Best Fertility Tracking Apps 2026
The best apps to track your cycle, log ovulation data, and time conception perfectly.
Our Top Picks
- Best for BBT Charting: Fertility Friend — Gold standard for detailed tracking
- Best for OPK Tracking: Premom — Photographs and analyzes your test strips
- Best User Interface: Clue — Clean, science-based, beautiful design
- Best All-Around: Flo — User-friendly with great predictions
- Best for FAM: Read Your Body — Privacy-focused, FAM-friendly
Quick Comparison Chart
| App | Best For | BBT | OPK | Price |
|---|---|---|---|---|
| Fertility Friend | BBT charting, detailed data | ⭐⭐⭐ | ⭐⭐ | Free / $9.99/mo VIP |
| Premom | OPK photography | ⭐⭐ | ⭐⭐⭐ | Free / $14.99/mo |
| Clue | Clean UI, science-based | ⭐⭐ | ⭐ | Free / $9.99/mo |
| Flo | Ease of use, predictions | ⭐ | ⭐ | Free / $9.99/mo |
| Glow | Community, partner mode | ⭐⭐ | ⭐⭐ | Free / $14.99/mo |
| Read Your Body | FAM, data ownership | ⭐⭐⭐ | ⭐⭐ | Free / $4.99/mo |
| Natural Cycles | FDA-cleared contraception | ⭐⭐⭐ | ⭐ | $8.99/mo or $99/yr |
Our Top Picks: Detailed Reviews
Fertility Friend
✓ Pros
- Gold standard for detailed BBT charting
- Sophisticated ovulation detection algorithm
- Extensive data tracking (80+ data points)
- Robust free version
- Syncs with Tempdrop, Ava, and many devices
- Excellent educational content
- Active community forums
✗ Cons
- Outdated interface design
- Steep learning curve
- Can feel overwhelming for beginners
Fertility Friend has been the go-to app for serious TTC tracking since 2004. What it lacks in modern design, it makes up for in functionality. The BBT charting is unmatched—the algorithm analyzes your temps and identifies ovulation with impressive accuracy.
You can track everything: cervical mucus, OPKs, cervical position, symptoms, intercourse, supplements, and more. The chart analysis provides detailed insights, and the app's "Course" feature teaches you how to interpret your data.
FF syncs with Tempdrop, Ava, Oura Ring, and many smart thermometers. The free version is genuinely useful; VIP ($9.99/month or $54.99/year) adds advanced features like early pregnancy indicators and chart comparisons.
Best for: Anyone serious about BBT charting, data nerds, experienced TTC'ers.
Premom
✓ Pros
- Photograph and analyze OPK strips
- Automatic test/control line ratio
- Syncs with Easy@Home thermometers
- Visual timeline of your tests
- Helpful for catching LH surge
- Free core features
✗ Cons
- Photo reading isn't always accurate
- Push to buy Easy@Home products
- Premium required for some features
Premom's killer feature is OPK photo analysis. Snap a picture of your test strip, and the app reads the test/control line ratio and tells you if it's low, high, or peak. You get a visual timeline of your tests over time, making it easy to spot your surge pattern.
The app is made by Easy@Home, so it integrates seamlessly with their OPK strips and BBT thermometer. Even if you use other brands, the photo reading works, though accuracy varies.
Basic features are free. Premium ($14.99/month) adds advanced charts, cycle analysis, and ad-free experience.
Best for: OPK users who want digital line analysis, Easy@Home product users.
Clue Period & Cycle Tracker
✓ Pros
- Beautiful, intuitive design
- Science-based algorithms
- No pink/feminine stereotypes
- Excellent for cycle awareness
- Research partnerships with universities
- LGBTQ+ friendly
✗ Cons
- Less detailed fertility tracking than FF
- OPK/BBT features are basic
- Some TTC features behind paywall
Clue stands out for its clean, science-based design. It avoids the pink flowers and butterflies of other period apps, offering a gender-neutral interface that's a breath of fresh air.
The predictions are based on actual research (Clue partners with Columbia and Stanford). While the BBT and OPK tracking isn't as sophisticated as Fertility Friend, it's sufficient for many users, and the experience is far more pleasant.
Clue Plus ($9.99/month) unlocks personalized insights, cycle comparisons, and additional tracking categories.
Best for: Design-conscious users, anyone who wants a modern app experience, LGBTQ+ users.
Flo Period & Ovulation Tracker
✓ Pros
- Very user-friendly interface
- Good predictions based on cycle history
- Helpful content and articles
- Secret chats for TTC community
- Pregnancy mode after BFP
✗ Cons
- Predictions not as accurate for irregular cycles
- Limited BBT charting
- Aggressive premium upsells
- Past privacy concerns (addressed in 2021)
Flo is one of the most popular period tracking apps globally, and for good reason—it's incredibly easy to use. The interface is welcoming, predictions are reasonably accurate for regular cycles, and there's lots of educational content.
