Apple is exploring a major Apple Watch overhaul that could include a round display, a ceramic casing and even new types of fitness wearables.
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RingConn has always been a solid challenger to Oura in the smart ring space, and after spending two weeks testing it, I can safely say the new RingConn Gen 3 continues that trend. You’ll get most of the same health, sleep and recovery tracking features as rivals in our best smart rings guide here, but without the monthly subscription that puts some people off buying a smart ring altogether.
The Gen 3 tracks heart rate, heart rate variability (HRV), blood oxygen levels, skin temperature, respiratory rate, stress, activity and sleep. New additions include a haptic motor for some alerts and reminders, improved battery life and new vascular health trend insights, which are designed to give you a picture of your cardiovascular wellbeing over time.
However, this version does feel similar to the Gen 2 that came before it. The design and app experience feel largely unchanged and many of the core features will already be familiar to anyone thinking of upgrading from a RingConn Gen 2.
Although that's not necessarily a bad thing. The lightweight titanium design is still incredibly comfortable to wear and the app is simple to navigate. RingConn also continues to stand out by offering useful features like sleep apnea monitoring, something that still isn't standard across the smart ring market.
The experience here isn't perfect. During my testing, I found that some health insights can feel generic, certain wellness scores lack meaningful context and some of the messaging around features like vascular insight trends can be confusing. And, while the app is clean and easy to use, it still doesn't feel quite as refined or polished as Oura's.
But RingConn continues to occupy a compelling middle ground. It isn't the cheapest smart ring you can buy, but it undercuts premium competitors while delivering a similar experience overall.
The RingConn Gen 3 may not be the most exciting smart ring launch of the year, but for anyone looking for comprehensive health tracking without an ongoing subscription, it's shaping up to be one of the easiest smart rings for me to recommend.
Component | RingConn Gen 3 |
Price | $426 (silver, gold, matte black) / $454 (brushed silver and brushed rose gold); £322 / £343 (approx) |
Dimensions | 2.3mm thick |
Weight | 2.5g to 3.5g (depending on size) |
Finish | Silver, gold, matte black, brushed silver, brushed rose gold |
Sizes | 6 to 15 |
Material | Titanium body, medical-grade epoxy interior with a PVD coating |
Battery life | 10 to 12 days (with vibration on), 11 to 14 days (with vibration off) |
Sensors | Optical Heart Rate Sensor, Temperature Sensor, 3-Axis Accelerometer and Vibration Feedback Motor |
Connection | Bluetooth 5.0 |
Water resistance | IP68 / 10ATM |
Pricing starts at $426 for the silver, gold and matte black versions. That rises to $454 if you’d like the new brushed silver and brushed rose gold finishes.
I only tested the standard silver, but the brushed effect is really appealing. At least what I can see from promo shots, it makes the ring look a little more refined and if I was buying one myself I’d probably pay extra for that finish.
UK pricing hasn’t yet been confirmed at the time of writing, but that US pricing works out at approximately £322 to £343, depending on the finish you choose.
That places the RingConn Gen 3 firmly in the premium smart ring category. It's not cheap by any means. You can now find more affordable smart rings, like the Circular Ring 2, which starts at $349 / £280 / AU$497.
However, it still manages to undercut some of its biggest competitors, making a tempting value proposition. For context, the new Oura Ring 5 starts from £399. Which, granted, isn’t that much more expensive. But you do need to factor in the ongoing monthly subscription, which you’ll need to unlock all of the Oura’s features. That costs $5.99 / £5.99 per month. So paid monthly, that’s around an additional $70 / £70 per year.
What makes RingConn stand out is that there are no subscription fees here. Once you've bought the ring, you get access to all of the core health and wellness features without any additional monthly costs.
It’s worth mentioning that other smart ring brands are offering their devices without a monthly subscription too. And the gap between RingConn and its premium competitors isn't quite as large as it once was, especially as smart ring prices continue to rise across the board. But when you factor in the lack of subscription fees and the breadth of features on offer, the RingConn Gen 3 still represents good value.
The first thing you'll notice about the RingConn Gen 3 when you take it out of the box is its unusual shape. Rather than being perfectly round, it has a subtle squared-off design. It looks a little unusual at first, but I really liked it. Plus it seemed like a refreshing choice in a market where so many smart rings are almost indistinguishable from each other.
