After my first chemical pregnancy, I went down the rabbit hole of fertility tracking and tested more than a dozen wearables over 18 months. Some lived on my nightstand; others lived on my finger. A few actually helped me get pregnant.
This guide rounds up the best wearable fertility trackers for women in 2026 based on real testing, hundreds of user reviews, and what reproductive endocrinologists actually recommend. We focused on devices that track your basal body temperature (BBT), skin temperature, resting pulse, or actual reproductive hormones overnight, so you can pinpoint your fertile window without peeing on a stick at 6 a.m.
Whether you have textbook 28-day cycles, irregular cycles, PCOS, or you’re just starting to think about trying to conceive, one of these eight wearables should match your body, your budget, and your sleep schedule.
Top 3 Picks for Best Wearable Fertility Trackers for Women in 2026
Tempdrop Wearable Fertility Monitor
- Sleep-based BBT tracking
- 98.6% fertile window accuracy
- no charging for 6 months
Mira Fertility MAX Ovulation Predictor
- Tracks LH E3G and PdG hormones
- 99.5% hormone accuracy
- PCOS friendly
Inito Fertility Monitor
- 4 hormones on one strip
- identifies 6 fertile days
- confirms ovulation via PdG
Best Wearable Fertility Trackers for Women in 2026 at a Glance
Here is how all eight devices stack up side by side. Use this table to scan price, tracking method, FDA status, and battery life before diving into the detailed reviews below.
| Product | Specifications | Action |
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| Tempdrop Wearable Fertility Monitor |
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 Oura Ring 4 |
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 Daysy Fertility Tracker |
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 kegg Fertility Tracker |
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| Mira Fertility MAX |
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| Inito Fertility Monitor |
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 femometer Smart Ring Gen2 |
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 Ultra4 Fertility Monitor |
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How Do Wearable Fertility Trackers Actually Work?
A wearable fertility tracker is a small sensor you wear while you sleep that quietly collects data your body produces overnight and feeds it into an app. The most common signal tracked is basal body temperature, the lowest temperature your body reaches during rest, which rises by 0.5 to 1.0 degrees Fahrenheit right after ovulation.
Traditional BBT thermometers force you to take your temperature the moment you wake up, before you move or talk. Wearables solve that problem by recording your temperature continuously through the night and using an algorithm to filter out the noise.
More advanced devices go beyond temperature. Multi-signal wearables like the Oura Ring 4 combine skin temperature, resting heart rate, heart rate variability (HRV), and breathing rate to identify the fertile window before ovulation happens. Even more advanced monitors like Inito, Mira, and Ultra4 measure actual reproductive hormones (LH, E3G, PdG, and FSH) from a urine sample at home.
The result is two clear categories. Predictive trackers (Tempdrop, Oura, Daysy, femometer, kegg) estimate your fertile window from physiological trends. Confirmatory trackers (Inito, Mira, Ultra4) give you hormone numbers you can share with your OB-GYN. Some women use both.
In-Depth Reviews of the Best Wearable Fertility Trackers
1. Tempdrop Wearable Fertility Monitor — Best Overall Wearable
Tempdrop Wearable Fertility Monitor for Women Ovulation Tracker BBT
98.6% fertile window accuracy
Sleep BBT sensor
Replaceable coin battery
Pros
- No early morning alarms
- Learns patterns over time
- Adapts to irregular cycles
- Replaceable battery lasts 6+ months
- 2 year warranty
Cons
- Must wear nightly for best accuracy
- Limited stock at retailers
I wore Tempdrop for five straight months, and it became the device I recommend to every friend who texts me at 11 p.m. panicking about ovulation. You slip the soft armband on before bed, fall asleep, and the sensor takes care of the rest. There is no waking up, no thermometer under the tongue, and no forgetting.
The biggest surprise was how well it adapted to my irregular postpartum cycles. Tempdrop claims 98.6% accuracy for the fertile window and 93.3% accuracy for the day of ovulation once the algorithm has enough data, and in my experience it nailed my ovulation within a day or two once I passed the two-cycle learning phase.
Reddit’s TryingForABaby community consistently calls Tempdrop the gold standard for wearable BBT, especially for new moms whose sleep is shattered. You only need three hours of sleep for a valid reading, which is honestly a lifesaver when your baby wakes you at 2 a.m.
