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If you’re trying to find the best smart ring for ovulation tracking, here’s the fast answer:
- Best overall: RingConn Gen 2
- Best for iPhone + deep sleep insights: Oura Ring 4
- Best for Galaxy/Android guys: Samsung Galaxy Ring
- Best for performance & recovery nerds: Ultrahuman Ring Air
- Best budget, no-subscription pick: RingConn Gen 2 Air
Why this matters: ovulation is the event that decides your fertile window. If you’re trying to conceive, managing symptoms, or just understanding your hormones better, choosing the right smart ring can mean the difference between vague period guesses and data-backed insights—but none of these are medical devices or birth control.
Best Smart Ring for Ovulation Tracking: Comparison Table
| Products | Oura Ring 4 | RingConn Gen 2 | Samsung Ring | RingConn Gen 2 Air | Ultrahuman Ring Air |
|---|---|---|---|---|---|
 |  |  |  |  | |
| Best For | Best for: Overall smart ring for women | Best value & sleep apnea awareness | Best women-focused health & cycle | Best lightweight budget choice | Best for recovery & metabolic focus |
| Subscription | No | Yes (monthly) | No | No | No |
| Battery LIfe | ~12 days | Up to ~8 days | ~10–12 days | Mid-range | ~10 days |
| Charging | charging case | Tabletop dock | Portable charging case | Dock | Dock |
| Health | Sleep apnea + general wellness | General wellness, sleep, activity | Sleep, readiness, activity trends | Recovery, stress, metabolism | Sleep + activity + Galaxy AI |
| Look & Feel | Thin and minimal | Most jewelry-like | Ultra-thin, minimal | Open, adjustable band | Slim, simple |
| Price |  | | | | |
If you want the best smart ring for ovulation tracking, I’d choose Oura Ring 4. Its Cycle Insights and ovulation prediction algorithm are validated in peer-reviewed research and updated in 2025 to detect about 96% of ovulations with an average error of ~±1.3 days, significantly outperforming simple calendar methods.
If you have irregular cycles or want more “fertility clinic–style” tools, Ultrahuman Ring Air is my next pick thanks to its dedicated Cycle & Ovulation PowerPlug and newer Cycle & Ovulation Pro feature that are built around biomarkers like temperature, HRV and resting HR, plus tech acquired from a clinical fertility platform.
Evie Ring and Samsung Galaxy Ring both offer temperature-informed cycle predictions and fertile windows in a more mainstream, everyday package, while RingConn Gen 2 is more of a general health ring whose accurate temperature and sleep trends can support ovulation awareness even though it’s not fertility-focused.
Big caveat: none of these rings are FDA-cleared contraception or fertility treatments. They’re wellness tools. Always double-check with a doctor or dedicated fertility solution before making medical decisions.
Product Comparisons
1. Ovulation Accuracy & Fertility Features
Oura Ring 4 – Algorithm-Backed Ovulation Detection
Oura has gone all-in on cycle insights, period prediction, fertile window, and pregnancy insights. Their updated Cycle Insights algorithm (late 2025) was trained on tens of millions of nights of sleep data and reports ovulation prediction accuracy above 96%, with an average error of around ±1.26 days in validation work.
Oura uses continuous nighttime temperature trends plus other biometrics to detect the post-ovulation temperature rise and refine predictions over time. It also integrates with Natural Cycles, giving you a more formal fertility-tracking workflow if you choose that route.
Ultrahuman Ring Air – PowerPlugs for Fertility & TTC
Ultrahuman has built specific tooling for ovulation:
- Cycle & Ovulation PowerPlug (free): uses temperature, HRV, and resting heart rate to estimate cycle phases and a 7-day fertile window, plus an ovulation day estimate.
- Cycle & Ovulation Pro (paid add-on): built from viO/OvuSense tech with ~15 years of fertility-monitoring research, positioned as “the most accurate cycle tracking on any smart ring,” especially for non-28-day and irregular cycles.
For people with PCOS, endometriosis, or very irregular cycles, that emphasis on off-template cycles is a big plus.