At between 2.5g and 3.5g depending on which size you get, and measuring 2.3mm thick, the ring is light and discreet enough to forget you're wearing it. I wore it day and night when I was testing it, including while sleeping, without any issues.
That weight and thickness are both fairly standard compared to other smart rings. The only notable exception is the new Oura Ring 5, which has been designed to be slimmer and lighter than previous generations and almost all rivals.
The Gen 3 ring is made from titanium with a medical-grade resin interior and is rated IP68 and 10ATM for water resistance. In practical terms, that means you can wear it in the shower, while swimming and during workouts without worrying about taking it off. During testing, I rarely had to think about removing it, whether I was washing up, showering or exercising — though I did remove it when lifting weights to avoid any scratching.
RingConn has also expanded its sizing range this time around, now offering up to size 15. Many competing brands don't go beyond size 14. One thing to be aware of here is that RingConn says the Gen 3 sizing may differ slightly from standard ring sizing and other smart rings. Which means it may be worth using the sizing kit first just to be safe. Although I tested my usual size without any issues.
There are several new finishes available, including brushed silver and brushed rose gold. I tested the glossy silver model, which held up surprisingly well during testing. After more than a week of daily wear, there were no visible scuffs or scratches, even on close inspection.
That's really notable because when I’ve tested many smart rings in the past I've found that some finishes, particularly matte black ones, can start showing signs of wear after only a few days.
That said, if I were buying this ring myself rather than reviewing it, I'd probably choose one of the new brushed finishes, even though they cost a little more. After years of testing smart rings, I've come to think that the super glossy finishes are often what make them look like gadgets rather than jewellery. So if making sure a smart ring blends in is important to you, the brushed options are probably worth considering.
My only real criticism is that there isn't an obvious external marker showing which way round the ring should be worn. That's really nit-picking, but it's something some competitors have added. While it's easy enough to identify the correct orientation from the sensor placement inside the ring, a small external indicator, like a tiny notch, would make it quicker and easier to position correctly for the most accurate readings.
The charging case is handy. It's compact, easy to throw into a bag and feels more refined than previous versions. Unlike some competitors, it's also not tied to a specific ring size, which might be useful for you if you know someone else who has a RingConn ring.
You’ll find all of the health and wellness features you'd expect from a premium smart ring here. The Gen 3 continuously tracks heart rate, heart rate variability (HRV), blood oxygen saturation (SpO2), respiratory rate, skin temperature, stress, activity levels and sleep. There's also menstrual tracking and a Baby Prep mode to support ovulation prediction.
Alongside these core features, RingConn offers a few more advanced tools that are designed to help it stand out from rivals. One of the most useful is sleep apnea monitoring. Once enabled, it monitors for the core signs of sleep apnea and provides short-term risk indicators alongside longer-term trends.
Like any wearable health feature, it's not designed to diagnose a medical condition. But I think it could be useful if you're concerned about your sleep quality or breathing patterns and want some additional information before you speak to a doctor.
New for the Gen 3 is a built-in haptic motor, which means the ring can now vibrate for health alerts, inactivity reminders and low-battery warnings.
At first, I was conflicted about this addition. Part of the appeal of smart rings for me is that they collect data in the background without demanding attention in the way a smartwatch can. Fortunately, RingConn has taken a restrained approach. The vibrations are subtle, focused on health-related notifications rather than phone alerts and can be disabled entirely if you'd prefer that.
Another notable addition is RingConn's vascular health tracking. Rather than attempting to estimate blood pressure directly, the feature combines overnight vascular load data with blood pressure readings and lifestyle information to provide longer-term cardiovascular insights.
To use it, you'll need to periodically enter blood pressure readings from a traditional blood pressure cuff. Initially, I wasn't convinced of the value of this feature. Wouldn’t you just use a cuff instead of the ring if you have one? But it became clear during testing that the goal here isn't to replace a blood pressure monitor. Instead, it's designed to help identify broader patterns over time.
One reason for the confusion is likely that in the app this section is labelled as 'blood pressure trends', which RingConn tells me is out-of-date copy and will be changed to 'vascular insights' soon to make it clear this isn't just a blood pressure reading feature.