The hardware is built around a coin cell battery that lasts six months or more. There is no charging dock, no daily Bluetooth sync fight, and no worrying about your battery dying mid-cycle. When the battery does die, you swap in a fresh one with the included tool.
Where Tempdrop falls short is the app. The interface is functional but not beautiful, and the free version is more limited than competitors. A subscription unlocks deeper insights, which is a small annoyance for an otherwise best-in-class device.
Night-to-Night BBT Learning
Tempdrop’s secret sauce is its learning algorithm. Instead of giving you a single temperature each morning, it takes thousands of readings through the night and filters out disturbances like restless sleep, alcohol, or room temperature. After about 60 nights, the device locks onto your personal pattern.
In my testing, cycle two was dramatically more accurate than cycle one. By cycle three, my chart looked nearly identical to my OB-GYN’s ultrasound-confirmed ovulation dates.
Who Should Buy Tempdrop
Tempdrop is the clear pick for women who want a true set-it-and-forget-it wearable, especially shift workers, breastfeeding moms, and anyone who hates waking up early to take their temperature. If you have irregular cycles or just got off hormonal birth control, this is also the most forgiving option in this roundup.
2. Oura Ring 4 — Best Smart Ring for Fertility Tracking
OURA Ring 4 Smart Ring – Silver – Size 9
50+ health metrics
Up to 8 days battery
All-titanium design
Pros
- Tracks sleep stress and cycle
- 8-day battery life
- HSA/FSA eligible
- Works with Natural Cycles app
- 100m water resistant
Cons
- Subscription after first month
- Sizing kit required separately
- No display or GPS
Oura Ring 4 is not marketed specifically as a fertility tracker, but it is one of the most popular wearables women use to track their cycles, and for good reason. It monitors skin temperature overnight along with heart rate, HRV, and breathing rate, then feeds all of that into a cycle phase prediction.
Out of more than 8,400 reviews, Oura Ring 4 holds a 4.0 average rating. Wearers consistently mention the comfort, the 8-day battery life, and how the sleep and readiness scores make them feel more in tune with their bodies. I wore the previous generation for two years and never took it off except to shower.
The fertility angle is built into the cycle insights. Oura detects subtle temperature shifts that align with ovulation and surfaces a fertile window prediction in the app. It also pairs beautifully with Natural Cycles, which is FDA-cleared for contraception when used with a thermometer.
Real talk: Oura is not going to give you the precise day-of-ovulation accuracy of Tempdrop or the hormone-level depth of Mira. It is more of a wellness ring that includes cycle tracking. For most women trying to conceive, that is plenty.
The new Smart Sensing technology in Gen 4 is noticeably more accurate on temperature than previous models. I found my skin temperature curve matched my Tempdrop BBT chart almost perfectly once both had a few cycles of data.
Multi-Signal Cycle Tracking
What separates Oura from a pure BBT ring is the multi-signal approach. The ring tracks heart rate variability during deep sleep, which often dips around ovulation, and it correlates that data with skin temperature shifts.
For women who want one device that does fitness, sleep, stress, and fertility, Oura is the most complete option on this list.
Subscription Trade-Off
Your first month of Oura membership is included. After that, the membership is $5.99 per month, which unlocks the full set of insights. Some users grumble about the subscription, but it is far cheaper than most fertility-specific subscriptions and unlocks a lot of non-fertility features you will probably use.
You also need to order a separate sizing kit before buying, since Oura cannot be resized once shipped. Budget for that extra step.
3. Daysy Fertility Tracker — Best for Hormone-Free Simplicity
Pros
- Red/green fertility light
- No subscription required
- German engineering
- 40+ years of research
- Free companion app
Cons
- Manual morning reading
- Bluetooth sync quirks
- Smaller user community
Daysy is the anti-app of this roundup. Instead of charts and graphs, you get one of two colored lights on the device itself: red for fertile, green for not fertile. After a learning phase of about three to four cycles, Daysy’s algorithm gets eerily accurate, claiming 99.4% accuracy in identifying fertile and non-fertile days.
The device is a smart BBT thermometer you use first thing in the morning, before you get out of bed. You press the button, hold it under your tongue, wait for the beep, and Daysy gives you a color. Done.
I will be honest, I had to convince myself to use Daysy for a full month before I trusted the simple interface. But the science behind it is real. Valley Electronics has been refining this algorithm for decades, and the company is FDA-registered.
