Smart rings are emerging as the coolest wearable tech. However, with the growing number of worthy contenders in the market, it is becoming difficult to choose the right one. But I, a smart ring enthusiast, have taken it upon myself to review and compare each of these rings with each other and choose the victor.
For this post, I compared Amazfit Helio and Evie Ring across several parameters, such as their design, nitty-gritty functionalities, sleep tracking accuracy, battery life, and more.
And well…. I liked Amazfit better. Curious to know why? If yes, then keep scrolling, my findings from these tests are shared below and they will explain why and how I arrived at this.
Design & Colors
First impressions are important. And while both the Amazfit Helio and the Evie Ring offer great first impressions, they are pretty different in their looks.
The Helio takes a more traditional approach to its design. It comes with a completely circular body with a dotted texture. Whereas, the Evie ring has one of the most unique designs I have seen in any ring.
It features an open-ended design with a cut at the top. The exterior of the ring is sleek and smooth. Believe me when I say that the surface of my Evie ring is so shiny that light reflects off it at times.
I got the Amazfit Helio ring in titanium—the only one available at the moment. But the ring is still not exactly titanium; it has a warm, pale gold tint. The color, design, and the name of the ring (Helio stands for “sun” in Greek) give me Greek mythology vibes, which I absolutely love. I guess this is why I don’t mind the lack of color options at all.
Whereas Evie provided me with three beautiful color options to choose from— silver, gold, and rose gold. Since I already had Amazfit Helio in a color similar to gold, I wanted to try something different and, therefore, chose the Evie Ring in silver. To me, this combination felt like wearing the sun and moon on my fingers— quite stylish. You should know by now that I am quite poetic.
As you can see, both the Amazfit Helio and the Evie Ring, although equally impressive in their designs, cater to very different aesthetics. I liked Amazfit Helio better simply because of my *ahem* liking *ahem* of Greek gods.
Material, Comfort & Durability
The makers of Amazfit Helio and Evie Ring really had their users’ comfort in mind while crafting their respective designs. Both have been made with materials that ensure user comfort.
The exterior of Amazfit Helio is made of Titanium alloy, and the inside part of the ring has a resin covering. The resin on the inside makes the ring quite comfortable to wear since the sensors don’t dig into my finger.
In fact, forget digging, I could barely feel the ring there! Because not only is it comfortable, it’s incredibly light weight (3.75 & 3.82) and thin (2.6mm thick and 8mm wide). Given the thinness, it never looks and feels bulky on my finger.
Unlike the Amazfit Helio ring, you will easily notice the Evie Ring on my finger. It’s 3 mm thick and 8 mm wide, and in comparison to the Helio ring, it does look a bit bulky. Since I’d rather prefer my smart rings to be a little discreet, I do mind the fact that Evie Ring sticks out like that.
But this doesn’t mean that my Evie is uncomfortable. No, not at all. The open-cut design is not just for the looks of it. Evie is specially designed to cater to Women’s Health, as the makers like to put it, and the cut at the top is there to accommodate swollen fingers due to hormonal changes.
As a woman, my fingers tend to get swollen sometimes, but the open cut at the top ensures that my ring fits me just right, even during such times, so that I never feel uncomfortable. Truly enough, I don’t.
Furthermore, being around the same weight as the Helio ring (approximately 3.5 grams) and made of liquid metal, I found the Evie ring to be just as lightweight as the latter.
However, the same can’t be said about their durabilities. I am a clumsy person. This means that the rings I wear get to go through a lot, which really puts their durability to the test.
For example, the other day, I accidentally fell down while cycling, and while the Helio ring fared fine with just a few abrasions, I noticed that the Evie ring had a few scratches— despite the PVD coating it has on top.
So, when it comes to comfort and durability, I prefer the Helio ring over the Evie. Even though the Evie ring has an open-cut design, the Helio is simply more comfortable to be worn at all times, especially during the night. I don’t feel it there at all! Plus, it’s more durable than Evie.
