health trackers – Wearables aren’t just getting better; they’re getting harder to spot. From Apple Watch’s recognizable debut to smart rings, discreet smart earrings, and smaller CGMs from Dexcom, the industry’s push is clear: make health tracking something you live with quietl
For a decade, health tracking was something you could spot from across a room. You saw it on wrists—Apple Watch, Fitbit, Nike Fuelband—and you could almost guess what someone was doing with their day.
Now that same guess has gotten harder. Continuous glucose monitors can sit hidden in shirt sleeves. Smart rings, earrings, bracelets, and even necklaces can blend in like everyday accessories. Fitness bands sometimes disappear against neutral fabrics so well they look like fashion, not measurement.
The goal isn’t subtle marketing. It’s design philosophy. Forrester principal analyst Arielle Trzcinski said, in an interview with ZDNET, that “over time, we’ve noticed that these products have gotten smaller.”
The change feels almost backwards at first. Phones keep getting bigger—massive screens, trifoldable designs—while the devices that watch your body are going the other way: lighter, smaller, more capable, and less visible.
It’s part of a longer history of tech companies chasing size optimization. Apple’s first MacBook weighed 5 pounds, and the latest model weighs half that. In the wearables world, though, the shrinking has taken on a new purpose: hiding in plain sight.
When Tim Cook unveiled the Apple Watch in 2014, it jump-started a new category of mobile interaction, with the companion device living on your wrist. It also had a distinct, rounded square design that made it easy to recognize—and it became a conversation topic early on.
As more competitors entered the market, they tried to stand out through bold design. But Khosravi said that, once products are on the market, including the Apple Watch, “they are designed so that they can be recognized.”
Those days appear to be fading fast. With more than 550 million people worldwide owning a smartwatch, according to DemandSage data, the industry may no longer need to sell the concept of tracking sleep, steps, or stress. “We’re already sold,” Khosravi said.
The quiet bet behind today’s wearables is that if tracking becomes routine, it becomes useful.
Oura’s approach made that mainstream. While Oura wasn’t the first company to introduce smart rings as health trackers. it was the one that helped normalize discreet devices that people could wear for sleep tracking. In September, Oura announced it had sold 5.5 million Oura Rings, and it also recently and confidentially filed for an IPO.
In late May, Oura unveiled the Oura Ring 5, its smallest smart ring yet—40% thinner than the Oura Ring 4. Oura reduced the ring’s size by miniaturizing the LEDs used to track health metrics and changing the battery.
Alongside the thinner form, Oura increased battery life: from five to eight days on the Oura Ring 4 to six to nine days on the Ring 5.
Oura VP of product Maz Brumand explained to ZDNET that the combination of more powerful LEDs, a better battery, and Oura’s refined algorithm let the fifth-generation ring deliver more power with a slimmer design.
Brumand also described the direction explicitly: “My bet is that, after this ring comes out, it’s going to be very hard to recognize that this is actually an Oura Ring.”
He added that people might ask whether they want others to notice an Oura Ring. “That’s nice,” Brumand said, “but the goal or the mission is to fit into people’s lives the way they want.”
Other companies are moving toward the same kind of invisibility—sometimes in ways that look almost like jewelry.
Lumia smart earrings track blood flow and attach to the back of an earring stub. The earring back can be swapped with any earring stub, making the device extremely inconspicuous.
And it’s not just fashion-grade gadgets shrinking. In May, diabetes management and CGM maker Dexcom announced it is reducing the size of its latest CGM by 50%.
Lux Research Inc. senior research associate Safoora Khosravi said the goal is straightforward: companies are trying “to make these wearables in a way that is more invisible and easier to integrate into our lifestyle.”
That integration is what makes the data matter. Once wearers keep devices on consistently, they can reveal more than one-off measurements. Over time, a fuller picture of behavior, activity trends, sleep patterns, and diet emerges as people wear the tracker and log those data points.
More recorded data also improves what devices can do with it—spot deviations and help diagnose conditions, including Apple’s sleep apnea, hypertension, and atrial fibrillation detection.
But the payoff isn’t only clinical. Wearers are also learning how habits hit the body, such as the effect of “that nighttime glass of wine on their sleep and heart health,” by wearing a tracker to bed each night.
All of this feeds the same mission many tech companies are building toward: create something people can wear all the time, provide FDA-cleared features for diagnosis or detection, connect with doctors when necessary, and build a big-picture view of health through a small, always-worn device.
Small device, big job—at least, that’s how Khosravi frames why the form factors keep shrinking.
The majority of these devices work in the background. Health trackers record data on the device, send it to the app, and software sifts through it to create a comprehensive health summary that users can review and act on.
A health tracker is most useful when it passively monitors in the background, Khosravi explained, with a passive, indistinct build. That’s why many modern health trackers don’t call as much attention to themselves—or even look like wearables in the first place.
Because data power these diagnostics and most of the time happens retroactively, instant device display isn’t always required. Unless someone is logging a workout or taking an instant heart rate reading. which requires immediate processing and information display. data transfer doesn’t need to happen automatically. “Storage takes up a small part of the device,” Khosravi said.
Khosravi added that companies don’t need the heavy computation on the hardware itself. “They don’t have to have the hard burst for analyzing the data. They just have to send the data to the phone.”
There’s a big promise that still hangs over wearables—alerting you to a heart attack or dialing 911 during an emergency—but Trzcinski called that an edge case, “one of the few cases where a user must be alerted in real time about their health.”
That contrast shows why wearables can get smaller while other tech trends grow bulkier.
Trzcinski pointed to AI wearables like smart glasses or pins as an example of a different problem requiring real-time help. Smart glasses can translate languages, provide real-time AI assistance, take photos or videos, and play audio. That kind of in-the-moment work takes more computing power than recording heart rate or body temperature and sending the data to a phone.
“The magic happens on the app tied to the device,” Trzcinski said. “The value you’re getting is from the app.”
For these trackers, that app layer—the software that digests data and turns it into something helpful, useful, or even diagnostic—is the reason people use them.
Wearables, then, are built for repetition. Tech companies have uncovered the secret to successful health trackers: small packages that can do the big job of synthesizing lifestyle information and spotting health anomalies.
They also must be discreet and easy to wear so users will keep them on long enough for the data to become meaningful.
Khosravi summed up the direction in one line: “Now wearables are just trying to embed into the user’s daily life.”
health trackers wearables smart rings Oura Ring 5 Dexcom CGM smart earrings Apple Watch continuous glucose monitors passive monitoring FDA-cleared features