Clue vs Natural Cycles: Which One Should You Use?

Choose Natural Cycles if you want an app the FDA has cleared as birth control. Choose Clue if you want a science-first period tracker, which says it should not be used as a contraceptive. Veya, our app, is also a tracker and not birth control; it suits people who want sleep, mood and nutrition logged alongside their cycle.

By Veya Team • Published June 8, 2026 • Last reviewed October 9, 2026 • 9 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 it's relevant. We've done our best to compare each app fairly based on publicly available features, pricing, and user reviews, checked in early June 2026 and re-checked against primary sources in October 2026. If Clue or Natural Cycles is the better fit for you, use it.

Quick Answer

Clue and Natural Cycles are not the same kind of app. Natural Cycles suits you if you want an app the FDA has cleared as contraception, which confirms ovulation from your temperature. Clue suits you for science-first period tracking with strong privacy, though it is not birth control. And for all-in-one tracking of cycle, mood, sleep, nutrition, and habits in one free app, Veya is worth a look. Here's how they compare:

  • If you want birth control you can rely on: Go with Natural Cycles. It is FDA-cleared as birth control (De Novo, 2018) and uses your daily temperature to confirm ovulation.
  • If you want a science-first period tracker with strong privacy: Go with Clue. Berlin-based, research-backed, and great for understanding your cycle, but it is not birth control.
  • If you want all-in-one tracking (cycle + mood + sleep + nutrition + habits) for free: Try Veya.
This article is educational and not medical advice. Choosing a birth control method is a decision to make with a healthcare provider who knows your history.

Clue and Natural Cycles show up in the same searches constantly, and the question underneath most of them is some version of "can I use this as birth control." That's the right question to ask, because it's where these two apps split apart. Clue is a period tracker that predicts your cycle. Natural Cycles is a birth control method that lives in an app.

One estimates your fertile days from the data you log. The other was cleared by the FDA in 2018 as the first birth control app, and it confirms ovulation from your daily temperature. If you're choosing between them, the real question isn't "which app is better," it's "do I want a tracker or do I want a method." We'll walk through what each one does, clear up the confusion around Clue's old birth control product, and add a third option for a different need.

The Short Version

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

Clue Natural Cycles Veya
Best for Science-first cycle tracking App-based birth control All-in-one tracking
FDA-cleared as birth control No (see note) Yes (2018) No
How it works Calendar and symptom predictions Confirms ovulation by temperature Cycle + lifestyle tracking
Platform iOS + Android iOS + Android iOS only (+ web app)
Free tier Yes, usable No (trial only) Most features, no ads
Price $39.99/year (Clue Plus) Subscription only (thermometer included); see naturalcycles.com ~$49.99/year
Privacy base Berlin, GDPR Regulated device US, no ads, no data selling

Want more detail? Keep reading.

What Is the Difference Between a Period Tracker and a Birth Control Method?

Here's the part that matters most, so it's worth saying plainly before the feature lists.

Clue predicts. It looks at the cycle and symptom data you log and estimates when your period and fertile window will probably happen. Clue's science-first approach is well regarded, but those estimates aren't measuring what your body is doing on a given day, and Clue does not present itself as birth control.

Natural Cycles measures. It uses your basal body temperature to confirm whether you've ovulated, then tells you whether today is a "green day" (not fertile) or a "red day" (use protection or abstain). That measurement is part of why the FDA could clear it as contraception (see the FDA De Novo record DEN170052). As a method, Natural Cycles reports 93% effectiveness with typical use and 98% with perfect use, per Natural Cycles' own effectiveness page; typical use includes unprotected sex on red days.

One important note on what "the app is your birth control" actually means: on red days, Natural Cycles tells you to abstain or use a barrier method. The app does not physically prevent pregnancy. It tells you which days carry risk so you can act on it. Keep that in mind as you read on.

Is Clue FDA-Cleared as Birth Control?

This trips a lot of people up, so it's worth clearing up directly. You may have read that Clue is FDA-cleared as birth control. There's a real reason that idea is floating around, and a real reason it doesn't help you today.