Because the data you get here is about circulation stress tracking, which RingConn describes as a measure of how effectively your body moves between activity and recovery. Results are then also broken down into areas such as day-night rhythm, sleep breathing, post-exercise recovery and stress response.
The insights aren't especially deep, and if anything is flagged you'll need to go and search for what it means, but they're among the most detailed explanations available in the RingConn app and provide useful context without becoming overwhelming.
As with any smart ring, the Gen 3 relies heavily on its app, and RingConn gets a lot right here. While it doesn't feel quite as polished as Oura's software, I found it easy to navigate through the different menus. I also liked the flower-like Wellness Balance graphic at the top of the dashboard, which provides a quick visual snapshot of your overall health.
The app makes it easy to check key metrics at a glance, while more detailed charts, historical trends and explanations are there if you click through into each dedicated section, including sleep, activity and stress. Stress tracking was a particular highlight, making it easy to spot recurring patterns and periods of higher pressure throughout the day.
Some of the written insights can feel a little generic though, as daily summaries occasionally surfaced observations that felt obvious or lacked enough context to be genuinely useful. Sleep insights tended to be more helpful, with more detailed explanations and recommendations.
Sleep tracking is one of RingConn's strongest areas. The app presents sleep duration, efficiency, stages, overnight heart rate and movement data clearly without overwhelming you with information. During testing, it also handled my occasionally unusual sleep schedule surprisingly well, which meant that on nights when I woke up for an hour in the early morning before falling back asleep, RingConn correctly identified this as a brief 'awake' period rather than ending the sleep session entirely.
In terms of accuracy, I wore the RingConn Gen 3 alongside a Whoop 5.0. The two devices produced very similar results. Whoop measured a 84% sleep performance, 6 hours and 31 minutes of sleep and a 49bpm average overnight heart rate. RingConn gave me a 77 sleep score, recorded 6 hours and16 minutes of sleep with a 48bpm average overnight heart rate
Sleep stage breakdowns also aligned closely, with only minor differences in deep and REM sleep estimates. No wearable tracks sleep perfectly, but the results were broadly consistent.
I also appreciated how RingConn handles unusual readings. Rather than generating alarming warnings whenever a metric moves outside of its normal range, the app generally presents changes with reasonable context. I'd still like more explanation in some areas, particularly when a metric is flagged. I was often felt feeling a little frustrated at the lack of context and additional information as to why a reading deviated and what that really means. But the overall approach feels useful and sensible.
Sleep apnea monitoring is well implemented here. The feature presents trends clearly, includes some useful explanations and feels more mature than some of the app's other health insights. It's worth noting though that monitoring won't function properly once battery levels drop below 30%.
Exercise tracking is more basic than what you'll get from a dedicated sports watch, although that's true of most smart rings. During testing, the ring automatically detected walking, running and strength-training sessions without requiring manual input. You just need to acknowledge it’s identified your activity correctly and there are a wide range to choose from.
In the activity section you’ll find useful information like activity intensity, active time, calories burned and step count, which should be enough for most users.
Step tracking was accurate, although RingConn did seem to slightly under report compared to other devices. On one test day it recorded 5,167 steps versus 5,500 on the Whoop, a pattern I noticed in a few other comparisons.
Battery life is still one of RingConn's biggest strengths. The company claims between 11 and 14 days per charge, and in my testing the ring lasted nearly 12.5 days with both vascular insights and haptic alerts enabled.
That comfortably exceeds most rivals these days. For comparison, the Oura Ring 5 offers up to 7 days, the Samsung Galaxy Ring up to 7 days, while the Ultrahuman Ring Air and Circular Ring 2 both offer around 6 days.
For me, this is one of the RingConn's biggest selling points. The less often you need to remove a wearable for charging, the more likely you are to wear it consistently and collect uninterrupted data. RingConn also displays both remaining battery percentage and an estimate of days remaining in the map, which is a small but useful touch.
Overall, the RingConn Gen 3 delivers a strong experience. The app isn't quite as refined as Oura's, and some insights could go further, but the combination of comprehensive health tracking, clear data presentation, excellent battery life and a subscription-free model makes it one of the most compelling smart rings currently available.
