Clue vs Flo: Which Period Tracker Is Actually Better?

Clue suits people who want a science-led, focused cycle tracker from a Berlin-based company under GDPR. Flo suits people who want a large content library and community features. Veya is a third option if you also want mood, sleep, fitness, and nutrition logged next to your cycle.

By Veya Team • Published March 12, 2026 • Last reviewed October 24, 2026 • 8 min read • App Comparison

Full Transparency

This comparison is published by Holland Neurotech Inc., the company behind Veya. We've included Veya as a third option where relevant. We've done our best to compare each app fairly based on publicly available features, pricing, and user reviews. If Clue or Flo is the better fit for you, use it.

Quick Answer

Clue and Flo are built around different priorities. Here's how they line up by use case, with sources linked where we cite numbers (App Store details are as of October 2026):

If you're weighing a third option, see how switching to Veya works.

Clue and Flo are two of the best-known period trackers. If you're trying to pick one, you're not alone. The answer isn't as simple as "this one is better."

They're built for different priorities. Clue leans into science and privacy. Flo leans into community and content. Both have trade-offs. We'll walk through exactly what you get with each, what you don't, and introduce a third option you might not have considered.

The Short Version

If you're in a rush, here's the quick breakdown:

Clue Flo Veya
Best for Privacy and science Community and content All-in-one tracking
Platform iOS + Android iOS + Android iOS only (+ web app)
Free tier Basic, with upsell prompts Core tools free, Premium upsells Most features, no ads
Premium price $39.99/year $47.99–$59.99/year ~$49.99/year
Privacy GDPR-based (Berlin) FTC order (2021) and class action Strong, no ads
Wearables Apple Watch, Oura, WHOOP, Withings, Fitbit Apple Watch Apple Watch, Oura, Garmin
Languages 27 21 16 (web app)

Prices, wearables, and language counts come from each app's US App Store listing as of October 2026 (Clue, Flo). Veya figures are our own.

Want more detail? Keep reading.

What do you get with Clue?

Clue was founded in Berlin in 2012. It has a science-led, privacy-minded reputation. Here's what the app's listing and outside research support.

Features

  • Cycle tracking with science-backed predictions
  • Detailed symptom and mood logging
  • Gender-neutral, clinical design
  • Pregnancy among its listed tracking modes (alongside period, trying to conceive, and perimenopause)
  • Wearable connections, including Apple Watch, Oura, WHOOP, Withings, and Fitbit, per its listing
  • Available in 27 languages

Strengths

Clue's privacy pitch is GDPR. It's headquartered in Berlin, and its App Store listing says your data is protected by strict European privacy law (GDPR). If EU privacy law matters to you, that's a point in Clue's favor. Apple's privacy label on the same listing still shows identifiers used for tracking, so read the privacy policy either way.

The design is clean and no-nonsense. No pink flowers. No "girl talk" copy. Clue uses a clinical, gender-neutral approach that a lot of people prefer. A 2016 Obstetrics & Gynecology study that scored 20 accurate, free cycle apps included Clue; Clue says it earned the top score.

A science-led reputation. The 2016 study above is one outside data point. It's a decade old, so treat it as context rather than a current ranking.

Limitations

Deeper features sit behind Clue Plus. The app is free to download, and the listing prices Clue Plus at $39.99/year or $9.99/month (as of October 2026), describing Plus as adding deeper analysis, advanced predictions, and personalized insights. App Store reviewers mention frequent upgrade prompts in the free version.

Focused on cycle tracking. Clue's listing centers on cycle and symptom tracking and doesn't describe meal, workout, or habit logging. If you want those alongside your cycle, you may need a second app.

Wearables: Clue's listing says it works with Apple Watch, Oura, WHOOP, Withings, Fitbit, and more.

No AI assistant listed. Clue's listing doesn't mention a chatbot or AI-powered health Q&A.

Pricing

Free: Basic cycle and symptom tracking, with upgrade prompts.

Clue Plus: $39.99/year or $9.99/month in the US App Store (as of October 2026), adding deeper analysis, advanced predictions, and personalized insights.

Download: Available on iOS and Android

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What do you get with Flo?

Flo is one of the most widely used period trackers: its App Store listing cites over 570 million downloads worldwide (Flo's own figure, as of October 2026). That popularity comes with real advantages and some real baggage.

Features

  • Cycle tracking with AI-powered predictions
  • Daily articles and expert-backed content, per its listing
  • Virtual health assistant (Flo Premium)
  • Secret Chats for tips from other members (Premium, per its listing)
  • Pregnancy Mode with checklists and expert guidance (in-depth pregnancy features are Premium)
  • Apple Health integration
  • Apple Watch companion app

Strengths

A large content library. Flo's listing describes daily articles on topics like fetal development and expert-backed content. If you want to learn while you track, that's a real draw.

Community features. Flo's Secret Chats let you find tips from other members, though the listing places them in Premium. If you have a question about a symptom at 2am, someone else may have been through it.

Pregnancy Mode. Flo's listing includes Pregnancy Mode with checklists and expert guidance and puts in-depth pregnancy features under Premium. Clue's listing also includes pregnancy among its modes, so compare both before paying.

