A practical, affordable, subscription-free Oura alternative — good sleep tracking and a long total battery via its case, though single-charge battery and some app rough edges keep it a value pick rather than a class leader.
Best for a cheap, subscription-free ring with solid sleep tracking and a long total battery via its case — a practical Oura alternative on a budget.
The Noise Luna Ring Gen 2 is a budget, subscription-free smart ring aimed squarely at people who want core Oura-style tracking for less. At around $300 with no membership, it covers heart rate, HRV, SpO2, skin temperature, sleep and automatic activity detection, with a "Luna AI" assistant. Sleep staging is genuinely accurate and the pocket charging case stretches total battery toward a headline ~30 days — but the ring itself lasts only about four days per charge, a step behind class leaders, and the app has some teething issues. It’s a reliable, practical alternative rather than a groundbreaking one.
How we tested: Evidence-based assessment — scored from Noise specifications and independent 2026 reviews of the Luna Ring Gen 2. Not hands-on tested by ONDA.
HRV tracking for recovery and stress — reasonable for the price, not validated to Oura’s level.
Sensor and signal quality
6.5
Optical heart rate, SpO2, PPG and skin-temperature sensors. A competent budget array.
Sleep tracking accuracy
7.5
The standout — sleep staging felt accurate in independent testing, and automatic activity detection (walks, jogs) worked reliably.
Data access and export
6.0
Data lives in the Noise/Luna app with basic export; no open API.
Wearability and battery
6.5
Comfortable, and the pocket charging case pushes total battery toward ~30 days — but only ~4 days per single charge, behind class leaders.
App and software experience
6.5
Includes a voice-activated "Luna AI" assistant; capable, though independent reviews noted some teething issues.
Value
8.0
Around $300 with no subscription — a genuinely affordable, own-it-outright Oura alternative. The main reason to buy.
Pros
+Affordable (~$300) and subscription-free
+Accurate sleep staging and reliable activity auto-detection
+Pocket charging case pushes total battery toward ~30 days
+Voice-activated Luna AI assistant
Cons
−Only ~4 days battery per single charge — behind class leaders
−Some app teething issues
−Accuracy below Oura’s validated reference
−No open API
Price: $300 approx.; one-time, no subscription (as of 2026-09-06)
Where it leads
The Noise Luna Ring Gen 2’s pitch is value: core smart-ring tracking, no subscription, around $300. It covers heart rate, HRV, SpO2, skin temperature and sleep, with a voice-activated Luna AI assistant. Sleep staging is its strongest area — accurate in independent testing — and automatic activity detection works reliably. The pocket charging case pushes total battery toward a headline ~30 days.
Where it falls short
The single-charge battery is only about four days, a step behind class leaders that run a week or more, so you lean on the case. The app has some teething issues, and accuracy — while fine for trends — is below Oura’s validated reference. This is a practical alternative, not a groundbreaking one.
Who it is for
Choose the Noise Luna Ring Gen 2 if you want a cheap, subscription-free ring with good sleep tracking and don’t mind topping up with the case. For a longer single-charge battery at a similar no-subscription price, see the RingConn Gen 2; for the cheapest option, the Amazfit Helio Ring; for the accuracy reference, Oura.