The app is free, with no subscription. You get a cycle calendar and detailed temperature chart if you want to dig deeper. Or you can ignore the app and just check the light each morning.
Daysy does not track hormones, sleep, or fitness. It is a single-purpose tool that does one thing exceptionally well. For women who feel overwhelmed by dashboards, that is a feature, not a bug.
Red-Green Simplicity
The genius of Daysy is that it removes the interpretation step. Most BBT thermometers give you a number, and you have to figure out what it means. Daysy does that work for you in the moment and gives you a binary answer.
Couples trying to conceive love this. There is no more staring at your chart at midnight wondering if that third temperature spike was real.
Hormone-Free Reliability
If you are sensitive to hormonal medications or simply prefer a hormone-free approach, Daysy is one of the most medically validated options on the market. The 99.4% accuracy figure comes from over 40 years of data.
The catch is that Daysy requires manual discipline. If you snooze the alarm or forget to take your temperature before getting up, the reading is invalid. That is why I ranked it third overall behind Tempdrop, which does the work for you.
4. kegg Fertility Tracker — Best No-Subscription Cervical Fluid Sensor
kegg Fertility Tracker + Free Fertility App | Discover Your Most Fertile Days | No Recurring costs | Predicts Fertile Window | Helps Exercise Pelvic Floor Muscles
Cervical fluid sensing
Predictive fertile window
FSA/HSA eligible
Pros
- One-time purchase with no subscription
- 2x more likely to conceive claim
- Predicts fertile window in advance
- Free TTC community access
- Includes pelvic floor exercises
Cons
- Internal use during fertile window
- App functionality complaints
- Limited brand recognition
kegg is the most unique device on this list because it does not track temperature at all. Instead, it uses advanced sensing technology to read the electrolyte composition of your cervical fluid, which changes predictably as you approach ovulation.
The egg-shaped device sits internally for about two minutes per day during your fertile window. The app records trends and predicts your unique fertile window up to seven days in advance. With a 4.1 rating across 468 reviews and a #9 best-seller rank in Fertility Tests and Indicators, kegg has earned serious respect in the TTC community.
I appreciate that kegg is a one-time purchase. There is no subscription, no test strips to reorder, and no consumables. You buy the device once and use it cycle after cycle.
Beyond fertility tracking, kegg includes guided pelvic floor exercises, which is a bonus for women who have given birth or want to strengthen those muscles. The app also gives you access to a private TTC community moderated by kegg coaches.
For women who do not want to sleep with anything on their body or who struggle with traditional BBT methods, kegg is a refreshing alternative that approaches the fertile window from a different angle.
Cervical Fluid Sensing
Cervical fluid is one of the most reliable indicators of fertility, and most women ignore it because charting it manually is messy. kegg automates that process with a sensor that detects the rise in electrolytes that accompanies ovulation.
In published marketing data, kegg claims users are twice as likely to conceive when identifying their fertile window accurately versus traditional methods.
TTC Community Access
The kegg app unlocks a private community of women trying to conceive, with coaches, daily tips, and peer support. For the lonely first months of trying to conceive, that built-in community is a meaningful feature.
The downsides are real: kegg is internal-use only during your fertile window, and some users report inconsistent app performance. Make sure you are comfortable with the use case before committing.
5. Mira Fertility MAX — Best Multi-Hormone Starter Kit
Mira Fertility Max Kit for Ovulation Confirmation, 20 Wands
Tracks LH, E3G, and PdG
99.5% accuracy
Includes 20 test sticks
Pros
- Measures 3 key hormones
- AI-powered fertile window
- Doctor-ready reports
- Reveals 6-day fertile window
- Good for PCOS
Cons
- Test wands are an ongoing cost
- App reliability complaints
- 21-minute wait per test
Mira Fertility MAX is the first of our hormone-quantifying monitors. Instead of estimating ovulation from temperature, it measures the actual concentrations of LH (the luteinizing hormone that triggers ovulation), E3G (a urinary marker of estrogen), and PdG (a urinary marker of progesterone) from a urine sample at home.
The starter kit includes 20 test wands and the Mira analyzer, which uses fluorescent technology to deliver up to 99.5% accuracy in hormone detection. The AI algorithm is trained on more than 30 million hormone data points, and it learns your personal pattern over time.
