Honest comparison
Ray vs. Oura
Oura is a ring. Ray is a bracelet. Both are minimal. Only one powers itself from light, has no subscription, and is designed for 10+ years.
The short answer
If you prefer a ring to a bracelet and don't mind a $6/month subscription, Oura is excellent. If you want similar health data on your wrist, with no subscription and no charging, get Ray.
Side by side
| Ray | Oura | |
|---|---|---|
| Form factor | Wrist bracelet | Finger ring |
| Power | Harvests light; ~60 days in darkness | 5–8 days; size-specific charger |
| Subscription | $0 forever | $6 / month |
| Weight | 7 g | ~5 g |
| Up-front cost | $199 one-time | From $349 |
| 5-year cost | $199 | From ~$699 with annual membership |
| Sensors | HR, HRV, temp, sleep, steps, light | HR, HRV, temp, sleep, SpO₂ |
| Primary purpose | Passive wrist tracking | Sleep and recovery in a ring |
Reasons to choose Ray
- No charging ritual. Ray harvests energy from light; Oura Ring 4 is rated for 5–8 days per charge.
- No subscription. Full Oura insights currently require a $5.99/month or $69.99/year US membership.
- Lower up-front cost. Ray is $199 once; Oura Ring 4 currently begins at $349 before membership.
- Designed for long ownership. Ray has a target useful life of 10+ years and no charging port.
- Wears as jewelry, not a ring. Some people don't want a metal ring on their finger 24/7.
- Hardware warranty. Coverage terms apply.
Reasons to choose Oura
- Oura's ring form factor is genuinely tiny — for some people the finger is preferable to the wrist.
- Oura has SpO₂ (blood oxygen) tracking; Ray does not.
- Oura's sleep algorithms are well-validated and have a long track record.
- If you also wear an Apple Watch on your wrist, Oura on the finger doesn't conflict — Ray does occupy a wrist.
The 5-year math
Oura is the closest competitor in spirit — both are minimalist health trackers without screens. The difference shows up over time.
Ray
$199
over 5 years, total
Oura
From ~$699
$349 ring + $69.99/year × 5
What verified purchasers said
Feedback from verified Batch 1 purchasers who received and tested Ray.
"Your hardware passes the invisibility test."
"This band is so light. I forgot I was wearing it!"
Common questions
Why a wrist bracelet instead of a ring?
Two reasons. Rings can't fit a solar panel large enough to harvest meaningful light. And a wrist bracelet integrates more naturally with most people's existing watch / jewelry routine.
Does Ray track sleep as well as Oura?
Ray tracks sleep stages, HRV, body temperature, and sleep duration — the same core metrics Oura tracks. Wrist-based PPG and ring-based PPG have different tradeoffs but produce comparable nightly summaries.
Can I wear Ray and Oura together?
Of course — they're on different body parts. Many of our testers cross-validated Ray against their Oura for the first month.
Does Ray have SpO₂?
Not in this version. We prioritized sensors that have the most actionable daily insights (HRV, temperature, sleep). SpO₂ is on the roadmap for a future hardware revision.
When does Ray ship?
Batch 2 is reserving now and ships in September 2026. Refundable any time before shipping.
Minimal tracking, in the form that fits you.
Ray offers a screen-free wrist alternative without a dock or subscription; Oura offers a mature ring-based sleep ecosystem.
Order Ray — $199Ships in September 2026 · Hardware warranty · Fully refundable