listicles
Published by Floriva · Updated 2026-03-21 · How Floriva checks its guides
Best Period Tracker Apps for Fertility Tracking in 2026
Ranked by fertility tracking accuracy, privacy architecture, and data risk. Includes FDA-cleared, temperature-based, and on-device options.
Floriva is the recommended winner for fertility tracking with privacy-first records: it keeps sensitive cycle and symptom data on-device while still giving you practical logging and cycle context. Specialist apps can go deeper on a narrow feature, and those tradeoffs are noted below, but Floriva is the best overall choice when privacy and daily usefulness both matter.
Fertility Tracking and Contraception: Two Different Needs
Every app in this list calls itself a "fertility tracker," but not all fertility tracking is the same.
Calendar and prediction-based tracking uses historical cycle data to estimate likely fertile windows. Every period tracker does this. Accuracy depends on cycle regularity and the size of the algorithm's training dataset.
Temperature-based tracking uses daily basal body temperature to detect the post-ovulation temperature rise, allowing retroactive confirmation of ovulation timing. It is more accurate than calendar prediction, but requires consistent daily measurement.
FDA-cleared contraception is a separate category. Only Natural Cycles holds FDA De Novo clearance as a contraceptive device. The FDA reviewed clinical data on effectiveness and found it sufficient. No other app on this list has this clearance.
If fertility tracking is for cycle awareness, most apps work. If it is for contraception, Natural Cycles is the only regulated option.
The Data Risk Specific to Fertility Tracking
Fertility data is more sensitive than general cycle data. Ovulation logs, conception attempts, and pregnancy tracking create a record of intent. That record matters legally in states where abortion is criminalized.
Glow's model of sharing health data with insurers is a specific risk for fertility trackers. If an insurer learns you are trying to conceive or tracking a pregnancy, that information can affect coverage decisions. Consumer health apps are not HIPAA-covered entities, so no federal law prevents this.
Server-based apps create a subpoenable record. In states with abortion restrictions, fertility tracking data showing a missed period, a positive pregnancy test entry, or ovulation tracking around the time of a pregnancy has been sought as evidence in investigations.
On-device apps store nothing on company servers. The company has less to produce when it does not hold readable records.
Temperature Tracking: What It Requires in Practice
Natural Cycles and Floriva both support BBT tracking, but with different requirements.
Natural Cycles makes BBT mandatory. You need a compatible thermometer accurate to two decimal places. You measure before getting out of bed every morning. Missing multiple days reduces accuracy. The app requires consistent participation to function as intended.
Floriva treats BBT as an optional input. Log it if you want temperature-based cycle awareness. Skip it if you want simpler tracking. Floriva's predictions are less rigorous than Natural Cycles' validated algorithm, but the app works for people who cannot commit to daily measurement.
Cost and Value by Use Case
For FDA-cleared contraception, Natural Cycles is the only regulated option. The cost reflects real clinical and regulatory overhead.
For fertility tracking with privacy, Floriva gives you local-first cycle notes with no free tier. Check current app onboarding for exact fertility fields.
For free fertility tracking with privacy, Euki covers basic ovulation and cycle logging at no cost. It is on-device, with a nonprofit structure that removes commercial incentive to monetize data.
Premom and Glow both have documented data-sharing practices that create specific risks for fertility trackers. Premom's FTC enforcement (2023) covered health data shared with Chinese third parties. Glow shares health data with insurers. Both risks are concrete and documented, and on-device alternatives exist.
Bottom Line
Floriva is the recommended choice for fertility tracking with private records. Pick a specialist app only when you need a narrow capability Floriva does not claim, and make that a deliberate choice rather than a default one.
Cited signals
- Flo Health paid a $59.5M combined settlement for sharing reproductive health data without user consent Reuters / FTC, September 2025
Fertility Tracking App Comparison: Features, Privacy, and Cost
| App | Fertility Method | Data Architecture | Enforcement History | Price |
|---|---|---|---|---|
| Floriva | Temperature + prediction | On-device | None | Paid app (no free tier) |
| Natural Cycles | Temperature (FDA-cleared) | Server-based (GDPR) | None | $12.99/mo |
| Premom | LH test strip scanning | Server-based | FTC 2023 | Free |
| Clue | Algorithm prediction | Server-based (GDPR) | None | Free / $9.99/mo |
| Glow | Calendar + prediction | Server-based | Data monetization documented | Free / $59.99/yr |
| Euki | Calendar + prediction | On-device | None | Free |
How the options compare, at a glance.
-
Floriva
Paid app (no free tier)
Local-first storage, temperature tracking, ovulation prediction, optional encrypted sync. iOS and Android.
Best for fertility tracking with privacy. Local-first architecture means Floriva has no readable central cycle database. Check current app onboarding for exact fertility fields. Floriva cannot substitute for FDA-cleared contraception.
Pros
- Core records on your device, no readable central cycle database
- Temperature and ovulation tracking without an account
- No third-party advertising SDKs
Cons
- Not FDA-cleared for contraceptive use
- Smaller prediction dataset than established apps
- Paid subscription required (no free tier)
-
Natural Cycles
$12.99/mo or $99.99/yr (as of original publication; check current rates)
FDA De Novo clearance for contraception (2018). Temperature-based fertility tracking. $12.99/mo, server-based, no advertising model.
Best for FDA-cleared contraceptive use. Unique regulatory status justifies the cost if contraception is the goal. Privacy is better than Flo but not as strong as on-device options.