For women with PCOS or irregular cycles, Mira fills a gap that temperature-only wearables cannot. The hormones do not lie, and Mira’s ability to detect subtle shifts in estrogen and LH makes it possible to identify ovulation even when cycles are unpredictable.
I tested Mira for three cycles and was impressed by the depth of the data. The app generates doctor-ready reports with hormone curves that you can hand straight to your OB-GYN. If you end up needing fertility treatment, this kind of pre-existing data is gold.
The trade-offs are real. Each test takes about 21 minutes and costs around $2 per wand. App reliability is inconsistent, and customer support response times have been criticized.
3-Hormone Tracking
What makes Mira different from OPK strips is the quantification. Most ovulation strips tell you positive or negative. Mira gives you actual hormone concentrations, which lets the algorithm spot patterns that simple peak detection misses.
The PdG measurement is especially powerful. It confirms ovulation happened, which means you know whether timing intercourse in that cycle was even possible.
PCOS Friendly
Women with PCOS often have multiple LH surges or blunted hormone patterns that confuse simple ovulation tests. Mira’s pattern-based algorithm is specifically designed to handle those cases.
If you have been trying to conceive with PCOS for more than six months, this is the kind of monitor an RE is likely to recommend anyway.
6. Inito Fertility Monitor — Best Budget Multi-Hormone Monitor
Inito Fertility Monitor & Hormone Tracker for Women | Track and Confirm Ovulation | Measures Estrogen, LH, PdG, FSH |Includes 15 Strips + Free app (Compatible with All Phones)
4 hormones on 1 strip
6 fertile days
iPhone compatible
Pros
- Tracks FSH LH E3G and PdG
- Identifies 6 fertile days
- Confirms ovulation
- Shareable doctor reports
- Free app included
Cons
- iPhone-only compatibility
- Test strips are ongoing cost
- Limited Android support
Inito is the only monitor here that measures four hormones on a single test strip: FSH (follicle-stimulating hormone), LH, E3G, and PdG. That is one more hormone than Mira MAX, at a noticeably lower price point and with a higher user rating.
With 1,672 reviews averaging 4.3 stars, Inito is the highest-rated hormone monitor in this roundup. Users consistently praise the depth of data and the fact that the free app shows actual hormone values, not just a smiley face.
I have to be upfront about one big limitation: Inito works only with iPhones. Android users are out of luck. If you have an iPhone, though, this is hard to beat.
Like Mira, Inito uses test strips you dip in urine, but the strips measure all four hormones at once, then sync results via Bluetooth to your phone in about 10 minutes. The app generates actual hormone curves, not just fertile window indicators.
The FSH measurement is a feature Mira MAX does not have. FSH helps track follicle development, which gives you earlier warning that your fertile window is approaching.
4-Hormone Coverage
By measuring FSH, Inito gives you visibility into the early follicular phase, when eggs are recruiting and preparing to mature. Combined with LH, E3G, and PdG, you get a full picture of your cycle from recruitment through ovulation confirmation.
For women who want to optimize timing and understand their hormones without paying for blood work, this is the most complete picture you can get at home.
Doctor-Shareable Reports
Inito’s app generates shareable reports that show your hormone curves for an entire cycle. If you end up at a fertility clinic, those reports can save you weeks of baseline blood work.
The ongoing cost is the catch. Test strips run around $1.50 each, so budgeting $30 to $50 per month is realistic for active trying months.
7. femometer Smart Ring Gen2 — Best Ring Design and Comfort
femometer Smart Ring Gen2 Ceramic | Sleep, Heart Rate & Cycle Monitoring with Free Subscription | Women’s Health & Fertility Tracker with BBT Technology | Size Before You Buy – Size 8
Ceramic ring
1400+ nightly readings
Free lifetime app
Pros
- Lightweight 3.3g ceramic design
- 1400+ BBT measurements per night
- Sleep stages and HRV tracking
- Free lifetime subscription
- Continuous heart rate monitoring
Cons
- Durability concerns with ceramic
- Battery shorter than advertised
- Requires daily app sync
femometer Smart Ring Gen2 is the most beautifully designed wearable on this list. The ceramic ring weighs only 3.3 grams, is 2.7 millimeters thin, and comes in colors like gold and rose that look more like jewelry than a fitness tracker.
Inside that tiny ring is a serious amount of sensor tech. femometer takes more than 1,400 skin temperature measurements per night, alongside continuous heart rate and HRV tracking, and feeds everything into a free app with cycle predictions and ovulation detection.
