Flo vs Clue for Partners: Which One Actually Helps You
Flo and Clue are both solid, credible trackers for her. As partner tools, they are not close: Flo's partner mode is free for both of you, while Clue's requires her to pay for Clue Plus before she can share anything with you at all. That covers the short version. Here's the full picture: what each app actually shows you, what it costs, and where both still fall short of what a partner needs.
Flo vs Clue, quickly, as trackers for her
Before the partner question, the trackers themselves. Both are established apps with tens of millions of users between them, and both are built on real cycle-tracking science, developed with input from clinical researchers rather than pulled out of thin air. Flo has the bigger install base and the heavier content library, with articles, symptom explainers, and pregnancy tracking that goes well past period prediction. Clue leans clinical: a plainer interface, fewer bells, and a reputation as the more research-driven, less "wellness brand" of the pair.
Neither is obviously better for her. It comes down to whether she wants a content-rich health app or a stripped-back cycle log, and that's her call to make. This piece stays narrowly on Flo and Clue, because that's the comparison you're actually facing as a partner.
Partner sharing head to head: Flo for Partners vs Clue Connect
Once you get past the tracker itself, the differences show up fast.
- Cost. Flo for Partners costs nothing on either side. Neither of you needs Flo Premium. Clue Connect is free to view but not free to send: she needs Clue Plus to share her cycle with you, roughly £24.99 a year in the UK or about $39.99 a year in the US, with the exact figure moving by region and promotion. If she isn't already paying for Clue, "just link up" quietly turns into "one of us starts a subscription."
- What you actually see. Flo shows her current phase as short "cycle stories," predicted period and ovulation windows, push notifications when her phase changes, and general educational tips; deeper articles, videos and quizzes sit behind Flo Premium, which neither of you needs for the partner view itself. Clue Connect shows a plain calendar: period days, fertile window, ovulation, PMS days, and nothing beyond that. Neither app shows her logged symptoms, private notes, or day-to-day history, and neither lets you edit anything.
- Who initiates. Both require her to start it. She generates the code or invite link and sends it to you; there's no route for you to request access and have her approve it afterwards. The first move is always hers, on both apps.
- Notifications. Flo pushes you a heads-up when her phase changes, so you find out without opening the app. Clue Connect hands you a calendar you have to check yourself, which means the work of noticing falls on you instead of the app.
Both features are covered in full elsewhere on this site: what Flo for Partners actually shows you, and the complete Clue Connect breakdown, including setup steps and the one-person, one-way limit Clue puts on sharing.
Privacy records compared
Flo's history is public record. In 2021 the US Federal Trade Commission settled with Flo Health after finding it had shared sensitive health data, including pregnancy status, with Facebook, Google, and analytics firms despite promising users that information would stay private. The settlement barred future health-data sharing without consent and required independent privacy assessments for years afterwards, not a one-off fix. In 2025 a California jury found Meta liable in a related case over the use of reproductive-health data for targeted ads, and reporting at the time said Google and Flo had reached separate settlements with affected users. Flo has since changed its practices and added an anonymous mode that lets her track without a name or account attached, a direct result of the settlement rather than something Flo volunteered on its own.
Clue's picture reads differently. It's built by BioWink, a Berlin company, so it sits under GDPR by default rather than treating privacy as an optional feature bolted on later. Clue has no FTC-style settlement or comparable enforcement action on public record as of this writing, and its public statements go further than most, including a stated commitment not to sell health data to advertisers or data brokers. This is a cleaner record, though still an account-based system: Clue stores your data on its own servers, which means it can in principle be reached by a court order, and it hasn't gone through independent third-party privacy certification. Being based in Germany also means Clue answers to EU regulators first, which is a stricter starting point than the US market Flo was built for.
Net effect: if an enforcement record is what you're weighing, Clue currently has the better one, though "better" here means a cleaner history rather than an empty one. Both apps still sync her cycle to an account on their own servers, which is a different privacy model entirely from something that never leaves your phone.