Limitations

Privacy history. Flo settled FTC allegations in 2021 that it shared sensitive health data with companies including Facebook and Google despite its privacy promises; the FTC order required consent before sharing health data and carried no fine. A separate class action over the same 2016–2019 data sharing reached a proposed $59.5M settlement with Google, Flo and Flurry (Flo’s share: $8M; the defendants deny wrongdoing). It received preliminary approval in April 2026, with a final approval hearing set for October 29, 2026. Flo has since added Anonymous Mode, which its listing describes as using the app without personal identifiers linked to your health data.

Premium upsells. The virtual health assistant, Secret Chats, and in-depth pregnancy features are listed under Premium, with annual plans listed at $47.99–$59.99 (as of October 2026).

Focused on cycle tracking. Like Clue, Flo's listing doesn't describe meal, habit, or sleep logging.

Wearables: the listing says Flo is compatible with Apple Watch. We didn't find Oura, Garmin, or Fitbit integrations listed.

Pricing

Free: Free to download, with core tracking tools included, per the listing.

Flo Premium: annual plans are listed at $47.99–$59.99 in the US App Store (as of October 2026). Premium is listed as adding the virtual health assistant, Secret Chats, and in-depth pregnancy features.

Download: Available on iOS and Android

Is there a third option besides Clue and Flo?

All three apps track the cycle on its own, and none of them connects mood, sleep or food to the phase you're in.

Veya logs those alongside your cycle and shows how they move across phases. If you're leaving Flo, you can import your cycle history from a screenshot in the web app, so you don't start from a blank calendar. Your imported dates show up in your cycle history. Mood and sleep logging start the same day.

Checked October 24, 2026 against the current App Store listings and Veya's web app.

Veya is a newer app with a smaller community than Flo, and the full app is iPhone only, with a web app for everything else.

See how switching works

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or try it in the browser

Side-by-Side Feature Comparison

Here's every major feature compared across all three apps. Check marks mean the feature is included, locks mean it requires a paid subscription, and X marks mean we didn't find it listed.

Feature Clue Flo Veya
Cycle tracking ✅ ✅ ✅
Fertility tracking ✅ ✅ ✅
Pregnancy mode ✅ Listed mode ✅ Listed mode ✅
Mood tracking ⚠️ Basic ⚠️ Basic ✅ Detailed
Sleep tracking ❌ ❌ ✅
Nutrition tracking ❌ ❌ ✅
Fitness tracking ❌ ❌ ✅
Habit tracking ❌ ❌ ✅
Wearable integration ✅ Apple Watch, Oura, WHOOP, Withings, Fitbit ⚠️ Apple Watch ✅ Apple Watch, Oura, Garmin
AI assistant ❌ Not listed 🔒 Paid 🔒 Paid
Community ❌ Not listed 🔒 Secret Chats (Premium) ❌
Privacy practices ✅ GDPR-based (Berlin) ⚠️ FTC order and class action ✅ Strong, no ads
Free tier quality ⚠️ Limited + upsells ⚠️ Limited + Premium upsells ✅ Generous, no ads
Price (annual) $39.99/yr $47.99–$59.99/yr ~$49.99/yr

Should you choose Clue, Flo, or Veya?

There's no single "best" app. It depends on what you care about most. Here's the honest breakdown:

Choose Clue if:

  • EU privacy law (GDPR) matters to you and you want a company based in Germany
  • You want a clean, science-backed tracker without extra noise
  • You prefer a gender-neutral design
  • You need Android support
  • You're comfortable with a focused cycle tracker (no nutrition or fitness logging needed)

Choose Flo if:

  • You want community features like Secret Chats
  • Health education and articles are important to you
  • You want pregnancy checklists and guidance (check which parts are free)
  • You need Android support
  • You're comfortable with Flo's privacy practices (or willing to use Anonymous Mode)

Choose Veya if:

  • You want cycle, mood, sleep, fitness, nutrition, and habit tracking in one app
  • You track with a wearable (Apple Watch, Oura, or Garmin) and want that data connected to your cycle
  • You want to see how your lifestyle habits affect your cycle and symptoms
  • You want a free tier with no ads
  • You're on iOS (or okay using the web app on other platforms)

Which app handles your privacy better?

Period tracking data is sensitive. It includes information about your cycle, fertility, and pregnancy status. Here's what the public record shows for each app:

Clue: Berlin-based, GDPR

Clue is headquartered in Berlin, and its App Store listing says your data is protected by strict European privacy law (GDPR). Apple's privacy label on the listing shows identifiers used for tracking, so read Clue's privacy policy for what it collects and shares.

Flo: FTC order and class action

In June 2021 the FTC finalized an order against Flo over allegations that it shared sensitive health data from millions of users with marketing and analytics firms, including Facebook and Google, despite promising privacy. The order requires affirmative consent before sharing health information and an independent privacy review; it did not include a fine. A separate class action over the same 2016–2019 data sharing reached a proposed $59.5M settlement with Google, Flo and Flurry (Flo’s share: $8M; the defendants deny wrongdoing). It received preliminary approval in April 2026, with a final approval hearing set for October 29, 2026.