Battery Life & Charging
| Charging Details | Amazfit Helio Ring | Evie Ring |
|---|---|---|
| Official Ring Charging Time | 100 minutes | 60 minutes |
| My Ring’s Charging Time | 100- 120 minutes | 50-90 minutes |
| Official Battery Durability | Up to 4 days | 4+ days |
| My Ring’s Battery Durability | ~4 days | 3-4 days |
I found the battery life of the Amazfit Helio ring and the Evie Ring to be about the same. Helio advertises up to 4 days of battery life, but during my time with the ring, I only got about 3-4 days of battery life.
Furthermore, when I had some fancy options like Auto Emotion Monitoring enabled, the battery depleted even more quickly. Sometimes, it lasted only 2-3 days. However, given that I dislike having to charge my devices frequently, I disable unnecessary features so that I can enjoy a longer battery life.
Similarly, Evie promises up to 4+ days of battery life, whereas, in my experience, I only got around 4 days. See? Similar to Helio.
However, when it comes to charging, there are some notable differences between the two rings. To charge my Amazfit Helio, I have to put it on the charging dock and then connect the dock to a power source via a USB C cable. The total charging takes around 120 minutes.
When it comes to Evie, once the battery is completely depleted, a full charge takes around 60-90 minutes. But because I put my ring in the charging case for 20 minutes or so here and there, it ensures that my ring is never completely out of charge.
Furthermore, charging my Evie ring on the go is possible because, unlike Helio, the Evie comes with a portable charging case. This means I only have to put it in the case and leave it there until it has been charged. The case can support up to 8-10 charges (with the promised claim being 10+ charges). But it’s okay. I still love how convenient it is to charge my Evie Ring.
As you can already tell, I really prefer the Evie ring over the Amazfit Helio when it comes to charging and battery life. Evie’s charging experience is hassle-free, and the battery is slightly better than Helio’s.
Sensors
Both the Amazfit Helio and Evie Ring come with really advanced sensors for tracking and monitoring health-related metrics. While most of the sensors the two rings use are the same (as you can already tell from the table), there are some significant differences in their sensor technologies, too.
| Sensors | Amazfit Helio Ring | Evie Ring |
|---|---|---|
| PPG Sensors |  |  |
| Skin temperature Sensor |  | |
| Photodiodes | | |
| 3D Accelerometer | | |
| Gyroscope | |  |
| Infrared LED | | |
| Green LEDs | | |
| Red LEDs | | |
| EDA Sensors | | |
When it comes to detecting movement, Amazfit Helio uses a Gyroscope sensor, whereas the Evie ring lacks it.
Furthermore, the Evie app requires me to log my moods in the mood journal that the app contains to get an idea of my emotional states, whereas the Amazfit Helio ring comes with EDA sensors that are especially there for this job.
Accuracy
I’ve almost never had a smart ring give me as accurate data as the Oura does. Regardless of that, I went into testing the accuracy of the Helio and Evie ring with a heart full of hope. I wanted at least one of them to provide me with highly accurate data, but well, hope is a terrible thing to have.
Sleep Tracking
The sleep-related data of the Helio ring matches that of other smart rings I tested in terms of sleep score, sleep duration metrics, and HRV. This is because Helio uses sensors that are more advanced than the Evie ring’s.
Furthermore, the ring’s companion app, the Zepp app, was able to provide me with some highly accurate insights into my sleep based on the data tracked. I found the insights to be particularly helpful for improving my sleep.
However, the data that Helio provided me about the time spent in different sleep stages wasn’t as accurate as that I used to see in other rings like Oura.
Evie was just about the same in terms of sleep data. While both the rings showed me accurate total duration, neither got the sleep stages right. Evie almost always showed me a lower duration in sleep stages. Furthermore, I sometimes detect minor discrepancies in sleep onset times compared to Amazfit Helio.