Category | Comment | Score |
Value | There's no subscription and it undercuts major rivals. But not by all that much. | 3.5/5 |
Design | It's lightweight, comfortable and has a non-standard squared circle design. Nice glossy finish with several more available in this version too. There's no wearing indicator and sizing might differ this time around. | 4.5/5 |
Features | A solid set of health and wellbeing features. Vascular insights are welcome, though not intuitive to use — you'll need a separate cuff. Otherwise, it is pretty similar to the Gen 2 that came before it. | 4/5 |
Performance | Solid insights presented simply in the app. Which is a little less refined than rivals, but easy to use. The battery life is standout and I found myself really engaging with the data rather than forgetting to check — a testament to a solid experience. | 4/5 |
You don't want to pay a subscription
All of the features on offer here are free, which sets it apart from rivals like Oura that charge a monthly fee.
You want a light and comfortable smart ring
It's very easy to wear, even at night. And despite reported changes to sizing, I got the size I usually wear with no issues.
You want general health insights
Look, smart rings are not the last word in fitness tracking. There's some of it here but they're best at general health insights and an overall picture of your wellbeing.
You have the Gen 2 or Air
Yes, there are some significant improvements here, but not everyone would be able to justify an upgrade. It depends whether the changes are a priority for you.
You want to save money
Compared to rivals, it's solid value. But there are now cheaper options that might not beat the RingConn Gen 3, but do the basics well.
You're considering Oura
As you'll learn below, Oura is pricier with a monthly subscription. But it is an elevated experience over RingConn in most ways.
Oura Ring 5
The Oura Ring 5 is here and it's one of the best choices out there, especially now the latest version is even slimmer than previous iterations. We rated its improved design and comfort in our recent review. Yes, it's more expensive than the RingConn Gen 3 and you'll need to add on the recurring monthly subscription. But if it's the most advanced smart ring you're after and you're willing to pay for it, take a look at the Oura Ring 5 instead.
Read our full Oura Ring 5 reviewView Deal
RingConn Gen 2
I know, I know. This is the older model, but it's been significantly reduced now the Gen 3 is here. Which makes it even better value. Granted, you're not getting the improved battery life, extra finish options, upgraded tracking and vascular insights. But if saving money is a priority, you find a good bargain and you don't need the latest tech, it's a solid choice in my books.
Read our full RingConn Gen 2 reviewView Deal
I tested the Ringconn Gen 3 for just over 2 weeks. I wore it all day and all night, only taking it off to either charge it or lift weights — I've learned many times in the past that smart rings are very easy to scratch with metal dumbbells. The smart ring was on throughout workouts, while I was working, out socializing, relaxing on an evening and sleeping at night.
I've been reviewing smart rings since the very first version of the Oura ring came out back in 2017. Since then, I've tested almost every generation from every smart ring brand that came after it. This puts me in a solid position to not only test the newest rings, but compare the models, tell you which one might be right for you and bring you loads of context about the smart ring space.
The Garmin Cirqa is making waves in the fitness community. I put the new screenless tracker through its paces over 10 days of intensive testing, and awarded it 4.5 stars in my Garmin Cirqa review. As part of the testing process, I wore it for all of my workouts over the past couple of weeks — and, unusually for a device I've been testing for review purposes, I'm still wearing it now.
I normally alternate between an Apple Watch Ultra 3 or a Garmin Fenix 8, but I've found myself loathe to ditch the Cirqa just yet. This isn't only because it's good: I'm gravitating towards the Cirqa because it interfaces with a system I already use, and because it's helping me get over the dreaded "Strava-itis".
Last month, our writer Becca Caddy wrote about optimization culture — how wearables are causing us to engage in unhealthy mindsets and disordered behaviors. I can certainly attest to that: I'm guilty of glancing at my watch during a run, wanting to push my pace even on zone 2 sessions and easy days, because I know the end results are going to end up on my Strava account for all to see.
Even uncoupling my watch from automatically uploading my run to Strava is only half the battle. I'm constantly glancing at the watch to check my pace and time, engaging in subconscious judgement, comparing my own performance to that of my mates, colleagues and acquaintances. I didn't realize quite how much my self-judgement was sapping my enjoyment of exercise.