What's true and what isn't

  • It was cleared. The FDA cleared a product called Clue Birth Control (applicant Biowink GmbH) on February 18, 2021, per the FDA 510(k) record K193330.
  • The app you download is a tracker. Check Clue directly to see whether Clue Birth Control is offered to the general public today if that is what you want.
  • Clue says don't. Clue's App Store listing says "Clue should not be used as a contraceptive" (see Clue's App Store listing, as of October 2026).

The short version: the FDA clearance was real, but it isn't something you can use right now. If app-based contraception is your goal, Natural Cycles is the cleared option we could confirm is on offer.

Clue: What You Get

Clue is a well-known period tracker with a clean, no-frills design and a science-first reputation. It's made by a Berlin-based company that works with academic researchers, and it's a favorite for people who want to understand their cycle without pink branding or guesswork. Just know going in that it's a tracker, not a contraceptive.

Features

  • Cycle, period, and PMS tracking with predictions that learn your pattern
  • Wide range of symptom, mood, energy, and body categories to log
  • Fertile-window and ovulation estimates (Clue Conceive for trying to conceive)
  • Science-backed content written and reviewed with experts
  • Cycle history and stats that show your patterns over time
  • Apple Health integration
  • Gender-neutral, inclusive design

Strengths

The free tier is genuinely usable. You can track your cycle, log a wide range of symptoms, and get predictions without paying. For a lot of people, free Clue is enough.

It's built on science, not vibes. Clue partners with researchers and is careful about the claims it makes. If you want a tracker that takes accuracy seriously and doesn't overpromise, that reputation is well earned.

Strong privacy posture. Clue is based in Berlin under GDPR and has long made data protection part of its brand, and Clue's privacy policy says the sensitive health data you track is never shared with or sold to advertisers. More on that in the privacy section.

Limitations

It is not birth control. This is the big one for this comparison. Clue's fertile-window estimates are predictions, not confirmation of ovulation, and Clue's own guidance says not to use it as contraception.

Predictions weaken with very irregular cycles. Clue handles variability better than many trackers, but calendar-and-symptom estimates still get less precise when cycles swing a lot, which is common with PCOS or perimenopause.

Deeper features are paywalled. Some analysis and modes sit behind Clue Plus.

Pricing

Free: Cycle and symptom tracking, predictions, and stats.

Clue Plus: $39.99/year or $9.99/month on Clue's App Store listing (as of October 2026). Adds deeper analysis and extra features.

Download: Available on iOS and Android

📆 Period Calculator

Predict your next 6 periods instantly.

Try It Free

Natural Cycles: What You Get

Natural Cycles is a different animal. The FDA granted its De Novo request on August 10, 2018 (see the FDA De Novo record DEN170052), and it's the app most people mean when they say "the birth control app." It's hormone-free, and it works by learning your cycle from your temperature.

Features

  • FDA-cleared birth control based on basal body temperature
  • Also cleared to plan pregnancy (one app, two modes)
  • Daily "green day / red day" fertility status
  • Confirms ovulation rather than only predicting it
  • Reads temperature from the included thermometer, an Oura Ring, or an Apple Watch (per Natural Cycles' effectiveness page; check its site for current device support)
  • Optional LH test logging
  • FSA/HSA eligible

Strengths

It's an actual method, not a guess. Because it measures temperature and confirms ovulation, Natural Cycles can be used as birth control. It reports 93% effectiveness with typical use and 98% with perfect use (source). If app-based contraception is what you're after, this is the cleared option.

Hormone-free. For people who can't or don't want to use hormonal birth control, a temperature-based method is a real alternative worth discussing with a provider.

It works with wearables you may already own. If you have an Oura Ring or an Apple Watch, you may be able to skip the manual morning thermometer and let the wearable handle temperature.

Limitations

It needs daily temperature data. The method depends on a reading each day, so disrupted sleep, travel, and irregular schedules can degrade its accuracy.

It confirms ovulation after it happens. Early on, before it has learned your pattern, you'll see more red days as a buffer, so it gives less advance notice in those first months.

It's a weaker fit for very irregular cycles. The company notes the method works best with reasonably regular cycles, so it's less suited to PCOS.

No free tier and it's the pricier option. There's a trial, but no permanent free version, and the subscription plus any wearable adds up.

