How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- Flo and Clue lead on polish and scale: Flo for guided health content and predictions, Clue for science-first tracking under strict EU privacy law.
- Natural Cycles is the only app in this list cleared by the FDA as a contraceptive method, which makes it a different category from the rest.
- Fertility Friend and Kindara serve people who want detailed basal body temperature charting rather than simple calendar predictions.
- Glow and Stardust add community and lifestyle layers around tracking, while Period Tracker by GP Apps and WomanLog stay simple and free.
- Privacy policies vary widely, so read how each app handles health data before you log a single cycle.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Flo | guided cycle tracking with health education | See website | Yes |
 Clue | science-based tracking with EU-grade privacy | See website | Yes |
 Natural Cycles | hormone-free contraception backed by a medical device clearance | See website | No |
 Glow | fertility tracking with community support | See website | Yes |
 Ovia Fertility | trying to conceive with structured guidance | See website | Yes |
 Fertility Friend | data-heavy basal body temperature charting | See website | Yes |
 Kindara | fertility awareness method practitioners | See website | Yes |
 Period Tracker by GP Apps | simple, free period logging without fuss | See website | Yes |
 Stardust | cycle tracking with a wellness and astrology twist | See website | Yes |
 WomanLog | customizable calendar tracking with strong privacy controls | See website | Yes |
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10 ovulation and period tracker apps worth downloading
Starting priceSee website
Free planYes
Flo is the biggest name in cycle tracking, with tens of millions of monthly users, and it shows in the polish. Log symptoms for a few cycles and the predictions sharpen; the app then layers on daily health insights, a pregnancy mode with week-by-week guidance, and even a partner-sharing feature. For someone who wants one app from first period through pregnancy, Flo covers the whole arc.
The tradeoff is the freemium model. Core tracking is free, but personalized insights and much of the content require Premium. Flo has also faced scrutiny over data practices in the past, so take a minute to review what you share and the available privacy controls before diving in.
What we like- Polished predictions for periods, ovulation and pregnancy
- Large library of expert-reviewed health content
- Modes for cycle, conception, pregnancy and perimenopause
Watch out for- The most useful insights sit behind the Premium subscription
- The app collects detailed health data, so review the privacy settings
Starting priceSee website
Free planYes
Clue takes a deliberately scientific tone: no fertility euphemisms, no pink overload, just cycle data presented clearly. It tracks symptoms, moods and pain alongside bleeding, and its analyses have been used in published research with institutions like Oxford. The free tier covers period and symptom tracking well.
Privacy is Clue's clearest edge. As a German company it applies GDPR protections globally and states plainly that it has never sold health data. If data handling is your deciding factor, Clue deserves the top spot on your shortlist.
What we like- Clean, non-pink, gender-neutral design
- Predictions improve as you log
- Berlin-based with strict GDPR protection and a public no-data-sale stance
Watch out for- Ovulation predictions for conception require the paid Conceive mode
- The interface is deliberately spare, which some users find less engaging
Starting priceSee website
Free planNo
Natural Cycles is not really a period tracker with a fertility feature; it is a regulated medical device that happens to live on your phone. You log basal body temperature (or sync a wearable), and the algorithm assigns each day a fertility status for either preventing or planning pregnancy. That FDA clearance sets it apart from every other app here.
The commitment is real: daily temperature readings, a paid subscription, and an 18+ age requirement. For people seeking hormone-free contraception with clinical validation, that tradeoff is the point. For casual period logging, it is more than you need.
What we like- The first and only app FDA-cleared as birth control
- Temperature-based algorithm personalizes to your cycle
- Integrates with Apple Watch, Oura and Garmin
Watch out for- Requires a paid subscription with no free tier
- Demands consistent daily temperature data to work as intended
Starting priceSee website
Free planYes
Glow has been in the fertility space since 2013 and built one of the largest user communities around trying to conceive. The core tracker handles periods, ovulation symptoms and fertility forecasts competently, and the forums connect you with people at the same stage, which many users value as much as the predictions.
The free experience includes promotions for Glow's broader product family, and premium features add deeper insights. As with any health community, the forums are support, not medical advice. Used alongside your own tracking data, Glow is a solid mainstream choice.
