[ HEAD-TO-HEAD ]

Noise Luna Ring vs Amazfit Helio Ring (2026)

These are two of the cheapest subscription-free smart rings, both aimed at people who want core Oura-style tracking without the price or the membership. The Noise Luna Ring Gen 2 (~$300) leans on a pocket charging case for a long total battery and accurate sleep; the Amazfit Helio Ring ($199) is cheaper and lighter but ships in only three sizes. Both are value picks with trade-offs.

VERDICT: TIE

Two budget subscription-free rings. The Amazfit Helio Ring is cheaper ($199) and lighter; the Noise Luna Ring Gen 2 (~$300) has a wider size range, a charging case for long total battery, and equally good sleep tracking. Pick the Helio for lowest price if it fits, the Luna for better fit options and the charging-case convenience.

Noise6.7 / 10

Noise Luna Ring Gen 2

Smart ring

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.

Amazfit6.8 / 10

Amazfit Helio Ring

Smart ring

A genuinely cheap, subscription-free ring with decent sleep and HRV tracking — but only three sizes and a short real-world battery keep it a budget pick, not an Oura rival.

Head-to-head breakdown

Price
Amazfit Helio: $199. Noise Luna Gen 2: ~$300. The Helio is the cheaper ring.
Amazfit Helio Ring
Subscription
Tie — both are one-time purchases with no membership.
Tie
Single-charge battery
Both are modest — Luna ~4 days, Helio ~2.5–3. The Luna edges it, but its headline ~30 days depends on the charging case.
Tie
Fit & sizing
The Helio ships in only three sizes (8, 10, 12); the Luna offers a wider range, so more people can fit it well.
Noise Luna Ring Gen 2
Sleep tracking
Both track sleep well for the price — sleep staging is a strong point for each.
Tie
Extras
The Luna adds a voice-activated Luna AI assistant and a pocket charging case; the Helio is more bare-bones.
Noise Luna Ring Gen 2

Choose Noise Luna Ring Gen 2

Choose the Noise Luna Ring Gen 2 if you want good sleep tracking, a wider size range and a charging case for long total battery, and $300 is acceptable.

Choose Amazfit Helio Ring

Choose the Amazfit Helio Ring if you want the cheapest, lightest subscription-free ring and one of its three sizes fits you.

The short version

Two budget subscription-free rings. The Amazfit Helio Ring is cheaper ($199) and lighter but limited to three sizes; the Noise Luna Ring Gen 2 (~$300) has a wider size range, a charging case for long total battery and a voice assistant.

When the Noise Luna Ring is the right pick

You want good sleep tracking, more fit options and the charging-case convenience, and $300 is fine.

When the Amazfit Helio Ring is the right pick

You want the cheapest, lightest subscription-free ring and a size fits you.

Also worth comparing

For a longer single-charge battery at a similar price, see the RingConn Gen 2; against Oura, Noise Luna vs Oura Ring 4. Full field: best HRV trackers.

Common questions

Noise Luna Ring or Amazfit Helio Ring?

Both are cheap subscription-free rings with good sleep tracking. The Amazfit Helio is cheaper ($199) and lighter but comes in only three sizes; the Noise Luna (~$300) has a wider size range, a charging case for long total battery and a voice assistant. Pick the Helio for lowest price if it fits, the Luna for fit options and extras.

Which has better battery?

Roughly a wash on a single charge (Luna ~4 days, Helio ~2.5–3), but the Luna’s pocket charging case pushes its total battery far higher, so you recharge the ring less often overall.

Will these rings fit me?

The Amazfit Helio comes in only three sizes (8, 10, 12), so it may not fit; the Noise Luna offers a wider range and is the safer bet on fit.

See the full ranking

Best HRV Trackers (2026)

ONDA ranks the best HRV trackers of 2026 — rings, bands, smartwatches and chest straps — scored on measurement accuracy, sleep, data access and value.

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