Evie Ring – Women’s-Health-First Fertility Window
Evie is marketed explicitly as “the smart ring for women’s health.” Its app uses your cycle length and last period date to estimate future periods, fertile windows, and ovulation dates, with a calendar view plus symptom tracking to refine things over time.
Reviewers note that Evie’s ovulation and period predictions work, but the app and data feel more “first-generation” than Oura or Ultrahuman. Still, if you want a ring that frames everything around women’s health and fertility rather than general wellness, it’s a strong contender.
Samsung Galaxy Ring – Cycle Tracking Inside Samsung Health
Galaxy Ring leans on Samsung Health’s cycle tracking. Samsung uses period entry plus nighttime skin temperature to predict upcoming periods and cycle phases, with clear disclaimers that predictions are for wellness only and not for contraception or medical decisions.
It’s not as fertility-specialized as Oura or Ultrahuman, but for many people it’s “accurate enough” and nicely integrated into a phone ecosystem they already use.
RingConn Gen 2 – Solid Cycle Signals, Not a Fertility Specialist
RingConn Gen 2 doesn’t market specific ovulation or TTC tools, but it does provide:
- High-resolution skin temperature trends
- Detailed sleep + HRV + resting HR + SpO₂ data
That combo can still support ovulation awareness when paired with a period app or manual tracking, especially if you want to watch for the post-ovulation temp shift yourself. It’s a great health ring that can complement fertility tracking, even if it’s not framed as a fertility device.
2. Daily Wear, Comfort & Design
All five rings are designed for 24/7 wear, but they lean toward different aesthetics:
- Oura Ring 4: sleek band in multiple finishes (including Gold and Rose Gold), widely seen as the most “jewelry-like” of all smart rings.
- Ultrahuman Ring Air: ultra-light, minimal profile focused on sleep comfort; easy to forget it’s on.
- Evie Ring: open adjustable band purpose-built for women’s hands and swelling changes.
- Samsung Galaxy Ring: titanium, concave design with a tough, “techy but classy” look, especially in Black.
- RingConn Gen 2: ultra-thin, low-profile design with long battery life that makes it ideal for people who never want to take their ring off.
For ovulation tracking specifically, comfort during sleep and battery life both matter—a ring in a drawer is useless for fertile window prediction.
3. Apps, Cost & Privacy Around Fertility Data
- Oura Ring 4: requires a monthly membership for full cycle and ovulation features. You’re paying for a mature app, validated algorithms, and integrations (like Natural Cycles), but there is an ongoing cost.
- Ultrahuman Ring Air: base sleep and cycle tools are available without a general subscription, but Cycle & Ovulation Pro is a specific paid add-on for deeper fertility features.
- Evie Ring: no subscription. Fertility windows and ovulation estimates are included in the base price, which is appealing if you want a women-centric platform without ongoing fees.
- Samsung Galaxy Ring: runs through Samsung Health with no extra ring-specific subscription; however, your data is tied closely to the Galaxy ecosystem, so that’s something to weigh if privacy and portability are big concerns.
- RingConn Gen 2: no subscription and a strong privacy stance; you pay once for the hardware and get all metrics. Fertility-specific features are limited, but as a low-cost, high-data companion to a fertility app, it works well.
Pros & Cons of Each Ring for Ovulation Tracking
Oura Ring 4
Pros
- One of the best validated ovulation detection algorithms in the consumer space
- Cycle Insights with period prediction, fertile window, and pregnancy-related features
- Integrates with Natural Cycles for more formal fertility tracking
- Mature, polished app and huge user base
Cons
- Requires a monthly membership for full women’s health features
- Not a medical fertility device (and not contraception)
- Cost adds up over several years
Ultrahuman Ring Air
Pros
- Dedicated Cycle & Ovulation PowerPlug and optional Pro mode for conception focus
- Uses multiple biomarkers (temperature, HRV, RHR) for cycle phase and ovulation estimation
- Strong messaging and tooling for irregular cycles (PCOS, endometriosis, etc.)
