Cluevs
Flo
Flo: If you want to compare a competing app with a different ownership and regulatory history before choosing
Clue
Period and cycle tracking app owned by German company Biowink, positioned around science based tracking and a published stance against sharing data with law enforcement
As of 1 September 2026, Clue is free to use. A menstrual cycle tracking app built by Berlin-based Biowink, which markets itself specifically on scientific rigour and data protection under EU rules, and has publicly stated it will not share reproductive health data with law enforcement without a valid legal process and will resist requests it believes are improper. Softwr lists it under Healthcare. Clue is made by Biowink GmbH, available on iOS, Android.
Overview
What Clue does
Clue tracks periods, ovulation, symptoms and mood, generating cycle predictions and pattern insights from logged data, with the company positioning the app around scientific advisory input and research partnerships rather than lifestyle content as its main differentiator from competitors like Flo. Data handling is the central fact for this category and Clue has made it central to its own marketing, which still needs to be checked against the actual published policy rather than taken at face value. Clue is a German company operating under EU data protection law (GDPR), and it publishes a privacy policy stating it does not sell personal data to advertisers and does not share health data with law enforcement or public authorities without a legally binding request, adding that it would challenge requests it considers improper; the company has also stated its EU legal base makes it harder for US authorities to compel disclosure than for a US-based competitor. These are the vendors published claims and stated legal position, not an independent guarantee, and a user with specific legal concerns in a hostile jurisdiction should verify current policy language directly rather than rely on marketing summaries, including this one. Buyers are people who want cycle tracking and are specifically weighing data jurisdiction and legal exposure alongside app quality, given the same reproductive health data sensitivity that applies to Flo. The trade-off against Flo is stated positioning: Clue markets itself heavily on the strength of EU-based data protection and a public no-law-enforcement-sharing stance, while Flo operates under a settlement history that a buyer should weigh in the other direction; comparing the two on their current published privacy policies, not just brand reputation, is the right way to decide.
What people use it for
- Someone specifically weighing data jurisdiction and legal exposure when choosing a period tracking app, given Clues EU basis and published stance on law enforcement requests
- A user who wants cycle tracking positioned around scientific research partnerships rather than lifestyle or community content
- A buyer comparing Clue directly against Flo on current published privacy policy language before choosing which app to trust
- Someone tracking perimenopause or other non-standard cycle stages that some period apps do not support well
Related searches
The honest half
Where it falls short
Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about Clue.
- Clues stated policy on not sharing data with law enforcement without a valid legal process is the companys own published position and legal interpretation, not an independent guarantee, and it can still be compelled to comply with a legally binding request under EU or other applicable law.
- Deeper cycle insights and predictions, the features most likely to justify tracking in the first place, are gated behind the Clue Plus subscription rather than fully free.
- Being a smaller company than some competitors, Clue has less capital and legal resource to contest large-scale legal requests than a larger, better-funded rival might, despite its stated intent to do so.
- Research partnerships using anonymised user data, while opt-in, still mean user-derived data can be used in ways beyond direct app functionality, and users should check current consent settings.
- Cycle predictions rely on self-reported data and general population models, so accuracy for irregular cycles or specific medical conditions remains limited regardless of which app is used.
Cross-shopped
What people choose instead of Clue
Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.
- CluevsPeanut
Peanut: If you want a community focused app for fertility, pregnancy and early parenting rather than cycle tracking specifically
Pricing
What Clue costs
Taken from the vendor's own pricing page. Prices move, so check before you buy.
Clue Plus
$9.99 /mo
- Free tier covers core cycle tracking, logging and basic predictions
- Clue Plus adds deeper cycle insights, extended predictions and personalised content
- Annual Plus plans typically offered at a lower effective monthly rate
- No option publicly listed to pay for the app without any data processing at all
Capabilities
Features
Cycle and symptom tracking
Logged period, ovulation, symptom and mood data used to generate predictions
Cycle insights and patterns
Pattern recognition across logged cycles, deeper insights on Clue Plus
Research partnerships
Clue has run academic research studies using opt-in anonymised user data
EU-based data hosting
Company states data is handled under EU GDPR rules as a German entity
Fertility and conception mode
Ovulation and fertile window tracking for users trying to conceive
Perimenopause and other life stage tracking
Tracking modes beyond the standard reproductive years cycle
Answered, with sources
Questions people ask
Each answer names the page it came from, so you can check it rather than take our word for it.
Does Clue share data with law enforcement?
Clue publishes a policy stating it does not share health data with law enforcement or public authorities without a legally binding request and states it will challenge requests it considers improper. This is the companys stated position; verify the current policy directly for specifics.
Why does Clue emphasise being an EU company?
Clue operates under EU GDPR data protection rules and states this legal basis makes it harder for authorities outside the EU, including US authorities, to compel data disclosure than for a company based in the US.
Is Clue free?
Core cycle tracking, logging and basic predictions are free. Deeper insights and extended predictions require Clue Plus.
Keep looking
Where to go from Clue
- Clue alternativesEvery product people weigh against it
- Clue pricingPlans, floors and what the tiers exclude
- Clue badgesWhich rules it meets, and the figure behind each
- All Healthcare softwareThe full category
- Best Healthcare softwareThe shortlist, and how it was cut
Best Healthcare software for
Compare Clue with
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- PioneerRx
- Rad AI
- Therapixel
- Athenahealth
- Lyra Health
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Softwr does not host reviews and shows no star rating for Clue, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.
More on Clue
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Its rating, and an embed for your own site
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