What we like- Long-running app with refined ovulation predictions
- Active community forums for TTC and pregnancy
- Companion apps for pregnancy and baby tracking
Watch out for- The interface carries ads and upsells in the free tier
- Community content is user-generated, so treat medical claims there skeptically
Starting priceSee website
Free planYes
Ovia Fertility approaches trying to conceive like a guided program. Each day brings a fertility score, personalized tips and health content reviewed by clinicians, and the app folds in sleep, activity and nutrition data for a fuller picture. It is free for individual users, with Ovia's business built on employer and health-plan partnerships.
That employer angle is worth knowing: Ovia's data practices have drawn press attention, so read the privacy policy. For pure cycle logging without the conception focus, Ovia's sibling apps or a simpler tracker may fit better.
What we like- Detailed fertility score and daily TTC tips
- Backed by a clinical team at Ovia Health (a Labcorp company)
- Syncs with Apple Health and fitness trackers
Watch out for- Geared toward the US employer-benefit market, so some features assume that context
- The focus on conception means less for pure period tracking
Starting priceSee website
Free planYes
Fertility Friend is the veteran: online since 1998, it predates the smartphone era and it shows in the best way for serious charters. Its ovulation detection from basal body temperature data is widely respected in TTC communities, and features like chart overlays let you compare your patterns against thousands of others.
Newcomers may bounce off the dense interface. But if you are charting BBT, cervical fluid and ovulation tests to conceive, no app interprets that data with more experience. The free tier is genuinely useful, with VIP membership adding advanced analysis.
What we like- The deepest charting tools in the category, with BBT interpretation honed since 1998
- Chart overlays and community chart galleries
- No ads or third-party trackers per its privacy stance
Watch out for- The interface looks dated next to Flo and Clue
- The learning curve is steeper for beginners
Starting priceSee website
Free planYes
Kindara serves people practicing fertility awareness methods, whether to conceive or avoid pregnancy. Rather than handing you a black-box prediction, it teaches charting of basal body temperature, cervical fluid and other signs, with the app as your digital chart. That educational stance builds real body literacy.
If you want the app to do all the thinking, Kindara will feel like homework. If you want to understand your cycle deeply and use a method backed by your own observations, it is one of the most trusted tools for the job.
What we like- Built specifically for fertility awareness-based methods
- Clean charting of temperature, cervical fluid and other biomarkers
- Supportive community
Watch out for- Smaller user base means fewer crowd-sourced insights
- Assumes you want to learn a method, not just get predictions
#8
Period Tracker by GP Apps
Best for: simple, free period logging without fuss
Visit gpapps.com
Starting priceSee website
Free planYes
Period Tracker by GP Apps is the no-nonsense option: open the app, tap when your period starts, get predictions for the next one. It covers symptoms, moods, temperature and notes, plus TTC and pregnancy modes for when your needs change. Millions of downloads attest to the formula.
Do not expect AI-driven insights or sleek data visualizations. This is a digital calendar that does its job quietly. For anyone who finds the big apps overwhelming or simply wants reliable period predictions, that simplicity is the appeal.
What we like- Straightforward one-tap period logging with predictions
- Symptom, mood and weight tracking included
- Lightweight and free
Watch out for- Basic ovulation estimates rather than advanced fertility analysis
- The design is functional rather than beautiful
#9
Stardust
Best for: cycle tracking with a wellness and astrology twist
Visit stardust.app
Starting priceSee website
Free planYes
Stardust stands out immediately: it maps your hormonal cycle against lunar phases and your birth chart, delivering daily insights with a cosmic flavor. Beneath the aesthetic is a competent tracker covering periods, ovulation, PMS and pregnancy, with the ability to sync cycles with friends or a partner.
The women-led team emphasizes privacy, stating it never sells personal health information. Take the astrology as entertainment layered over real tracking. For users who want their cycle app to feel personal and even playful, Stardust is unlike anything else here.
