Updated September 30, 2026 · ThriveCue Editorial Team
Circular vs ERA-FIT
Where Circular and ERA-FIT differ
| Compare |  Circular |  ERA-FIT |
|---|---|---|
| Price from | $349 | €219 |
| Membership per month | $0 | €0 |
| Battery life | 8 days | 10 to 14 daysHigher |
| Water resistance (m) | 50 | 100Higher |
| Markets | LV, JP, IN, TH, CN, ID, VN, HK, SG, TW, KR, PH, MY, BD, KH, AL, DE, AD, AM, AT, BY, BE, BA, BG, CY, VA, HR, DK, ES, EE, FI, GE, GI, GR, GL, GG, HU, IM, AX, FO, IE, IS, IT, JE, XK, LI, LT, LU, MK, MT, YT, MD, MC, ME, NO, NL, PL, PT, CZ, RE, RO, SM, RS, SK, SI, SE, SJ, TR, UA, FR, IL, FJ, MX, PF, PG, AZ, LA, LB, LK, MN, MO, NP, PK, PS, TJ, UZ, AR, BR, CI, CM, CO, CV, DZ, EC, EG, GA, GF, GH, GM, GN, GW, LY, MA, MG, ML, NE, NG, PE, SN, TN, UY, ZA, BL, MF, MQ, PM, CL, CA, SC, BH, OM, SA, QA, AE, KW, MM, JO, AU, NZ, CH, GB, USCovers more | AT, DE, CH |
Same on both: Platforms (iOS, Android), Warranty (1 year).
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Key differences
- ERA-FIT scores higher overall: 8.9 vs 8.8.
- Battery life is higher at ERA-FIT: 10 to 14 days vs 8 days.
- Water resistance (m) is higher at ERA-FIT: 100 vs 50.
- Support channels: only Circular offers Help centre.
- Circular is available in 127 more countries.
- Health sensors: only Circular offers Ecg, Blood pressure.
- Health sensors: only ERA-FIT offers Gps.
- Markets: only Circular offers LV, JP, IN.
Our verdict on each
Circular
Circular suits anyone who wants a smart ring without a recurring subscription, and it holds the top spot on membership cost with a monthly fee of $0. The catch is endurance: 8 days of battery sits below what rivals manage.
ERA-FIT
ERA-FIT suits anyone who wants a screenless smart ring with no subscription attached, since the Nextring runs at €0 a month and membership is not required. The trade-off is coverage: it ships to AT, DE and CH and carries 1 year of warranty, so buy it for tracking rather than for a broad hardware lineup.
Score breakdown
| Area | Circular | ERA-FIT |
|---|---|---|
| Cost | 8.8Entry price of $349 ranks 29 of 31, and the membership costs $0. | 8.9HigherEntry price of €219 with membership listed as not required and a monthly plan price of €0. |
| Offer | 8.8Membership fee of $0 places it 1 of 21 on that measure. | 8.9HigherThe Nextring tracks heart rate, spo2 and skin temperature, runs 10 to 14 days per charge and carries 1 year warranty. |
Positions in our rankings
| Ranking | Circular | ERA-FIT |
|---|---|---|
| Smart rings | 12 of 14 | 11 of 14 |
Which one suits you
Pick Circular if markets matter most.
Pick ERA-FIT if battery life and water resistance (m) matter most.
Where each is licensed and available
| Country | Circular | ERA-FIT |
|---|---|---|
| Headquarters | France | Austria |
Available in 3 countries for both. Additional countries for Circular: 127.
Every fact side by side
| Fact | Circular | ERA-FIT |
|---|---|---|
| Products | Smart ring | Smart ring |
| Health sensors | Heart rate, Spo2, Ecg, Skin temperature, Hrv, Sleep, Blood pressure | Heart rate, Spo2, Skin temperature, Hrv, Sleep, Gps |
| Legal entity | Circular Health Limited | ERA-FIT GmbH |
| Headquarters | France | Austria |
| Support channels | Email, Chat, Help centreCovers more | Email, Chat |
Fitness equipment
| Fact | Circular | ERA-FIT |
|---|---|---|
| Membership required | Not confirmed | No |
| Screen size (in) | Not confirmed | 0 |
| Money-back period | Not confirmed | 30 days |
Where each stands against the rest
| Fact | Circular | ERA-FIT | Median |
|---|---|---|---|
| Battery life | 8 daysbelow the median | 10 to 14 daysat the median | 14 days |
| Water resistance (m) | 50at the median | 100above the median | 50 |
| Warranty | 1 yearat the median | 1 yearat the median | 1 year |
Median across 27 listed brands.
