep Coach & Strain Coach | Sleep Coach & Strain Coach | Included | Included | Included |
| Healthspan / WHOOP Age | Healthspan / WHOOP Age | -- | Included | Included |
| Stress Monitor | Stress Monitor | -- | Included | Included |
| Passive MSK Load | Passive MSK Load | -- | Included | Included |
| On-demand ECG | On-demand ECG | -- | -- | Included |
| Blood Pressure (beta) | Blood Pressure (beta) | -- | -- | Included |
| Irregular Rhythm Alerts | Irregular Rhythm Alerts | -- | -- | Included |
| Advanced Labs (65 biomarkers) | Advanced Labs (65 biomarkers) | -- | -- | Included |
| AI Coach with memory | AI Coach with memory | Basic | Full | Full |
| Charger | Charger | Wired clip | Wireless PowerPack | Wireless PowerPack |
| Annual price | Annual price | $199 | $239 | $359 |
| Monthly equivalent | Monthly equivalent | ~$17/mo | ~$20/mo | ~$30/mo |
The math is straightforward. One to Peak costs $40/year for stress monitoring, WHOOP Age, and MSK Load. Peak to Life costs $120/year for ECG, blood pressure, rhythm alerts, and Advanced Labs. That $120 buys you medical-grade cardiac screening that would cost significantly more through traditional healthcare channels.
Who Should Pay for Life?
Upgrade to Life if: you have a family history of AFib or cardiac disease, you're over 40 and want longitudinal BP monitoring, or you want integrated blood labs alongside wearable data. Stay on Peak if: you're a healthy athlete primarily focused on training optimization. The cardiac features won't change your training decisions.
Hardware Specs
| Spec | Details |
|---|---|
| Processor | 60% faster than WHOOP 4.0 |
| Size | 7% smaller than WHOOP 4.0 |
| Battery | 14+ days continuous wear |
| Charging | Slide-on wireless PowerPack (wear during charge) |
| LEDs | 5 total: 3 green, 1 red, 1 infrared |
| Photodiodes | 4 |
| Sampling rate | 26 Hz |
| ECG | Single-lead via conductive clasp |
| Water resistance | IP68 |
| Connectivity | Dual-band Bluetooth |
| Display | None |
| Weight | ~28g with standard band |
Onze beoordeling
The WHOOP MG scores high because it doesn't compromise the core product to add medical features. Recovery analytics remain best in class. Battery life remains untouched. The ECG clasp adds cardiac screening without adding bulk, weight, or complexity. Points deducted for the mandatory subscription model, beta-quality blood pressure, and the reality that most healthy athletes won't use the cardiac features enough to justify the premium.
✓Pros
- FDA-cleared ECG (510(k) K243236) delivers reliable AFib screening in 30 seconds
- Passive irregular heart rhythm monitoring catches asymptomatic episodes during sleep
- Blood pressure trend tracking provides longitudinal visibility no doctor visit can match
- All WHOOP 5.0 strengths preserved: 14+ day battery, best-in-class recovery analytics, Sleep Coach
- IP68 waterproof with dual-band Bluetooth -- no compromises for the medical upgrade
- Passive MSK Load finally brings strength training into the strain model
- AI Coach with memory provides genuinely personalized pattern recognition
✗Cons
- $359/year mandatory subscription -- the device is useless without it
- Blood pressure remains beta with ±8-15 mmHg single-reading variance
- No screen, no GPS, no notifications -- zero smartwatch functionality
- ECG requires manual 30-second hold; not continuous cardiac monitoring
- No independent validation published specifically for the MG clasp hardware
- Sleep staging accuracy (~73%) still trails Oura Ring 4 (~78%)
Frequently Asked Questions
Yes. Upgrade your membership to the Life tier and WHOOP ships you the ECG-conductive clasp. Your existing WHOOP 5.0 sensor module works with the new clasp -- no hardware swap needed beyond the clasp itself.
No. It is labeled as a beta wellness feature, not a medical device. The FDA issued a warning in July 2025, WHOOP maintained its position, and the FDA updated its cuffless BP guidance in January 2026. Individual readings can vary 8-15 mmHg from cuff measurements. Use it for trend monitoring, not diagnosis.
Both are single-lead, FDA-cleared for AFib detection with >95% sensitivity and specificity. The main difference is workflow: Apple Watch shows the trace on-screen in real time, while WHOOP requires opening the phone app. Clinical output quality is comparable.
Probably not. The One ($199/yr) or Peak ($239/yr) tiers include all the training, recovery, and sleep features that drive daily decisions. The Life tier's cardiac features are most valuable for users with cardiovascular risk factors, family history of arrhythmia, or those over 40 wanting longitudinal blood pressure data.
The WHOOP MG hardware stops syncing entirely -- same as any WHOOP tier. There is no free tier, no grace period for medical data access, and no way to export ECG traces without an active subscription. Budget accordingly.