Which to pick, by scenario
If she already uses Flo daily, link up through Flo for Partners: no cost, low friction, about two minutes to set up on both phones. If she already uses Clue and already pays for Plus, Clue Connect costs nothing extra at that point, so there's no reason not to switch it on.
The harder case is her being on Clue's free tier while you want the partner view. That means someone starting a subscription that wasn't already planned, just to unlock a four-event calendar, and it's worth a conversation between the two of you rather than something you assume she'll say yes to. If she's lukewarm about paying for an app upgrade purely so you can see her calendar, treat that hesitation as useful information in itself.
If privacy is genuinely the deciding factor, Clue has the cleaner corporate history, though as covered above that's a lower bar than it sounds, since both apps still store her cycle on a server somewhere. And if what matters most is a partner view that costs nobody anything, regardless of which tracker she prefers, Flo is the one that doesn't ask either of you to pay for it.
The catch with both
Underneath the differences sits the same problem. Both apps were built for her, and the partner view was added afterwards. Neither hands you the "what do I do" version of her cycle, only the "where is she" version. Flo gives you a bit more surface: named phases, push alerts, some reading material. Clue gives you a leaner calendar and a stronger privacy story. Neither tells you that the reason she's short with you on day 24 is hormonal rather than personal, or that what actually helps on day one is heat and quiet rather than a conversation.
That gap matters more than either comparison above, and it's identical whichever tracker she picks. Our breakdown of the menstrual cycle phases for partners closes it, translating "she's in the luteal phase" into what tends to help and what tends to backfire. Our guide on how to support her during her period covers the same ground for the days that hurt most.
Where Yuni fits
Yuni isn't competing with Flo or Clue as her tracker, and it doesn't ask her to link anything to your phone. There's no invite code, no partner mode to switch on, no Premium or Clue Plus required from either of you. It's an iOS app built specifically for the partner: you enter what you know about her cycle, and Yuni turns the phase into daily guidance, what's likely going on, what tends to help, what to avoid saying today. Its Heads Up mode flags the harder days before they land, so you're prepared rather than reacting after the fact.
Everything stays on your device: no account, no cloud sync, nothing handed to an advertiser, so it doesn't carry either company's history. It isn't free, and it's worth saying that plainly rather than dodging it. What you're paying for is the part neither Flo nor Clue builds: translation, not just visibility.
Common questions
Is Flo better than Clue? It depends what you're weighing. As a tracker for her, Flo has the bigger educational library and dataset, while Clue has the cleaner, more clinical interface and a stronger privacy default with no FTC-style history on record. For her own cycle it's close and largely down to personal preference. For you as the partner, Flo edges ahead because its partner mode is free, while Clue's requires her to pay for Clue Plus.
Is Clue Connect free? Viewing her cycle is free, but sharing it isn't. She needs a paid Clue Plus subscription, roughly £24.99 a year in the UK or about $39.99 a year in the US, before Clue Connect will send anything to your phone. Prices vary by region and promotion, so treat those figures as approximate.
Which period tracker is best for couples? If a free, low-friction partner view matters most, Flo. If she already pays for Clue Plus, Clue Connect works just as well at no extra cost. If what you actually want is daily, actionable guidance rather than a calendar, neither one fully delivers. That's the specific gap apps like Yuni are built to close.
Can partners see more on Flo or Clue? Flo gives slightly more: named cycle phases presented as short stories, predicted period and ovulation windows, push notifications on phase change, and general educational tips (deeper content and quizzes sit behind Flo Premium, not the free partner view). Clue Connect gives a leaner calendar: period days, fertile window, ovulation, and PMS days, and nothing more. Neither app shows her logged symptoms or personal notes to you, on either platform.
Yuni skips the tracker debate entirely and tells you what to actually do today, with no linking, no subscription on her side, and nothing but your phone.
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