For TTC, Flo shows your fertile window and lets you log basic fertility signs. It's not as detailed as Fertility Friend, but for users who want simplicity over data depth, it works well.
Note: Flo had privacy issues in the past but has since improved. Premium is $9.99/month.
Best for: Beginners, users who want ease over depth, regular cycles.
Glow Fertility & Ovulation
Glow offers comprehensive tracking with a strong community aspect. The Partner Mode lets your partner track your cycle and receive reminders—great for involving them in the TTC process. Community forums are active and supportive.
Glow Premium ($14.99/month) unlocks detailed insights and removes ads.
Best for: Couples who want to track together, community-oriented users.
Read Your Body
Read Your Body is built by and for the Fertility Awareness Method (FAM) community. It's designed around the principle that you interpret your data—the app doesn't make predictions for you. This gives you full control and understanding of your cycle.
Privacy-first: Your data is stored locally and can be exported. No cloud sync by default, no selling data. This matters post-Roe for users concerned about data privacy.
It syncs with Tempdrop and other devices. Premium is very affordable at $4.99/month.
Best for: FAM practitioners, privacy-conscious users, those who want data ownership.
Natural Cycles
Natural Cycles is unique as the only FDA-cleared app for contraception. It uses your BBT data to determine fertile vs. non-fertile days with high accuracy. It has a "Plan Pregnancy" mode that flips the algorithm to identify your best conception days.
It's subscription-only ($8.99/month or $99/year), which includes a thermometer. The algorithm is effective but requires consistent BBT data.
Best for: Users who want an FDA-cleared algorithm, those transitioning from contraception to TTC.
Key Features to Look For
For TTC, prioritize:
BBT Charting: The ability to log daily temperatures with 0.01° precision and visualize your thermal shift. Fertility Friend excels here.
OPK Logging: Track positive and negative OPKs. Premom's photo analysis is unique and helpful.
Cervical Mucus Tracking: Log mucus quality (dry, sticky, creamy, egg white) to identify fertility patterns.
Intercourse Logging: Track when you had sex to correlate with your fertile window.
Algorithm Accuracy: Predictions based on your data, not just calendar math. Apps like FF analyze multiple data points.
Device Integration: Sync with smart thermometers, wearables, and OPK readers for automatic logging.
Free vs. Paid: Is Premium Worth It?
Most apps offer genuinely useful free versions. Here's what premium typically adds:
| App | Free Features | Premium Adds |
|---|---|---|
| Fertility Friend | Full charting, predictions, analysis | Early pregnancy signs, chart overlays, no ads |
| Premom | OPK photos, basic charting | Advanced analysis, cycle comparison, no ads |
| Clue | Period tracking, basic predictions | Detailed insights, cycle history analysis |
| Flo | Period tracking, fertile window | Personalized insights, health reports |
Our take: Fertility Friend's free version is robust enough for most users. Premom premium is worthwhile if you rely heavily on OPK tracking. For Clue and Flo, free versions are often sufficient unless you want detailed insights.
Frequently Asked Questions
Can I use multiple apps?
Absolutely! Many TTC'ers use Premom for OPK tracking and Fertility Friend for BBT charting. The data doesn't need to be in one place—use whatever works best for each function.
Are fertility app predictions accurate?
Apps that rely solely on calendar math (average cycle length) are less accurate. Apps that incorporate your actual data—BBT, OPKs, cervical mucus—are much more reliable. That's why Fertility Friend's algorithm is trusted: it uses your real data, not assumptions.
What about data privacy?
This is a legitimate concern, especially post-Roe. Read Your Body is the most privacy-focused option (local storage, no cloud). Fertility Friend and Clue have decent privacy policies. Flo had past issues but has improved. If privacy is a priority, research each app's data handling.
Which app works with Tempdrop?
Tempdrop syncs with Fertility Friend, Read Your Body, and exports to other apps. It's most commonly paired with Fertility Friend for comprehensive charting.
I have irregular cycles—which app is best?
Fertility Friend handles irregular cycles well because it looks at your actual data rather than relying on calendar predictions. Read Your Body is also good because it doesn't make predictions—it just shows your data. Avoid apps that heavily rely on "average" cycle math.
The Bottom Line
For serious TTC tracking with BBT, Fertility Friend remains the gold standard despite its dated interface. For OPK tracking, Premom's photo analysis is genuinely helpful. If you want a beautiful, modern experience, try Clue. For simplicity, Flo works well.
Many users find the best approach is combining apps: Premom for OPKs, Fertility Friend for BBT. Use what works for you—the best app is the one you'll actually use consistently.
Happy tracking! 💚