Pros and cons
Circular
Pros
- No recurring membership charge at $0, which ranks 1 of 21 brands.
- Entry price of $349 is a single hardware cost rather than a package that hides a subscription.
- Water resistance of 50 metres suits swimming, showering and general wear.
Cons
- Battery life of 8 days ranks 16 of 23 brands, so charging is more frequent.
- The entry price of $349 sits at 29 of 31 brands, so the hardware itself is not the cheapest.
- Support runs on email, chat and help centre only, with no phone line listed.
ERA-FIT
Pros
- No membership required, and the monthly plan price is €0, so the €219 ring is the whole outlay.
- Battery life of 10 to 14 days and water resistance to 100 metres suit overnight and pool wear.
- The sensor set covers heart rate, spo2 and skin temperature in one ring.
Cons
- Warranty cover of 1 year is thin for a device you sleep and swim in.
- Support runs on email and chat only, so sizing and setup questions go by email or chat rather than a call.
- A screen of 0 inches means nothing shows on your wrist, so the phone has to be within hand for every reading.
Who each suits
Circular
Who it suits
- Buyers who want a ring and no monthly membership, given the fee of $0.
- People who care about durability over battery, with resistance of 50 metres and a 1 year warranty.
- Senders who travel often, since Circular Health Limited ships across LV, JP and IN.
Who should look elsewhere
- Battery-first buyers, who should look at Oura, where the entry price starts at €265.30.
- Shoppers who want a ring plus a watch, since Amazfit and Samsung both list wider product ranges while Circular sells smart ring only.
ERA-FIT
Who it suits
- Buyers who want recovery and sleep data without a monthly fee, since membership is listed as not required and the plan price is €0.
- People who would rather not wear a display, given a screen of 0 inches and readings held in the app.
- Customers in Austria, DE and CH who wear the ring in water to 100 metres.
Who should look elsewhere
- Anyone who wants a watch, fitness tracker, chest strap or smart scale from the same maker, since smartwatch, fitness tracker and smart ring covers those types.
- Buyers settled on Oura and ready to pay more, since that ring starts at €265.30 against ERA-FIT at €219.
- Shoppers who want a smartwatch and a ring from one brand, since smartwatch and smart ring lists both.
Country by country
| Country | Circular | ERA-FIT |
|---|---|---|
| Aland Islands | Yes | No |
| Albania | Yes | No |
| Algeria | Yes | No |
| Andorra | Yes | No |
| Argentina | Yes | No |
| Armenia | Yes | No |
| Australia | Yes | No |
| Azerbaijan | Yes | No |
8 of 130 countries where either is available.
Questions about each
Circular
How much does the Circular ring cost?+
The entry price is $349, charged for the hardware itself. There is no joining fee to use it, since the membership costs $0. Readers comparing total ownership over several years will find the hardware cost is front loaded rather than spread across a subscription.
Is there a membership fee for Circular?+
No monthly membership is charged, as the membership costs $0. That places Circular 1 of 21 brands on that measure. It is the main reason to pick this ring over rivals that tie the app to a recurring plan.
ERA-FIT
How much does the ERA-FIT ring cost, and is there a monthly fee?+
The Nextring is listed from €219, paid once for the hardware. Membership is listed as not required and the monthly plan price is €0, so the checkout figure stays the recurring figure unless other hardware is added later.
Do I need a membership to use the ring?+
Membership is listed as not required and the monthly plan price is €0. The readings come through the phone apps on iOS and Android, and the ring carries heart rate, spo2 and skin temperature for tracking. Any paid tier would sit outside the ring, so the ring itself adds no renewal charge.