Pricing

Subscription only: Natural Cycles' shop page says a thermometer comes with the subscription and a trial is available (as of October 2026). Plans and promotions change, so check naturalcycles.com for current rates.

Download: Available on iOS and Android, or at naturalcycles.com

🥚 Ovulation Calculator

Find your fertile window and ovulation day.

Try It Free

The Third Option: Veya

Clue and Natural Cycles sit at two ends of a line: one is a free, focused tracker, the other is a paid method. Veya is a different shape. It's built to track your whole health picture in one place, not just your cycle. It's worth knowing about, but it's honest to say up front: like Clue, it is not birth control.

What It Adds

  • Cycle tracking with automatic phase detection and fertility predictions
  • BBT from Apple Watch, Oura Ring, or Garmin, plus manual LH and cervical mucus logging
  • Mood, sleep, fitness, and nutrition tracking built in
  • Custom habit tracking with auto-updating streaks
  • Correlation insights showing how your lifestyle affects your cycle
  • Pregnancy mode, plus PCOS and perimenopause support
  • No ads, no data selling

Why Consider It

The pitch is that you don't need three apps. Instead of one app for your cycle, another for food, and a third for mood, Veya puts it together and then shows the connections, like how your sleep affects your mood in the luteal phase. The free tier includes most features with no ads, which is a real difference when Natural Cycles has no free tier at all and Clue paywalls its deeper analysis.

Honest Limitations

  • Not birth control. Veya is a tracker. It is not FDA-cleared as contraception. If app-based birth control is your goal, Natural Cycles is the cleared option.
  • iOS only. There's no Android app yet. A web app is available, but the full experience is iPhone-only right now, where both Clue and Natural Cycles are on both platforms.
  • Newer and smaller. It doesn't have Clue's years of reputation or research partnerships, and it's a younger app with fewer reviews.
  • AI features are premium. The AI assistant (Ask Veya) requires a subscription (~$9.99/month or ~$49.99/year).

Pricing

Free: Cycle, mood, sleep, fitness, nutrition, and habit tracking. No ads.

Premium: ~$9.99/month or ~$49.99/year for AI features and advanced insights.

Download: Available on iOS App Store

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, warnings mean it's limited, and X marks mean it's not available.

Feature Clue Natural Cycles Veya
Cycle and period tracking ✅ ✅ ✅
FDA-cleared as birth control ❌ ✅ ❌
Confirms ovulation (temperature) ❌ ✅ ✅ With wearable
Fertile-window prediction ✅ ✅ ✅
Symptom and mood logging depth ✅ Extensive ❌ ✅ Detailed
LH test logging ⚠️ Basic ✅ ✅
Wearable integration ⚠️ Apple Health ✅ Oura, Apple Watch ✅ Apple Watch, Oura, Garmin
Sleep, nutrition, fitness tracking ❌ ❌ ✅ Detailed
Science-backed content ✅ Strong ⚠️ Some ⚠️ Some
Pregnancy mode ⚠️ Conceive mode ✅ ✅
AI assistant ❌ ❌ 🔒 Paid
Privacy practices ✅ Berlin, GDPR ✅ Regulated device ✅ Strong, no ads
Free tier ✅ Usable ❌ Trial only ✅ Generous, no ads
Price (annual) ~$39.99/yr Subscription only ~$49.99/yr

Should You Choose Clue, Natural Cycles, or Veya?

There's no single "best" app here, because they're built for different jobs. Here's the honest breakdown:

Choose Clue if:

  • You want a science-first period tracker and don't need it to be birth control
  • You like to log detailed symptoms and understand your patterns over time
  • Strong privacy and a research-backed reputation matter to you
  • You want a clean, inclusive design and a usable free tier
  • Your cycles vary and you want a tracker that handles that well

Choose Natural Cycles if:

  • You want app-based birth control that's actually cleared and available for it
  • You prefer a hormone-free method and have talked it through with a provider
  • You already own an Oura Ring or an Apple Watch
  • You have reasonably regular cycles and a consistent sleep routine
  • You're willing to pay and to take a temperature reading each day

Choose Veya if:

  • You want cycle, mood, sleep, fitness, nutrition, and habit tracking in one app
  • You track with a wearable and want that data connected to your cycle
  • You want to see how your lifestyle affects your cycle and symptoms
  • You want a generous free tier with no ads
  • You don't need the app itself to be your birth control method

Which Is Better for Privacy, Clue or Natural Cycles?