So clearly, I would trust the data that Helio provides when it comes to sleep tracking.
Activity Tracking
Both the Amazfit Helio and the Evie Ring require me to manually log my workouts in the respective companion apps. Even though I’d do that, I’ve seen that the Evie Ring doesn’t give me the option to select the kind of workout I am doing. With Helio, I could select from four different kinds of activities: walking, running, cycling, and treadmill workouts.
While this is not enough since so many other kinds of activities, like strength training, HIITs, swimming, etc., go unaccounted for, it’s still loads better than what Evie offers— only the duration of my workout.
Furthermore, it’s common for many smart wearable devices to not be able to track steps accurately. So, I wasn’t surprised when neither of the two rings could under/overcount my steps. But even here, the Evie ring showed more activity-related data inaccuracies than Helio did.
Does this mean Helio did a good job?
Hell, no.
A friend of mine who also uses Amazfit products suggested that I use Amazfit GTS to track my steps and activity during the day, since it’s more accurate for that, and only wear the ring at night for tracking my sleep. The Zepp app would sync my data from both the wearables anyways. But, if I wanted to end up with a fitness band, then why would I ever get Helio in the first place?
Heart Rate Monitoring
Amazfit Helio provided me with near-accurate heart rate data. What I got from Helio was in accordance with the kind of data I had seen in the Oura ring or even the Garmin watch. Helio also managed to capture my average and maximum heart rates during my runs, which I was quite impressed by.
However, the RHR that Helio provided me with wasn’t accurate; it was higher than what I usually see in the Oura Ring.
When it comes to the Evie Ring, I was quite impressed when I found out that Evie has applied for FDA clearance for its pulse oximeter, which tracks heart rate and SpO2. If the clearance is given, Evie could very well be a medical-grade device.
But, even during the testing phase for arterial blood gas levels, the Evie rings being tested achieved a root mean square error (RMSE) average of 2.46%. This number is lower than the FDA guidance of 3.5% for SpO2.
So, naturally, I went into testing the heart rate monitoring accuracy of the Evie ring with great optimism.
And well, I wasn’t disappointed. Evie’s heart rate monitoring data was quite impressive. The numbers that I got were similar to what the Amazfit Helio was showing me, thereby being in accordance with what other smart wearables like Oura and Gramin had shown.
Specifications
| Specifications | Amazfit Helio Ring | Evie Ring |
|---|---|---|
| Material | Titanium Alloy (outer ring), Resin (inner part of the ring) | Liquidmetal®, a zirconium-based amorphous alloy with a titanium PVD coating |
| Weight | 3.75 & 3.82 grams | 3.2-3.7 grams |
| Thickness | 2.6mm | 3mm |
| Width | 8mm | 8mm |
| Size | 10 &12 | 5-12 |
| Charger | Wireless charger | Portable charging case (up to 10 charges). Charger battery charging time: 60 minutes max, depending on the starting charge level |
| Battery Life | Up to 4 days | 4+ days |
| Ring Charging Time | 1 hr 40min | Up to 60 minutes |
| Colors available | Titanium | Silver, gold, rose gold |
| Connectivity | Bluetooth | Bluetooth |
| Compatible With Other Apps | Yes | No |
| Water Resistance | 10 ATM/ 100m | Up to 1M; IP57 |
| Memory | N/A | Up to 7 days |
| Compatibility | Android 7.0 and above, iOS 14.0 and above | iOS v16 or above |
| Warranty | 1-year | 1-year |
| In-built GPS | Yes | No |
| Operating Temperature | 0°C to 40°C | -20° to 35° C (-4° to 95° F) |
| EMF-Safe | No | Yes |
| Airplane Mode | No | Yes |
| Sizing kit | No | Yes (Free) |
| FSA/HSA Eligible | No | Yes |
Features
| Features | Amazfit Helio | Evie Ring |
|---|---|---|