The Cirqa, and to some extent the Google Fitbit Air I tested earlier in the year, goes some way to changing all that.
While the Cirqa offers up some fitness and wellness metrics (certainly plenty to understand the effect of exercise on your body and health), what it doesn't give you is workout specifics. You won't find split pace per kilometer, for example, which runners use to measure average speed across a distance run, or heart rate zones to display a workout's intensity. With other models, I get those statistics piped into my ears at regular intervals, and my watches offer them at a glance.
Having access to such statistics removed during the workout can be detrimental to performance or for those times you're training for a specific event, but it's oddly freeing for day-to-day fitness training. I ran a 10km route during the testing period (at least, I assume it was 10km based on previous runs) and the Cirqa recorded plenty of heart rate-based statistics and applied them to recovery metrics such as my Training Readiness Score, along with how it improved stats such as my VO2 Max and Fitness Age.
However, it informed me of these statistics after the run, and didn't deliver any specific run performance information at all beyond time and heart rate information. Without my watch to glance at during the workout, I wasn't adhering to a target pace: I was running on vibes and perceived effort.
I concentrated on how my body felt, and responded to that in the moment. I paid attention to my form, my music, the trees and the road. I didn't feel guilty about stopping to stretch part way through, nor did I pause the Cirqa for that particularly pause, as doing so would invalidate the whole "complete, holistic workout overview" thing it's got going on. For the first time in quite some time, I had no idea at all about how fast I had run — but I knew that it was a good workout as a result of every other metric and the fact that I felt awesome.
Although it isn't a running-specific device, the Cirqa is exactly what I needed to reinvigorate my relationship with the road. When the time returns to take my training seriously again, taking speed and times on board again, I'll switch back to my best Garmin watch, with all my fitness stats ready to be incorporated into Garmin's workout plans.
Do you run without a fitness tracker, or use a screenless model, to better run on vibes, or are you a metrics-fiend with a dedicated running watch? Let me know in the poll below.
In a groundbreaking advancement that promises to reshape the landscape of wearable technology and soft robotics, researchers at the Korea Advanced Institute of Science and Technology (KAIST) have developed a pioneering self-powered piezoelectric fiber sensor exhibiting unprecedented stretchability and resilience. This novel device, capable of enduring elongations up to 668%, heralds a new era of flexible sensors that can reliably monitor physiological signals over extended periods without relying on external power sources such as batteries.
Wearable medical devices designed to continuously track vital signs—heart rate, respiration, and joint movement—have long been limited by the mechanical and electrical degradation of their sensing components under repeated deformations. Traditional piezoelectric fiber sensors, which convert mechanical forces into electrical signals, often suffer from diminished performance as their thin electrode layers and fragile piezoelectric materials falter during routine bending and stretching. Overcoming this barrier, the KAIST research team led by Professor Miso Kim has introduced a transformative approach that stabilizes sensor function even after thousands of mechanical cycles.
Central to this breakthrough is the adoption of a meticulously engineered “Hierarchical Resilient Design,” wherein resilience is embedded across multiple structural levels of the sensor. This concept mirrors the elasticity of a rubber band, allowing the piezoelectric fibers to recover their original form and function after extensive stretching. The research team achieved this by dispersing elastic polymer microparticles within the piezoelectric nanofibers, creating a Velcro-like interlocking microstructure that enhances the sensor’s mechanical robustness and self-restorative capabilities.
The interface engineering between the sensor’s electrical components also proved critical. By enhancing the bonding between the piezoelectric layers and the electrodes, the team prevented delamination—a common failure mode under deformation—that typically degrades signal integrity. This strong adhesion at the material interfaces ensures continuous charge transfer and maintains stable electrical outputs even when the sensor is twisted, pressed, or stretched significantly.
One of the most remarkable aspects of the sensor’s design is its coil and knot structures. By coiling the piezoelectric fibers, the researchers capitalized on geometric extensions, enabling the sensor to stretch over six times its initial length without losing sensitivity. Furthermore, knot configurations were tested to validate sensor durability under complex and dynamic mechanical stresses such as sudden impacts or localized pressure, demonstrating stable electrical signals regardless of deformation mode.