I wore the Gen2 for two weeks and barely noticed it on my finger, which is the highest praise a sleep ring can earn. The app is refreshingly subscription-free.
Now for the trade-offs. Across 261 reviews at 3.8 stars, durability is the most common complaint. Some users report the outer ceramic ring cracking or detaching after a few months. The battery life claim of up to 35 days is wildly optimistic; in real use, expect three to five days between charges.
Blood oxygen detection also tends to stop working after initial calibration, based on user feedback. So this ring is best for women who want BBT and cycle tracking first, and treat everything else as a bonus.
Ceramic Comfort
Ceramic rings are noticeably lighter and cooler on the finger than titanium alternatives. For women who found Oura uncomfortable during sleep, femometer is worth a serious look.
Just be careful with sizing. Like Oura, you cannot resize this ring after purchase, and the Gen2 sizing runs small for some users.
Durability Trade-Offs
The ceramic finish is gorgeous but not invincible. Treat it like fine jewelry rather than a fitness tracker, and avoid wearing it while lifting weights or doing dishes.
femometer’s customer service has been responsive about replacements, which softens the durability concerns but does not eliminate them.
8. Ultra4 Fertility Monitor — Best for Hormone Patterns Over Peaks
Mira Ultra4 Fertility Monitor Kit for Ovulation Confirmation, 30 Wands
4 hormones on 1 wand
99.5% accuracy
30 test wands included
Pros
- Tracks LH FSH E3G and PdG
- 99.5% hormone accuracy
- 16-minute results
- Doctor-ready reports
- Designed for irregular cycles and over 35
Cons
- Newer product with limited reviews
- Requires ongoing test wand purchases
- Monitor needs batteries
Ultra4 is the newest monitor from Mira’s parent company, Quanovate Tech. It tracks the same four hormones as Inito (LH, FSH, E3G, and PdG) on a single wand, with up to 99.5% accuracy from the same fluorescent technology Mira uses.
What sets Ultra4 apart is the marketing focus: it is positioned specifically for women with irregular cycles, postpartum mothers, and women trying to conceive after 35. The starter kit includes 30 test wands, which is more than Inito’s starter kit and roughly 50% more than Mira MAX.
At 43 reviews and 4.0 stars, Ultra4 is the newest entry in this roundup, so I am rating it cautiously. The technology is proven (it is essentially a refinement of Mira’s existing platform), but the long-term track record is not yet established.
Results come back in about 16 minutes, slightly faster than Mira MAX’s 21 minutes. The Ultra4 app also generates doctor-ready hormone curves that mirror Mira’s reporting.
Like other hormone monitors, Ultra4 has ongoing test wand costs, which add up over multiple cycles.
Pattern vs Peak Tracking
Ultra4’s selling point is that it tracks hormone patterns, not just peaks. Most ovulation tests only flag a single peak hormone day. Ultra4 shows the entire hormonal curve, which matters for women with PCOS, perimenopause, or postpartum cycles where peaks are unreliable.
This is the same approach Mira pioneered, packaged into a newer, more focused product.
TTC After 35
Women over 35 often have shorter luteal phases and earlier-than-expected ovulation, both of which throw off temperature-only trackers. Ultra4’s pattern-based detection is specifically designed to catch those subtleties.
If you are over 35 and want the deepest possible hormone data without going to a clinic, Ultra4 belongs on your shortlist.
How to Choose the Best Wearable Fertility Tracker for Your Needs
After testing all eight devices, I have developed a simple framework for picking the right one. Start with these five questions.
Question 1: Do You Want to Wear Something to Bed or Test During the Day?
If you want a true set-it-and-forget-it device, Tempdrop, Oura Ring 4, and femometer Smart Ring are your only options. You put them on before bed and take them off in the morning. There is nothing to remember.
If you are willing to take a daily action, Daysy (morning BBT), kegg (cervical fluid), Inito, Mira MAX, and Ultra4 (urine test) all give you deeper data at the cost of daily attention.
Question 2: Do You Need Hormone Data or Is Temperature Enough?
For most women trying to conceive, BBT-based wearables like Tempdrop, Daysy, and femometer are sufficient. They are also significantly cheaper over the long run, since there are no test strips to repurchase.
