Ultrahuman Heart Scan and Natura's $99 AI Ring, Explained - Memeburn

TL;DR

- Ultrahuman Heart Scan is a free 60-second rhythm check for the Ring Air and Ring Pro, powered by FDA- and CE-cleared FibriCheck, but it is not yet listed for the US.

- Natura's Interface ring costs $99 at launch plus $9 a month, and lets wearers press a finger to talk to Claude, ChatGPT, Muse, Grok and Instinct.

- Natura's founder says the ring costs about as much to make as an Oura or Galaxy Ring, so the $99 price is a subsidy recovered through the subscription.

- Over two years, Interface costs $261 to $288 against $479 for the subscription-free Ultrahuman Ring Pro.

Two smart ring announcements landed within a day of each other this week, and they pull the same piece of hardware in opposite directions. On October 7, Ultrahuman added Heart Scan, an on-demand 60-second heart rhythm check for its Ring Air and Ring Pro, while on October 8 the startup Natura unveiled Interface, a $99 ring whose main job is to let you press a finger and speak to Claude, ChatGPT, Meta’s Muse or Grok. One treats the ring as a measuring instrument that asks you to sit still, and the other treats it as a microphone and a button that assumes you are on the move.

Read together, the two launches say more about where smart rings are heading than either does alone. The sensors inside most rings have become broadly similar, which Natura’s founder openly admits, so the companies are competing on what the ring is for and on the software you pay for each month, and the answer to “which smart ring should I buy” increasingly depends on which of those two jobs you actually want done.

What Ultrahuman’s Heart Scan Actually Does

RingConn Gen 2 Air Smart Ring integrates AI

- AI-Powered Health Insights

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Heart Scan lets an Ultrahuman Ring Air or Ring Pro owner start a 60-second pulse recording from the app, keep still while it runs, and get one of five results, from Regular and Possibly irregular to Possible atrial fibrillation, Signal quality too low or Inconclusive, according to GSMArena. Each scan produces a FibriCheck PDF report with the pulse recording, a tachogram and a plot of beat-to-beat intervals, the scans are free for eligible ring owners, and the feature needs version 4.3.0 of the Ultrahuman app on iOS or 3.2.0.0 on Android.

The analysis runs on FibriCheck’s algorithm, which is FDA- and CE-cleared and reported 91.86% sensitivity and 97.59% specificity for atrial fibrillation when Ultrahuman first added overnight AFib screening in 2024, according to Gadgets & Wearables. That earlier feature watches heart rhythm in the background while you sleep and costs £4.90 a month or £49 a year in the UK, so Heart Scan is best understood as the free, spot-check companion to a paid nightly service rather than a replacement for it.

The limits matter as much as the feature. FibriCheck does not detect heart attacks or ischemic conditions, and a Regular result does not rule out a rhythm problem, which means Heart Scan is a screening prompt to see a doctor rather than a diagnosis. GSMArena lists supported markets across the UK, Europe, the Middle East and Asia-Pacific, and the US is not on that list even though Ultrahuman began selling its redesigned $479 Ring Pro there in March, after an ITC ruling in Oura’s patent case pushed the Ring Air out of the US market in October 2025, according to Tom’s Guide.

What Natura’s $99 Interface Ring Is Built For

Natura’s Interface ring lets the wearer press a finger to send a task or a thought to an AI agent, such as reading out the day’s schedule, reordering a product, controlling a TV or sending meeting notes to a colleague, with answers coming back through connected headphones, an iPhone Live Activity or Natura’s own app, according to TechCrunch. Different agents can be assigned to different jobs, so one might handle code while another books reservations, and the launch list includes Claude, ChatGPT, Meta’s Muse, Instinct and Grok.

Interface also tracks heart rate, resting heart rate, HRV, sleep stages, steps and skin temperature, and it lasts six to 12 days on a charge with a 100-minute recharge. It costs $99 at launch, after which a $9 monthly subscription starts once a free period of three to six months ends, and Natura plans to raise the hardware price later. Preorders are expected to open next month, with shipping planned for December or January.

