Oura's IPO shows the smart ring moat isn't the sensors
Oura filed to go public with $1.21B in nine-month revenue and 5 million paid members. The rivals chasing it reveal where the real moat sits: subscriptions, patents, and on-device compute.
The smart ring market just got its first real financial disclosure, and it says something different from what the product marketing says. Oura filed to go public on September 3, 2026, and the numbers in that filing tell you the company is not primarily a sensor business.
TechCrunch's rundown of the challengers coming for Oura's crown lists six players trying different angles. I read that list and saw three separate moats, only one of which is technical.
📊 The arithmetic in the filing
The disclosed figures are worth sitting with before looking at any competitor spec sheet:
| Metric | Figure |
|---|---|
| Revenue, nine months to June 30 | $1.21 billion (nearly doubled) |
| Rings sold, past year | 3.6 million |
| Paid members | ~5 million |
| Latest product | Oura Ring 5, billed as its slimmest and lightest |
Look at the last two rows together. Paid members exceed rings sold in the past year by roughly 1.4 million. That gap is people who bought hardware in an earlier year and are still paying every month. Hardware got them in; the subscription is what compounds.
Key takeaway: A competitor can match Oura's sensors in one hardware cycle. Matching a base of five million people already in the habit of paying a recurring fee takes years, and no spec sheet shortens it.
⚖️ The second moat is a patent docket
The most instructive fact in the whole story has nothing to do with heart rate accuracy. Ultrahuman's US business was disrupted in October 2025 after an ITC ruling went Oura's way in a patent dispute. Not a bad review, not a failed sensor. A trade ruling.
For anyone in Sri Lanka building hardware or a hardware-adjacent product aimed at Western markets, that is the lesson to file away:
- Your technical roadmap can be correct and your market access can still be switched off by a body you never presented to.
- Freedom-to-operate work is not a legal formality you do after product-market fit. In a crowded sensor category it is part of the design constraint.
- The incumbent with revenue can afford to litigate for years. You probably cannot.
Ultrahuman has since raised $70 million with Qualcomm venture backing and is shipping the Ring Pro at $479 in the US from mid-September. Money solves the appeal; it does not give back the year.
🔋 Squeezing a dual-core CPU onto a finger
Here is the part that actually interests me as an engineering problem. The Ultrahuman Ring Pro carries a dual-core processor and redesigned heart-rate sensing, with the stated aim of running on-device software for AI interactions and even games.
A ring is the tightest power and thermal budget in consumer hardware. There is no room for a fan, the battery is a sliver, and the whole thing sits against skin, so waste heat is a comfort problem before it is a reliability problem. Putting general compute in there is not a gimmick decision. It is a margin decision:
- Cloud inference costs money per user, per day, forever. A subscription business with millions of members pays that bill every single month.
- On-device inference costs money once, in silicon, at manufacture.
- Latency and privacy improvements are real, but they are the pleasant side effects. The spreadsheet is the driver.
That trade should feel familiar if you have built anything on a free tier. It is the same reason we run several tools on induwara.lk fully client-side rather than paying for a server round trip per request. When per-user marginal cost is your enemy, you push work to the edge, whether that edge is a browser or a titanium band.
🌐 The field, and what each one is betting on
| Company | Price | Availability | The bet |
|---|---|---|---|
| Oura | Not disclosed in filing coverage | Shipping (Ring 5) | Installed base + subscription |
| Ultrahuman | $479 (Ring Pro) | US from mid-Sept 2026 | On-device compute, apps, games |
| RingConn | From $349 (Gen 3) | Since May 2026 | Price, plus vascular health insights |
| Samsung | $399 (Galaxy Ring, 2024) | Shipping | Bundling into the Galaxy ecosystem |
| Circular | Not announced (Ring 3) | Early 2027 | Medical-grade claims + NFC payments |
| Dreame | Not announced | Not announced | Haptics and an on-ring touchpad |
Two of these are notable for what they lack or promise. Samsung's Galaxy Ring, at $399 since 2024, still does not do sleep apnea or AFib detection, which is a striking gap for the company with the most distribution. Circular is going the other way entirely: the Ring 3 Pro claims FDA-cleared ECG for AFib detection, plus blood pressure and glucose tracking.
If Circular ships glucose tracking from a ring on the stated timeline, that is a bigger story than the IPO. Treat unshipped medical claims with the scepticism you would apply to any pre-launch spec sheet. Early 2027 is not a shipping date, it is a window.
💰 What one of these actually costs in Sri Lanka
The listed price is the smallest part of the bill here. A realistic total cost of ownership has four lines:
- The hardware. $349 to $479 for the ones with announced prices.
- Import duty and clearance, if it comes in as a personal import or in your baggage. Rates vary by category and consignment value, so check the current schedule with our Sri Lanka customs baggage allowance calculator rather than guessing.
- The subscription. Oura's five million paid members are paying for something recurring. Budget for a monthly fee in LKR, converted at whatever the rate is on renewal day, not on purchase day. Our currency converter is the boring but necessary step here.
- Sizing and returns. A ring that does not fit is a paperweight, and cross-border returns from Sri Lanka are painful and slow.
Before you spend that, be honest about what you would do with the data. If the goal is better sleep or smarter training, most of the value comes from acting on simple numbers you can get for free. A sleep cycle calculator will tell you when to go to bed tonight, and a heart rate zone calculator will tell you what pace to run at, both for zero rupees. A ring measures adherence. It does not create it.
💡 What this means for you
- If you are buying: wait. Ultrahuman ships this month, Circular's medical-claim ring lands early 2027, and RingConn is already at $349. Prices in this category are heading down while the feature floor is heading up.
- If you are building hardware: budget for freedom-to-operate research the way you budget for tooling. The ITC ruling took Ultrahuman out of its biggest market without a single technical failure.
- If you are building software: the on-device compute shift in a $479 ring is the same economics that should push your own inference to the client. Recurring per-user cost is what kills small-team margins, not the initial build.
- If you are studying this space: the filing is the most useful public document in consumer wearables right now. Subscriptions carried it, not sensors.
The rings are converging. The business models are not, and that is where this fight gets decided.