- No general subscription beyond the optional fertility add-on
Cons
- Some features are behind a separate Pro paywall
- Overall platform is still evolving compared to Oura’s long history
- Availability and legal/market status can vary by region
Evie Ring
Pros
- Built specifically for women’s health, not generic wellness
- Period, fertile window, and ovulation estimations right in the calendar view
- No subscription fees
- Open band design can be more comfortable during cycle-related swelling
Cons
- App and data interpretation feel earlier-stage than Oura or Ultrahuman
- Fertility tools rely more on cycle input + trends than deep biomarker modeling
- Less robust performance/fitness features if you also want training analytics
Samsung Galaxy Ring
Pros
- Temperature-based cycle tracking integrated into Samsung Health
- Simple experience if you already log symptoms in Samsung Health
- No extra subscription just for fertility features
- Strong hardware with a durable titanium design
Cons
- Ovulation and fertile window estimates are clearly labeled as wellness-only
- Most useful if you’re already a Galaxy phone user
- Less fertility-focused than Oura/Ultrahuman/Evie
RingConn Gen 2
Pros
- High-quality temperature and sleep data you can pair with fertility apps
- Long battery life makes it great for continuous night tracking
- No subscription; strong overall value
- Excellent general health and recovery metrics that support holistic TTC efforts
Cons
- No dedicated ovulation or fertile-window module
- You’ll likely rely on a separate fertility app or manual interpretation
- Not designed as a fertility/ovulation tool first
Major Differences & How to Choose
Here’s how I’d match a best smart ring for ovulation tracking to different real-world needs:
- You want the most validated consumer ovulation algorithm with a polished app:
→ Go with Oura Ring 4. - You have irregular cycles or want something closer to a fertility-clinic tool (especially for TTC):
→ Pick Ultrahuman Ring Air with its Cycle & Ovulation PowerPlug/Pro options. - You want a women’s-health-first ring with no ongoing fees:
→ Choose Evie Ring. - You already live in the Samsung ecosystem and want cycle tracking baked into your phone:
→ Samsung Galaxy Ring is the obvious fit. - You mainly want a strong health ring and plan to use a separate fertility app for precise ovulation tracking:
→ RingConn Gen 2 is the most practical long-term companion.
FAQs – Best Smart Ring for Ovulation Tracking
1. What is the best smart ring for ovulation tracking overall?
For most people, Oura Ring 4 is the strongest all-around choice, thanks to its validated ovulation algorithm, mature Cycle Insights, and integrations with tools like Natural Cycles.
2. Which smart ring is best if I have irregular cycles?
If your cycles are irregular (PCOS, endometriosis, stress, etc.), I’d look at Ultrahuman Ring Air, especially with its Cycle & Ovulation PowerPlug/Pro features designed to handle non-standard cycles and flag possible issues in your luteal phase or ovulation patterns.
3. Are these smart rings reliable enough to use as birth control?
No. All of these companies clearly say their cycle features are not medical contraception and shouldn’t be used alone to prevent pregnancy. Use them as awareness tools, not as your only method of family planning.
4. Which smart ring is best for TTC (trying to conceive)?
If you’re actively TTC, I’d look at:
- Ultrahuman Ring Air with its fertility-oriented PowerPlugs and Pro tools
- Oura Ring 4 paired with a dedicated fertility app or Natural Cycles
Evie and Samsung Galaxy Ring are fine for general awareness but aren’t as fertility-focused.
5. Can RingConn Gen 2 track ovulation?
RingConn Gen 2 doesn’t have a dedicated ovulation module, but it does give you detailed temperature and sleep data you can use alongside a fertility app. Think of it as a great sensor platform that supports ovulation tracking rather than doing it all itself.
6. What’s the single best smart ring for ovulation tracking right now?
If I had to name one, I’d still say Oura Ring 4 is the best smart ring for ovulation tracking, with Ultrahuman Ring Air as the top alternative for people with irregular cycles or who want more fertility-specific tooling.
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About the Author
At Trimflo, I’m obsessed with gear that actually changes your life, not just your home screen. From weighted vests to smart rings, every recommendation comes from digging into the research, comparing real-world tests, and weighing long-term cost and data privacy—so when you pick the best smart ring for ovulation tracking, you’re not just following hype, you’re choosing a tool that really fits your body and your goals.