The most revealing detail is about cost rather than features. Natura founder Carlo Edoardo Ferraris told TechCrunch that manufacturing Interface costs about as much as an Oura Ring or Samsung Galaxy Ring, because they share many of the same components, and that the low launch price is there to lower the barrier to entry. In other words, the $99 is an acquisition price, and the subscription is where Natura expects to earn its money.

Why Both Launches Move the Value Into a Monthly Fee

Size 8- Ftness & Sleep Tracker

- 40% smaller than the previous generation

- Oura Ring 5 uses unique sizing different from standard jewelry

- Oura tracks over 50 health metrics, including sleep, activity, stress

iOS and Android, Vascular Trends, Activity Tracker

- RingConn Gen 3 sizing differs from standard ring sizes due to its inner sensor design

- After a one-time calibration, RingConn Gen 3 analyzes multiple physiological signals

- RingConn Gen 3 features are instantly available on the app

Memeburn’s calculation of two-year ownership shows how differently the two companies charge for broadly similar hardware.

Natura’s two-year figure assumes 18 to 21 paid months at $9 on top of the $99 ring, which still undercuts the Ring Pro’s $479 sticker even though Natura charges every month and Ultrahuman does not. The difference is that Ultrahuman sells a premium ring and then charges only for specific health add-ons, while Natura subsidises the ring and makes the whole product depend on the subscription, so a buyer who stops paying keeps a working Ultrahuman ring but likely loses the reason Interface exists.

The Smart Ring Is Being Pulled Into Two Different Jobs

Heart Scan asks the wearer to keep still for a minute so the sensor can produce a clean pulse recording, which is the posture of a medical device that has to earn a doctor’s trust. Interface asks the wearer to press and talk while doing something else, which is the posture of an input device that has to be faster than pulling out a phone, and Ferraris argues that the ring will become the main interface between people and technology.

Those two jobs come with different risks. A rhythm check succeeds or fails on clinical accuracy and on how clearly it tells users what a result does not mean, and Ultrahuman leans on FibriCheck’s clearance for that. An always-available agent button succeeds or fails on trust in where the voice goes, and TechCrunch’s report does not say how Natura handles recordings or what data the connected agents keep, which is the first question a buyer should ask once preorders open.

Health-focused rings from Oura, Ultrahuman and RingConn and AI-first rings from Pebble and Vocci have so far sat in separate lanes, and Natura is trying to straddle both by bundling health tracking with agent access. Whether that works will depend less on the sensors, which Natura itself says are comparable, than on whether people want to pay $9 a month for a button.

When Heart Scan Reaches the US and What Natura Charges After $99

Three things will decide how these launches age. Ultrahuman has not said when Heart Scan will reach the US, which is now its most important market for the Ring Pro, and a US rollout would need to sit alongside an Oura patent dispute that has already removed one Ultrahuman ring from American shelves. Natura’s preorder page should reveal regions, sizes and a privacy policy, none of which TechCrunch reported. And the price Natura charges once the $99 launch offer ends will show whether the ring itself was ever meant to make money.

FAQs

What is Ultrahuman Heart Scan?

Heart Scan is a free, on-demand 60-second heart rhythm check for the Ultrahuman Ring Air and Ring Pro, analysed by FibriCheck’s FDA- and CE-cleared algorithm. It can flag possible atrial fibrillation, but a Regular result does not rule out a heart rhythm condition, and it does not detect heart attacks.

How much does the Natura Interface ring cost?

Natura’s Interface ring costs $99 at launch, followed by a $9 monthly subscription after a free period of three to six months. Natura says it plans to raise the hardware price later.

Which AI agents work with the Natura Interface ring?

At launch, Interface works with Claude, ChatGPT, Meta’s Muse, Instinct and Grok, and users can assign different agents to different tasks.

Is Ultrahuman Heart Scan available in the US?

Ultrahuman lists supported markets across the UK, Europe, the Middle East and Asia-Pacific, and has not announced a US date, even though its Ring Pro has been sold in the US since March 2026.