Cycle and fertility data is some of the most sensitive information you can put in an app, so privacy deserves real attention. The good news with this pairing is that both apps have a solid footing, which isn't always the case in this category.

Clue: Berlin-Based, Privacy as a Brand

Clue is made by a Berlin-based company and operates under GDPR, Europe's strict data protection law. It has long made privacy part of its identity, and its privacy policy says tracked health data is never sold to advertisers (the policy does describe sharing some non-health app events with ad networks). For people who got nervous about period-app data after the headlines of recent years, Clue's posture is one of the reasons it stayed a trusted name.

Natural Cycles: A Regulated Device, EU-Based

Natural Cycles is a regulated medical device, which comes with its own set of data obligations. That regulated status is a different footing than a general tracker. As with any health app, it's worth reading the current privacy policy so you know what's collected and shared.

Veya: Privacy-Focused, Smaller Scale

Veya doesn't run ads and doesn't sell user data. It's a newer, smaller, US-based company without the years of public scrutiny the bigger names have been through, and there's no GDPR certification. The no-ads, no-data-selling approach is a meaningful commitment, just at a smaller scale.

Frequently Asked Questions

Can you use Clue as birth control?

Clue is a period and cycle tracker, not a contraceptive. Clue's own app guidance states it should not be used as birth control, and its predictions are not cleared by the FDA to prevent pregnancy. Natural Cycles is the app that is FDA-cleared as birth control, and it works differently: it confirms ovulation from your daily temperature rather than estimating fertile days from your calendar. If you want an app you can actually rely on as a method, that is the distinction that separates these two.

What happened to Clue Birth Control?

The FDA cleared Clue Birth Control on February 18, 2021, which is why you may still see it described online as an FDA-cleared option. Check Clue directly to see whether it is offered to the general public today. Clue's App Store listing says Clue should not be used as a contraceptive. If you want app-based contraception, Natural Cycles is the cleared option covered here.

Is Clue or Natural Cycles better for privacy?

Clue is made in Berlin and says its data handling meets German and EU legal requirements; its policy says tracked health data is never sold to advertisers. Natural Cycles is a regulated medical device, which carries its own data obligations. As always, read each current privacy policy so you know what is collected and shared before you commit.

Is Clue or Natural Cycles cheaper?

Clue is cheaper to start with. Clue has a usable free tier, and Clue Plus is $39.99 per year on the App Store (as of October 2026). Natural Cycles is subscription only, includes a thermometer with the subscription, and offers a trial rather than a permanent free tier. The gap makes sense once you know what you are paying for: Clue is a tracker, while Natural Cycles is a regulated medical device you are paying to use as a contraceptive method. Prices shift with promotions, so check each app before subscribing.

Which works better for irregular cycles?

As a tracker, Clue's App Store listing says you can track symptoms even without regular bleeding. As a birth control method, Natural Cycles works best with reasonably regular cycles and a consistent sleep routine, because it depends on daily temperature, so it is a weaker fit for very irregular cycles or PCOS. If your cycles are unpredictable and you mainly want to understand them, Clue is the flexible option. If you want a method, that is a conversation to have with a provider about whether temperature-based tracking suits your cycles.

Can Natural Cycles also track my period like Clue?

Natural Cycles logs your period and predicts upcoming cycles alongside its fertility status, so it covers the basics of period tracking. What it does not do is match Clue's depth as a general tracker, with Clue's wide symptom categories, science-backed content, and flexible logging. If period and symptom tracking is your main goal, Clue does more for less. If you want a contraceptive method that also keeps an eye on your cycle, Natural Cycles covers both.

Want to See More Apps Compared?

This guide focused on Clue vs Natural Cycles, but there are other options worth a look depending on what you need. If you're weighing Clue against the other big tracker, or you want to know how accurate any of these predictions really are, these go deeper.

Read next: Clue vs Flo: Which Period Tracker Is Actually Better? →

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