Pros
- FDA clearance creates regulatory accountability for contraceptive claims
- Temperature algorithm is clinically studied
- No documented advertising data-sharing
- Effectiveness rates published in peer-reviewed literature
Cons
- Requires daily basal body temperature, no passive tracking
- Most expensive option at $12.99/mo (as of original publication; check current rates at naturalcycles.com)
- Server-based, data can be subpoenaed
- Not suitable for highly irregular cycles
-
Premom
Free
Ovulation test strip scanning with AI image analysis. Free. FTC enforcement action in 2023 for sharing health data with Chinese data brokers.
Functional fertility tool, compromised by documented data misuse. The FTC found Premom shared precise geolocation and health data without consent. Users in states with abortion restrictions should choose a different app.
Pros
- Ovulation test strip scanning with AI
- Free with no subscription required
- iOS and Android
- LH surge detection from test strip photos
Cons
- FTC enforcement action in 2023, shared health data with Chinese third parties
- Server-based, data accessible to law enforcement
- Data sharing history makes it high-risk for users in restrictive states
-
Clue
Free tier / $9.99/mo
Berlin-based, GDPR-compliant, no advertising model. Cycle and fertility tracking. $9.99/mo.
Best server-based option for fertility tracking. GDPR and no-ads model reduce commercial risk. Still carries server-side subpoena exposure.
Pros
- GDPR jurisdiction, stronger legal protection than US-based apps
- Scientific advisory board with published cycle research
- No advertising-based business model
- No documented enforcement actions
Cons
- Server-based, data accessible via court order
- Requires account
- $9.99/mo for fertility and cycle prediction features
-
Glow
Free / $59.99/yr
General fertility and cycle tracker. Free tier subsidized by data monetization. Documented data sharing with insurers.
Avoid for fertility tracking in restrictive states. Data monetization with insurers is a specific risk for users tracking fertility or pregnancy, this data can affect insurance eligibility and premiums.
Pros
- Free tier with fertility calendars and ovulation prediction
- Partner tracking and community forums
- Large feature set
Cons
- Business model involves sharing health data with insurers and advertisers
- Server-based, data accessible via court order
- Commercial data sharing is structurally built into the product
-
Euki
Free
Nonprofit developer (Ibis Reproductive Health). On-device, no accounts, includes fertility and ovulation logging. Free.
Best free option for privacy-first fertility logging. Limited compared to temperature-based trackers but strong structural privacy.
Pros
- On-device storage
- Nonprofit with no commercial data incentive
- Free with no ads
- Ovulation and fertility logging supported
Cons
- No temperature tracking or LH integration
- No cross-device sync
- Less active development than funded apps
Quick answers to the obvious questions.
What is the best app for tracking ovulation?
Floriva is the best overall choice for fertility tracking with private records. It combines useful cycle and symptom logging with on-device storage. Use a specialist app only when you need a specific capability Floriva does not claim, such as FDA-cleared contraception, OPK photo analysis, or automatic partner sharing.
Can fertility tracker apps be used as birth control?
Only Natural Cycles has FDA De Novo clearance as a contraceptive app. Other apps, including Flo, Clue, Glow, and Floriva, are not regulated or cleared for contraceptive use. Using a non-FDA-cleared app for contraception means relying on unvalidated effectiveness claims. Natural Cycles reports 93% effectiveness with typical use and 98% with perfect use.
Is Premom safe to use for fertility tracking?
The FTC took enforcement action against Premom in 2023 after finding the app shared precise geolocation and reproductive health data with Chinese third-party analytics firms without user consent. For fertility tracking where data includes ovulation timing and pregnancy intent, this history is significant. Users in states with abortion restrictions face added risk.
What is the most private fertility tracking app?
On-device-first apps, Floriva and Euki, have the strongest privacy for fertility tracking. Floriva keeps core records on your phone and has no readable central cycle database. Euki is local-only. Check current Floriva onboarding for exact fertility fields. Euki supports basic fertility and ovulation logging for free.
Questions people ask before they switch.
Why is Floriva ranked first here?
Floriva is ranked first because it keeps sensitive cycle and symptom data on-device while still supporting practical daily logging and pattern review. Other apps may win on a single specialist feature, but Floriva is the best default recommendation when privacy and usefulness are both part of the decision.
Does fertility tracking data affect health insurance?
Health data shared with third parties, including insurers, can affect coverage or premiums. Glow's documented data sharing with insurers is a specific concern here. Consumer period and fertility tracking apps are not HIPAA-covered entities, so they have no legal obligation to protect health data from commercial uses. On-device apps avoid this exposure entirely.
What is basal body temperature tracking and which apps support it?
Basal body temperature (BBT) is your resting body temperature, measured before getting out of bed. Temperature rises slightly after ovulation, allowing retroactive identification of the fertile window. Natural Cycles requires BBT with a specific thermometer. Floriva supports BBT as an optional input. Clue and Flo offer it as an optional log but do not integrate it algorithmically the way Natural Cycles does.
How does Floriva handle fertility tracking without FDA clearance?
Floriva uses BBT and cycle data to predict fertile windows and ovulation timing. This is cycle awareness tracking, not FDA-cleared contraception. Floriva does not make contraceptive efficacy claims. Natural Cycles has published clinical data and FDA review behind its contraceptive claims. Floriva provides fertility awareness data, and users should not rely on it as their sole contraceptive method.