| Heart Rate | Yes | Yes |
| Heart Rate Variability (HRV) | Yes | Yes |
| Resting Heart Rate | Yes | Yes |
| Workout Heart Rate | Yes | No |
| Blood oxygen levels (SpO2) | Yes | Yes |
| Spot Check | No | Yes |
| Sleep tracking | Yes | Yes |
| Nap detection | Yes | No |
| Detailed sleep analysis | Yes | No |
| Sleep Coach | Yes (Paid feature) | No |
| Weekly & monthly sleep reports | Yes | No |
| Respiration Rate | No | Yes |
| Breathing Quality | Yes | No |
| Skin Temperature | Yes | Yes |
| Steps | Yes | Yes |
| Distance Traveled | Yes | Yes |
| Calories | Yes | Yes |
| Activity Tracking | Yes | Yes |
| Workouts | Yes | Yes |
| Sports Coach | Yes | No |
| Active Minutes | No | Yes |
| Achievement Prediction | Yes | No |
| Advanced Running Support | Yes | No |
| Period Prediction | Yes | Yes |
| Fertility & Ovulation Prediction | No | Yes |
| Mood & Energy | No | Yes (Manual logging) |
| Menstrual Symptoms | No | Yes (Manual logging) |
| Emotional state | Yes | No |
| Daily Summary | No | Yes |
| Set Personalized Goals | Yes | Yes |
| Personalized Wellness Assistance | Yes | Yes |
| PAI health assessment system | Yes | No |
| AI Chatbot | Yes | No |
| Insights Feature | Yes | Yes |
| Data Export | Yes | No |
| Stress Score | Yes | No |
| Recovery | Yes | Yes |
| Readiness Score | Yes | No |
| Readiness Insights | Yes | No |
| VO2 Max | Yes | No |
Readiness Score
A Readiness score is something that I have come to blindly trust when it comes to deciding what amount of work and exercise I should do on a particular day. Even though I know these scores are superficial, they still are a motivator at times.
However, while Helio does provide me with a Readiness score and Evie doesn’t, I have often found Helio’s scores to be inaccurate. It shows scores lower than what they are. A normal person would give up exercise for the day, but I, knowing better than that, didn’t skip my workout based on a score as such.
Regardless of that, having inaccurate Readiness scores can be a hindrance to workout plans; it makes me feel that it’s better not to have a score as such at all.
Mood Tracking
Furthermore, while both the rings allow me to track my moods and emotions, Helio uses EDA sensors, whereas Evie needs me to log my mood and symptoms throughout my cycle.
Basically, I have to depend on my (in)ability to tell the Evie app how I feel. I can use adjectives like “calm,” “depressed,” “anxious,” etc., and while having these adjectives to choose from does make things easier, I’d still have preferred something like EDA sensors to do the job for me.
With the Zepp app, I only have to confirm if what the ring has observed about my mood/emotional state is correct or not. I did it for the first two weeks, and after that, the ring itself started showing me correct observations.
Menstrual Tracking
Both Amazfit Helio and the Evie ring require users to log in their menstrual symptoms, start and end dates of their periods, etc., for at least 3-4 months to be able to get predictions and insights.
But, the problem here was that I only got the Helio ring around a month ago or so, and therefore, I haven’t come around to trying out its menstrual tracking feature properly. However, I’ve had the Evie ring for way longer, and after around four months of diligently logging in my period symptoms, cycle length, and other things, the Evie app did start showing me my cycle-related information and predictions.
Recovery
When I was going through Amazfit Helio’s website, I noticed that they kept focusing on the word “recovery”. It seemed to me like Helio puts an extraordinary focus on recovery, and well, it does.
Helio provides me with things like in-depth sleep analysis, mental and physical readiness analysis, Sleep RHR, and HRV tracking just so that I can have an idea of how well I have rested and how prepared I am for one thing or another.