Flo has since added Anonymous Mode, which its listing describes as using the app without personal identifiers linked to your health data. Those are real steps, and the history is still worth knowing before you hand over your health data.

Veya: Privacy-Focused, Smaller Scale

Veya doesn't run ads and doesn't sell user data. The privacy practices are strong. That said, it's a newer, smaller company without the years of public scrutiny that Clue has gone through. It's a US-based company, so GDPR does not apply to it in the way it does to Clue, but the no-ads, no-data-selling approach is a meaningful commitment.

Frequently Asked Questions

Is Clue or Flo more accurate?

There's no published head-to-head accuracy comparison of the two apps that we know of. Both apps predict from the cycle data you log, and predictions generally improve with more logged cycles and get less reliable when cycles vary a lot. A 2016 Obstetrics and Gynecology study included Clue among 20 accurate, free cycle apps, but it is a decade old. If your cycles are irregular, focus on tracking patterns rather than relying on predictions from either app.

Which is better for privacy, Clue or Flo?

It depends on what you weigh. Clue is headquartered in Berlin, and its listing says your data is protected by strict European privacy law (GDPR). Flo settled FTC allegations in 2021 over sharing health data with companies including Facebook and Google; the order carried no fine. A separate class action over the same 2016–2019 data sharing reached a proposed $59.5M settlement with Google, Flo and Flurry (Flo’s share: $8M; the defendants deny wrongdoing). It received preliminary approval in April 2026, with a final approval hearing set for October 29, 2026. Flo has since added Anonymous Mode. Read each privacy policy and decide.

Is Clue really free?

The app is free to download, with in-app purchases. The listing prices Clue Plus at $39.99/year or $9.99/month (as of October 2026) and describes Plus as adding deeper analysis, advanced predictions, and personalized insights.

Does Flo sell your data?

We found no source saying Flo sells your data. What is documented: the FTC alleged that Flo shared sensitive health data with marketing and analytics firms, including Facebook and Google, despite promising privacy, and Flo settled those allegations in 2021 under an order requiring consent before sharing health information. A separate class action over the same 2016–2019 data sharing reached a proposed $59.5M settlement with Google, Flo and Flurry (Flo’s share: $8M; the defendants deny wrongdoing). It received preliminary approval in April 2026, with a final approval hearing set for October 29, 2026. Flo says it has changed its practices, and its listing now describes Anonymous Mode.

Can I use Clue or Flo for pregnancy?

Both list pregnancy among their modes. Flo's listing describes Pregnancy Mode with checklists and expert guidance and puts in-depth pregnancy features in Premium. Clue's listing lists pregnancy as a mode without saying which plan includes it. Compare both in the app before paying.

What's a good alternative to Clue and Flo?

Veya is worth considering if you want more than just cycle tracking. It includes mood, sleep, fitness, nutrition, and habit tracking in one app. It syncs with Apple Watch, Oura Ring, and Garmin, and shows you correlations between your lifestyle and your cycle. Most features are free with no ads. The downsides: it's iOS only (a web app is available for other platforms), it's a newer app, and the community is much smaller than Clue or Flo.

How do Clue, Flo, and Natural Cycles compare?

All three track your cycle, but they are built for different goals. Clue is science-led (Clue Plus $39.99/year), Flo has a large content library and community (Flo Premium annual plans $47.99–$59.99), and Natural Cycles is the only one of the three that is FDA-cleared as birth control, using basal body temperature ($21.99/month or $149.99/year in the App Store, as of October 2026). For general cycle and symptom tracking, Clue and Flo are closer competitors. If you want a hormone-free, app-based contraception method, Natural Cycles is the distinct option.

Clue vs Flo vs Natural Cycles: which has the best free version?

Clue and Flo are both free to download with in-app purchases, while Natural Cycles is subscription-based ($21.99/month or $149.99/year as of October 2026; we didn't find a free tier listed). Between Clue and Flo, Flo's listing puts in-depth pregnancy features in Premium, and Clue's listing doesn't say which plan includes pregnancy mode, so compare them in the app. If a free option matters most, Clue or Flo is the place to start. Natural Cycles is worth it if you specifically want its contraception feature.

Which is best for privacy: Clue, Flo, or Natural Cycles?

Each has a different footing. Clue is headquartered in Berlin and says its data is protected by GDPR. Flo settled FTC allegations in 2021 and is part of a proposed $59.5M class action settlement over sharing health data with companies including Facebook and Google, though it has since added Anonymous Mode. Natural Cycles is an FDA-regulated medical device, so review its current privacy policy if app-based contraception data is your concern.

Want to See More Apps Compared?

This guide focused on Clue vs Flo, but there are other great options out there. If you want the full picture, check out our complete comparison of 6 period tracking apps, including Ovia, Natural Cycles, and more.

Read the full comparison: Best Period Tracker App 2026 (6 Apps Compared) →

If you are also weighing the free built-in option, Flo vs Clue vs Apple Health Cycle Tracking adds Apple's Cycle Tracking to this comparison.

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