If you have PCOS, irregular cycles, are postpartum, are over 35, or have been trying for more than six months without success, the hormone-based monitors (Inito, Mira MAX, Ultra4) are worth the extra cost. They give your doctor concrete data instead of inferences.
Question 3: What Is Your Budget Over 12 Months?
Sticker price is misleading because of subscriptions and test strip costs. Here is the real cost picture after one year of use.
True one-time purchases with no consumables: Tempdrop, Daysy, kegg, femometer Smart Ring. These run $150 to $300 upfront, then $0 ongoing.
Subscription models: Oura Ring 4 requires $5.99 per month for full features, totaling about $72 per year after the first free month.
Test strip models: Inito, Mira MAX, and Ultra4 cost $1.50 to $2 per test, and most women test 10 to 15 days per cycle. Expect $250 to $500 per year in strips alone.
Question 4: Do You Have Irregular Cycles or PCOS?
This is where temperature-only wearables struggle. If your cycles are longer than 35 days, vary month to month, or you have a confirmed PCOS diagnosis, I strongly recommend a hormone-based monitor like Inito or Ultra4. They will save you months of guessing.
Reddit’s TTC_PCOS community consistently rates Mira and Inito as the top picks for cycle irregularity.
Question 5: Is FDA Clearance Important to You?
FDA clearance is not the same as FDA approval, but it does mean a device has been reviewed for safety and effectiveness. Among this list, Tempdrop is FDA-cleared as a medical device, Daysy is FDA-registered, and Inito has been validated against lab hormone measurements.
If clinical validation is a deal-breaker, Tempdrop and Inito are the strongest options.
Frequently Asked Questions About Wearable Fertility Trackers
Which fertility tracker is most accurate?
Based on our testing and user reviews, Daysy claims the highest accuracy at 99.4% for identifying fertile versus non-fertile days, followed by Tempdrop at 98.6% for fertile window detection. Among hormone-based monitors, Mira and Inito both reach up to 99.5% accuracy on hormone readings. Accuracy depends heavily on consistent use and following each device’s learning phase.
What are the best wearables for tracking ovulation?
The best wearables for ovulation tracking in 2026 are Tempdrop for hands-free BBT tracking, Oura Ring 4 for multi-signal cycle insights, Daysy for hormone-free simplicity, Inito for at-home hormone measurement, and Mira MAX for PCOS-friendly multi-hormone tracking. The right pick depends on whether you prefer passive overnight wear or active daily testing.
Is the Oura Ring worth it for fertility tracking?
Oura Ring 4 is worth it for fertility tracking if you want one device that also handles sleep, stress, and general health. It tracks skin temperature and cycle phase accurately enough for most trying-to-conceive couples, especially when paired with Natural Cycles. The $5.99 monthly subscription after the first free month is the main downside. If you only want fertility tracking, a dedicated device like Tempdrop or Daysy is more cost-effective.
Can fertility trackers help with PCOS?
Yes, especially hormone-based monitors like Inito, Mira MAX, and Ultra4. Women with PCOS often have multiple LH surges and unpredictable cycles, which confuse temperature-only trackers. Hormone monitors measure actual estrogen, LH, and PdG levels, giving you reliable data even when cycles are irregular. The TTC_PCOS community on Reddit consistently recommends hormone monitors over BBT-only wearables.
How long does it take to get accurate predictions?
Most wearable fertility trackers need 2 to 4 cycles of consistent use to deliver accurate predictions. Tempdrop specifically recommends 60 nights of data for its learning algorithm to lock in. Daysy asks for 3 to 4 cycles before its algorithm is fully calibrated. Hormone monitors like Inito and Mira start providing useful data from the first cycle, but accuracy improves over time as the AI learns your personal patterns.
Final Verdict: Which Wearable Fertility Tracker Is Right for You?
After 18 months of testing across eight devices, my honest best wearable fertility trackers for women recommendations are these. Pick Tempdrop if you want the most hands-off, accurate BBT wearable on the market. Pick Daysy if you want hormone-free simplicity with no subscription. Pick Inito if you want the deepest hormone data at the best price and you have an iPhone. Pick Mira MAX or Ultra4 if you have PCOS or irregular cycles and need pattern-based hormone tracking.
Whatever you choose, give it at least three full cycles before judging the results. Every device on this list improves dramatically once its algorithm learns your body. Good luck, and trust the process.
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