A smart ring that estimates continuous glucose trends without a sensor in your arm — the first credible attempt at non-invasive CGM in a wearable.
Non-invasive glucose has been the holy grail of consumer wearables for a decade. Every year a startup announces it; every year the science doesn't hold up. Ambrosia's RIZZ is the first ring-form-factor product worth taking seriously, and it lands in 2026 with a clear positioning statement: this is glucose *trend* data, not lab-grade absolute values.
What that means in practice: you wear the ring and get continuous directional readings — pre-meal baseline, post-meal response shape, overnight stability. The number it reports is a calibrated estimate, and Ambrosia is upfront that for absolute accuracy you should still pair with a Dexcom or Libre CGM via the BluCon NightRider add-on. For users who've already done their 30-60 days with a real CGM and just want the *pattern* tracked without another sensor change, RIZZ is genuinely useful.
The competitive frame: this is not Levels (which uses real CGMs), not Oura (which doesn't track glucose at all). It's the first product in a new category — non-invasive glucose tracking — and the credibility hinges on Ambrosia continuing to publish validation data over the next 24 months.
Buyers who completed a CGM program (Levels, Veri, Nutrisense) and want continuous glucose-trend data without re-applying a real CGM every 14 days.
You are newly curious about glucose — start with a real CGM (Levels or pharmacy Libre) for the first 30-60 days. RIZZ is for the after-program use case.