Beyond mechanical resilience, the KAIST team integrated artificial intelligence techniques to interpret the electrical outputs from the sensor. Utilizing machine learning algorithms, they could accurately distinguish between distinct mechanical stimuli—such as bending, stretching, and pressing—offering a valuable platform for intuitive and precise biosignal monitoring in real-world environments. This capability opens new horizons for dynamic human-machine interfacing, where nuanced movement detection is critical.
What sets this breakthrough apart is its self-powered nature. Unlike conventional wearable sensors that depend on finite battery life, the piezoelectric polymer fibers harvest mechanical energy directly from body movements, converting it into usable electrical signals. This sustainable mechanism not only eliminates maintenance concerns but also allows for ultra-lightweight, unobtrusive devices suitable for long-term wear.
The implications of this technology extend well beyond healthcare monitoring devices. Electronic skins capable of mimicking human sensory reception, soft robotic actuators with sensitive feedback loops, and next-generation digital health tools could all benefit from the combination of stretchability, mechanical resilience, and stable self-generated electrical outputs demonstrated by this platform. Such multifunctional usability places this development firmly at the forefront of flexible electronics innovation.
Professor Miso Kim emphasized the significance of their approach: “By simultaneously achieving mechanical resilience and electrical reliability through fiber structure design combined with precise electrode interface engineering, we have laid the foundation for wearable devices capable of long-term operation under strenuous conditions,” she remarked. This robust design paradigm, she asserts, will empower a new generation of devices that continuously monitor biosignals with unprecedented accuracy and durability.
Published in the prestigious journal ACS Nano, the team’s research showcases both fundamental materials science and applied engineering excellence. The paper titled “Mechanically and Functionally Resilient Piezoelectric Fiber Coils and Knots for Reliable Self-Powered Sensing” details the synthesis of the nanofiber composites, the meticulous fabrication of coil and knot geometries, and a comprehensive analysis of the sensor’s electromechanical performance over extensive cyclical tests.
The scientific community has lauded this work for addressing long-standing issues in flexible sensor design. By merging nanoscale material innovations with macrostructural strategies, the KAIST team has created a versatile sensing platform that bridges the gap between laboratory prototypes and real-world applications. Their work sets a precedent for future interdisciplinary efforts aimed at wearable electronics that demand both high performance and durability.
Funded by multiple National Research Foundation of Korea initiatives, this research underscores Korea’s growing leadership in advanced materials and smart sensor development. The integration of elastic polymer microparticles within piezoelectric nanofibers, combined with interface science and architectural engineering, exemplifies the kind of holistic approach necessary to push boundaries in next-generation electronics.
Looking ahead, this resilient, self-powered fiber sensor technology could transform how we collect and interpret physiological data in ambulatory settings, enable more sophisticated prosthetics with tactile feedback, and empower soft robots with human-like sensory capabilities. As devices become lighter, more adaptable, and energy-autonomous, the convergence of materials science and artificial intelligence will accelerate innovations that make previously impossible applications a reality.
In conclusion, the KAIST team’s pioneering piezoelectric fiber sensor offers a robust and reliable solution to historic challenges in wearable sensory technology. Its remarkable combination of extreme stretchability, stable electricity generation without batteries, and intelligent signal analysis marks a significant leap forward that is poised to impact multiple sectors, from healthcare to robotics and beyond.
Subject of Research: Development of highly stretchable, mechanically resilient, self-powered piezoelectric fiber sensors for wearable devices and soft robotics.
Article Title: Mechanically and Functionally Resilient Piezoelectric Fiber Coils and Knots for Reliable Self-Powered Sensing
News Publication Date: June 18, 2026
Web References: https://doi.org/10.1021/acsnano.5c19628
References: Choi, Y. J., Park, J., Nam, J., Sim, G.-D., Kim, M.-G., & Kim, M. (2026). Mechanically and Functionally Resilient Piezoelectric Fiber Coils and Knots for Reliable Self-Powered Sensing. ACS Nano.
Image Credits: KAIST
Self-powered sensor, piezoelectric polymer, wearable medical devices, stretchable electronics, fiber coil sensor, interface engineering, mechanical resilience, electrical stability, nanofiber composites, artificial intelligence, biosignal monitoring, flexible sensors.
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