As someone who’s focused on wanting to get better at running, having this kind of recovery metrics and analysis helps me prepare myself better for my runs.
Companion Apps
I was overwhelmed as soon as I opened Helio’s companion app, Zepp. A lot of data about my health, such as different scores about a bunch of different things, heart rate, etc., were packed in a small space on the home screen itself.
While I understand that the app’s makers would have done this so that users could open the app, quickly scroll through the home screen, and have all their data at a glance, I still wish they had paid a little more attention to the layout.
Like, I wish Helio had tried making their app as colorful as Evie’s. As soon as I open the latter, my eyes are pleased to see the app’s aesthetic dark purple and beige layout (with my device’s dark mode). Instead of overwhelming me with a lot of data at once, Evie takes a more interactive approach and presents me with all my health-related data in these really cute, colorful circles.
However, the Zepp app provided me with more in-depth data than the Evie app did. At the bottom of the Zepp app are four tabs— Home, Sleep, Workout, and Profile. The names are quite self-explanatory, and I can scroll through them to get more detailed information about these respective data. Health-related trends and other kinds of information are presented in the form of charts and graphs that are quite simple to interpret.
So, while the Zepp app was quite overwhelming at first, I became well acquainted with it over time. In fact, I started finding the data that it presented to be more detailed and helpful than what the Evie app shared.
Evie app’s home page has four tabs at the bottom— Today, My Body, Sleep, and Journal. The “Today” tab would show me a quick recap of how my day went, my progress on the personalized goals I have set for myself, like the steps I decided to walk, etc. My Body shows me a bunch of health-related metrics like heart rate, stress, etc. The Sleep tab is all about my sleep hygiene, and the Journal tab is where I log things like my menstrual cycle dates, my moods, etc.
While all of this data is useful, too, I simply prefer the detailed insights that Zepp offers.
Plus, did I tell you that the Evie app is only available for iOS users and not Android ones?! I believe if Evie wants to appeal to a wider customer base, then it should launch an Android app ASAP.
Prices, Subscription & Availability
In comparison to other smart rings I have purchased, like the Oura, I have found both the Helio and Evie rings to be affordable.
| Pricing Details | Amazfit Helio | Evie Ring |
|---|---|---|
| Official Price | $299.99 USD | $269.00 USD |
| Discounted Price | N/A | N/A |
| Subscription | Yes (Optional) | No subscription |
I got the Amazfit Helio for $299 and the Evie Ring for $269. On the surface, it looks like there’s just a $30 difference between the two, but it isn’t so. There’s actually more difference both in terms of price and value.
Amazfit Helio’s companion app, Zepp, is free to download and use. However, Zepp also offers a subscription to Zepp’s Aura in-app feature. But, instead of paying for the subscription, I signed up for a free trial for a limited period.
Unlike the Zepp app, Evie Ring’s companion app is completely free to download and use. As of now, there is no premium version or special paid features, and it works fine for me. I am usually not looking forward to paying extra, either.
Furthermore, Amazfit Helio only comes in two sizes—10 and 12—and only one color, and given this backdrop, the $299 price tag looks unreasonable. Evie, on the other hand, offers a lot more at $269— a free app, a sizing kit, a variety of sizes, and beautiful color options, too.
But again, while the Evie ring may be cheaper in the beginning, Amazfit Helio provides way more value in the longer run.
Final Verdict
With all this being said, I hope you now get why I liked Amazfit Helio better. It looked and felt better on my finger and came with more advanced sensors. Helio also offers more features than Evie Ring does.
While I am not exactly happy and satisfied with the data accuracy of either of these rings, Helio proved to be marginally better. And so, if I had to pick a ring from the two on the basis of data accuracy, I know I’d get Helio.
Furthermore, I know I found the Zepp app overwhelming at first, but after using it, I found it to be so much more insightful than the Evie app. With all of this in mind, the price and optional subscription pricing of the Zepp app are justified. So yes, I like Helio better.
