Dexcom Stelo vs WHOOP 5.0
Two devices, the same questions: what does it actually measure, how good is the data, what does it cost to keep using, and who is it for.
Dexcom Stelo
The first over-the-counter continuous glucose monitor in the US. A 15-day skin-worn sensor that turns a black-box variable — your glucose response to food, stress and sleep — into a graph you can act on.
Full review →WHOOP 5.0
A screen-free recovery band that is really a subscription service. The hardware is a delivery mechanism for daily strain, recovery and sleep analytics that lean athletic.
Full review →| Spec | Dexcom Stelo | WHOOP 5.0 |
|---|---|---|
| Price | Not sold in the UK — Abbott Lingo is the equivalent here, around £120/month | No upfront hardware cost — membership from roughly £229/year |
| Subscription | None (device is single-use) | Required (hardware is free with membership) |
| Form factor | Skin-worn sensor, upper arm, 15 days per sensor | Fabric band, 24/7 wear, no screen |
| Battery life | Sensor lifespan 15 days | 14 days (5.0) |
| Water resistance | Yes (shower/swim) | 10 m |
| Platforms | iOS, Android | Same |
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| Metrics tracked |
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| Data quality | MARD (mean absolute relative difference) in the ~10% range vs venous blood glucose — best-in-class for consumer CGM. Interstitial lag makes rapid spikes appear ~5 minutes late. | HR accuracy at rest and low intensity is strong; less reliable during heavy weightlifting or intervals where PPG is confounded by muscle contraction. Sleep-stage agreement is comparable to leading rings. |
| Ecosystem | Native Stelo app; data export to Apple Health and Google Health Connect. Third-party integrations via Dexcom API and platforms like Levels, Nutrisense and Signos. | First-party WHOOP app, Strava sync, Apple Health / Google Health Connect exports, growing team and coach features. |
| Privacy | Glucose data stored in Dexcom cloud; can be exported as CSV. HIPAA-aligned handling. | Data stored on WHOOP servers; users can export CSVs and delete accounts. Membership fees fund infrastructure, not data resale. |
Dexcom Stelo
- Otc — no prescription needed for non-diabetics in the US
- 15-day wear, waterproof, minimally invasive
- Turns diet and exercise into an immediate feedback loop
- Best-in-class sensor accuracy in the CGM space
- Not intended for insulin-dependent diabetics (see G7 for that)
- 15-minute readings vs 1-minute on G7 — smoother, less real-time
- Interstitial fluid lags blood glucose by 5–10 minutes
- Metabolic-optimisation users identifying personal glycaemic responses
- Anyone with pre-diabetes or a family history of type 2 diabetes
- People chasing zone-2 fitness or GLP-1 protocol optimisation
- Type 1 diabetics needing dosing decisions from the device
- Users unwilling to wear a visible sensor on the arm
WHOOP 5.0
- Coherent recovery ↔ strain ↔ sleep loop that changes behaviour
- Excellent sleep and HRV trend data
- Wearable in the shower, gym, bed — very high adherence
- Journal correlation surfaces personal patterns (alcohol, late meals, etc.)
- You do not own the data pipeline — cancel the subscription, lose the app
- No screen; you cannot glance at HR mid-workout
- GPS piggy-backs off your phone
- Athletes who train hard and need objective recovery guidance
- Users who want automatic behaviour correlation instead of manual analysis
- Anyone who wants to own a device and avoid recurring cost
- Users who need a smartwatch's notifications and screen
The lowest-friction way to turn glucose into an actionable metric. Non-diabetics should treat it as a 15–30 day learning tool, not a permanent wear.
Best for athletes who want a coach in a band. Not for users who prefer a screen or resent subscriptions.
Other comparisons
Scores reflect our own testing criteria — data quality, what the device measures that matters for healthspan, and total cost of ownership including subscription. Prices are manufacturer list prices and change often; check before buying. Some links are affiliate links, which never affect a score — see our affiliate disclosure.