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Smart ring buying guide: 7 things to check before you buy

By the MyBestPick team · Updated November 10, 2026 · Prices are list or retailer prices at the time of research, not live Amazon prices.

Smart rings look alike, but they differ a lot in running costs, battery life and which phones they support. Check these seven things and you will avoid the most common regrets.

1. Is there a required subscription?

This is the biggest cost difference. Oura Ring 5 and Ring 4 need a membership ($5.99 a month or $69.99 a year) for the full app. RingConn, Samsung, Amazfit, Renpho and Leep do not. Reebok's ring may charge $99 a year after the first year, according to Tech Advisor, though other outlets say there is no fee, so confirm on Reebok's site.

2. Real battery life

Ratings in our comparison range from up to 4 days (Amazfit Helio Ring) to up to 15 days (Ultrahuman Ring Pro). Manufacturer figures are best-case. Wareable, for example, measured about 4 days on the Luna Ring Gen 2, which is rated at 4 to 7 days.

3. Sizing

Always order the sizing kit. Ring sizes do not match standard jewellery sizes, RingConn changed its system between Gen 2 and Gen 3, and some rings only come in a few sizes. The Amazfit Helio Ring is sold in sizes 8, 10 and 12 only.

4. Phone compatibility

Most rings work with iPhone and Android. The Samsung Galaxy Ring is Android only, and some of its features need a Samsung phone.

5. Charging case

A case lets you top up on the go. RingConn Gen 2 and Gen 3, Samsung, Ultrahuman Ring Pro, Circular Ring 2 and Leep include one. On Oura Ring 5 it is an optional extra.

6. Weight and thickness

Lighter rings are easier to sleep in. Oura Ring 5 is one of the lightest at 2 to 2.69 g. Renpho LYNX is 4 to 5 g.

7. US availability

Oura has filed patent claims against several ring makers. Ultrahuman's US availability changed during 2026, and Wareable reported the Luna Ring was pulled from US sale at one point. Check that the ring ships to you before you commit.