Best Fertility Apps Compared: Which Should You Use?
From data-obsessed charting to simple period tracking. We compare the top fertility apps so you can find your match.
Best for serious TTC tracking: Fertility Friend (detailed charts, algorithm-based predictions). Best for OPK tracking: Premom (scans test strips, great for beginners). Best design: Clue (clean, science-backed, gender-neutral). Best overall experience: Flo (beautiful UI, good predictions, comprehensive). Your choice depends on whether you want detailed data or simple predictions.
Our Top Picks
Quick Comparison
| Feature | Fertility Friend | Premom | Clue | Flo |
|---|---|---|---|---|
| BBT charting | ✓ Excellent | ✓ Good | ~ Basic | ~ Basic |
| OPK logging | ✓ Manual | ✓ Auto-scan | ✕ | ✓ Manual |
| Cervical mucus | ✓ Detailed | ✓ Basic | ✓ Good | ✓ Basic |
| Algorithm quality | ✓ Excellent | ~ Good | ✓ Good | ✓ Good |
| Modern design | ✕ Dated | ~ Okay | ✓ Excellent | ✓ Excellent |
| Community | ✓ Active | ~ Small | ✕ | ✓ Large |
| Free version | ✓ Very usable | ✓ Usable | ✓ Usable | ~ Limited |
Detailed Reviews
Fertility Friend is the gold standard for serious fertility tracking. Its algorithm is highly respected, and its charting features are unmatched. The tradeoff: it looks like it was designed in 2005 (because it was).
- Most accurate algorithm
- Incredibly detailed charting
- Excellent free version
- Huge knowledge base
- Active community
- Outdated interface
- Steep learning curve
- Can feel overwhelming
- Not intuitive for beginners
Premom's standout feature is OPK scanning: take a photo of your ovulation test strip and the app reads and logs the result automatically. Made by Easy@Home (the test strip company), it's designed specifically for TTC.
- Best OPK tracking feature
- Easy to use
- Syncs with devices
- Free version is solid
- Less sophisticated algorithm
- Privacy concerns (Chinese company)
- Some users report scan errors
- Premium has ads for products
Clue prioritizes scientific accuracy and inclusive, gender-neutral language. Its interface is clean and modern—a refreshing change from pink baby-themed apps. Great for general cycle tracking, though TTC-specific features are more limited.
- Beautiful, clean interface
- Science-backed content
- Gender-neutral language
- Strong privacy policy
- Limited TTC-specific features
- No OPK tracking
- Basic BBT (no charts)
- No community
Flo is the world's most downloaded period tracker, and it shows in the polish. Beautiful design, AI-powered predictions, and extensive health content. The TTC mode is good, though power users may find it less detailed than Fertility Friend.
- Gorgeous interface
- Good predictions
- Extensive content
- Pregnancy mode too
- Active community
- Premium is pricey
- Free version has limits
- Less detailed charting
- Past privacy issues (settled)
A Note on Privacy
Fertility data is sensitive. Before choosing an app, consider: Where is your data stored? Is it sold or shared? Can you delete it? After the Dobbs ruling, some users worry about fertility data being subpoenaed. Apps like Clue (EU-based) have stronger privacy protections. Read the privacy policy—or at minimum, check reviews discussing privacy practices.
Frequently Asked Questions
Apps that only use cycle length (like basic Flo or Clue) give estimates, not certainty—they assume you ovulate 14 days before your period, which isn't true for everyone. Apps that incorporate BBT and/or OPK data (like Fertility Friend) are more accurate because they use actual ovulation signals from your body.
For most apps, the free version is sufficient for basic tracking. Premium typically adds: more detailed analysis, educational content, additional tracking features, and ad removal. Fertility Friend's free version is remarkably complete. Flo's free version is more limited. Try free first; upgrade if you want more.
Yes, some people do. A common combo: Premom for OPK scanning + Fertility Friend for detailed BBT charting. The downside is double data entry. If you're going to use one app, Fertility Friend is the most comprehensive; if you want simplicity + OPKs, Premom works well alone.
Natural Cycles is FDA-cleared for contraception and TTC. It's subscription-based (~$100/year) and requires their thermometer. Good algorithm, but pricey. Ovia is free and comprehensive but has faced privacy criticism for sharing data with employers. Both are viable options with tradeoffs.
The Bottom Line
The best fertility app depends on how you want to track:
- For detailed BBT charting and comprehensive tracking: Fertility Friend
- For easy OPK tracking: Premom
- For clean design and privacy: Clue
- For a beautiful all-in-one experience: Flo
Try a couple and see what clicks. You can always switch—most apps let you export data. The best app is the one you'll actually use consistently.
Medical Disclaimer: Fertility apps provide estimates, not guarantees. They're tools to help you understand your cycle—not medical devices. If you have concerns about fertility, consult a healthcare provider.