Levels

Levels inherits the accuracy of the FDA-cleared sensor you pick, and its default Dexcom hardware is among the most accurate non-implantable CGMs, so the underlying glucose signal is clinically validated (though Libre 3 and Abbott Lingo post marginally lower MARD).

Dexcom G7 overall MARD was 8.2% (arm) and 9.1% (abdomen) versus the YSI 2300 lab analyzer across 316 adults, 619 sensors and 77,774 matched pairs. Diabetes Technology & Therapeutics (Dexcom G7 pivotal) ↗

Judged on breadth, Levels tracks essentially one biomarker (glucose) with meal scoring, zone/stability scores and optional lab add-ons; it is a single-biomarker platform by design and does not cover heart rate, sleep, activity or other metrics, so its coverage is narrow versus a general health tracker.

Levels adds metabolic scoring, a 1-10 zone system, meal ratings, daily reports and AI adaptive programs on top of a single glucose sensor (Dexcom Stelo/G7 or Libre 3), with lab panels available only as paid add-ons. Optimize Biomarkers (Levels 2026 review) ↗

As a patch-based CGM there is nothing to charge; the sensor simply runs for its full wear window, which is the relevant reliability measure for this form factor.

The Stelo biosensor used with Levels lasts ~15 days per sensor with no charging, streaming glucose every 5 minutes across the whole wear period. Optimize Biomarkers (Dexcom Stelo review) ↗

A small upper-arm patch worn continuously is unobtrusive for most users, though it is an adhesive skin sensor rather than a truly no-contact device, and some users report sensor-site irritation.

The Stelo sensor Levels ships is a single biosensor worn continuously for ~15 days per application, a wear-and-forget patch form factor. Levels Support (Stelo biosensor) ↗

The app is central to the product and offers AI meal-photo scoring, but its integration is largely Apple Health only and independent reviewers repeatedly report app-to-CGM sync failures, buggy behavior and clunky food logging.

The review reports connectivity problems between the app and CGM causing inaccurate, delayed or missing readings, integration limited mainly to Apple Health, and clunky food logging with many missing foods and failed entries. Nucleus (independent Levels review) ↗

Value is the weak dimension: the membership is a recurring fee on top of sensors, and the same Stelo hardware is cheaper bought direct, so you are paying mainly for the software.

Levels membership is $15/month or $80/year for the app, with CGM sensors as a separate add-on at about $89 per shipment, so full glucose tracking stacks membership plus ongoing sensor cost. Levels Support (pricing and plans) ↗