What we like- Distinctive design blending cycle science with lunar and astrological insights
- Cycle syncing with friends and partners
- Women-led team with a public privacy commitment
Watch out for- The astrology layer will not appeal to everyone
- The website root currently fails to load, though the apps remain actively updated
#10
WomanLog
Best for: customizable calendar tracking with strong privacy controls
Visit womanlog.com
Starting priceSee website
Free planYes
WomanLog is a workhorse: a calendar-first tracker with deep customization, from symptom lists to reminder types to multiple calendar support. It handles irregular cycles, offers pregnancy mode, and includes password protection plus local data export for the privacy-conscious.
It will not win design awards, and some features sit in the paid Pro version. But for users who want a dependable, private-feeling period calendar without social features or content feeds, WomanLog has quietly served that need for years.
What we like- Highly customizable with 100+ symptoms, password protection and data export
- Works well for irregular cycles
- Long track record as a reliable calendar app
Watch out for- The interface feels dated
- Advanced features like the Pro version cost extra
How we chose
We evaluated apps on prediction approach (calendar-based versus temperature-based versus FDA-cleared algorithms), the breadth of tracking (symptoms, BBT, cervical fluid, mood), privacy posture and jurisdiction, pricing transparency, and platform availability on iOS and Android. We read vendor homepages and privacy pages, app store listings, and public reviews on Reddit and health publications. We did not test the apps hands-on or verify medical claims; effectiveness statements reflect vendor-published information.
Picking a cycle tracker you can trust with your data
Cycle data is health data, and health data deserves scrutiny. Before committing to an app, read its privacy policy with three questions in mind: does it sell or share data with third parties, where is the company based (EU-based companies operate under GDPR), and can you delete your data permanently. Clue and Natural Cycles publish unusually clear stances; others require more digging.
Then match the app to your goal. Casual period predictions need only a simple logger. Trying to conceive benefits from BBT charting or a dedicated program like Ovia. Avoiding pregnancy without hormones is the one job where a cleared medical device like Natural Cycles is in a different league from calendar apps, and it is worth understanding that no prediction app doubles as contraception unless it is regulated as such.
What the science says about prediction accuracy
Calendar-based predictions work best for regular cycles and get less reliable as irregularity grows. Temperature-based methods add a physiological signal, which is why they underpin both fertility awareness practice and Natural Cycles' algorithm. Published validation exists for a few products, most notably Natural Cycles' clinical studies, while most consumer apps do not publish accuracy figures. Treat every app's fertile window as an estimate, log consistently for several cycles before trusting the output, and talk to a clinician about anything that affects medical decisions.
Frequently asked questions
Which period tracker app is the most accurate?
Accuracy depends on your cycle and your inputs. Temperature-based apps like Natural Cycles personalize predictions to your body rather than assuming a standard cycle, and dedicated BBT charting in Fertility Friend is well regarded. Calendar apps improve as you log more cycles but struggle with irregularity.
Are period tracker apps private and safe to use?
It varies. EU-based apps like Clue and Natural Cycles operate under GDPR and publish clear no-sale policies. US-based apps follow different rules, so read each privacy policy and check the app's data deletion options before entering sensitive information.
Can I use a period tracker app as birth control?
Only Natural Cycles in this list is cleared by the FDA as a contraceptive method. Standard period and ovulation trackers are not contraception and should not be relied on to prevent pregnancy.
Do I need to pay for a good cycle tracking app?
No. Clue, Flo, Glow, Fertility Friend, Kindara, Period Tracker, Stardust and WomanLog all offer useful free tiers. Paid subscriptions typically add advanced insights, predictions and content. Natural Cycles is the exception, requiring a paid subscription.
Which app is best for irregular periods?
Apps that learn from your actual data handle irregularity better than fixed-calendar math. Natural Cycles explicitly supports irregular cycles, and diligent BBT charting in Fertility Friend or Kindara gives you real signals regardless of cycle length. Give any app at least three cycles of consistent logging before judging it.
Sources we checked (10)
- https://flo.health
- https://helloclue.com/
- https://www.naturalcycles.com
- https://glowing.com
- https://www.oviahealth.com
- https://fertilityfriend.com/
- https://kindara.com/
- https://gpapps.com/
- https://stardust.app
- https://www.womanlog.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.