# Every other app was built for her. Yuni was built for you.

> Yuni vs Flo, Clue, Stardust & Natural Cycles — the only period tracker built for the partner, not her. Compared for 2026.

Flo, Stardust, Clue, Natural Cycles, Lively, Premom — they're all great at tracking her cycle. Not one of them tells you what to do with that information. That's the gap Yuni fills.

[Get Yuni](https://yuniapp.co.uk/start?src=compare&ct=compare_hub_hero&lang=en): answer a few questions and get her 28-day plan.

## The short version

Seven apps. One fundamental difference.

| | Flo | Stardust | Clue | Natural Cycles | Lively | Premom | Yuni |
|---|---|---|---|---|---|---|---|
| Built for the partner | No | No | No | No | No | No | Yes |
| No account required | No | No | No | No | No | No | Yes, on iPhone |
| Data stays on device | No | No | No | No | No | No | Without an account |
| Daily guidance for you | Partial | Nudges only | No | No | Partial | No | Yes — 5 modes |
| Apple Watch widget | No | No | No | No | No | No | Yes |
| Lock Screen widget | No | No | No | No | No | No | Yes |
| Free to use | Free tier | Yes | Free tier | ~$150/yr | Free tier | Free tier | 3 free days |
| Clean privacy record | FTC settlement | Disputed | Strong | Class action | OK | FTC action | Clean |

## Three things no other app gives you

### A perspective built for you

Every competitor app was designed for the person tracking their cycle. The partner is an afterthought — a notification recipient, a calendar viewer. Yuni flips it: you are the primary user.

### Daily "what to do today"

Knowing she's in her luteal phase doesn't tell you what to do. Yuni translates each phase into specific, actionable guidance — what to say, what to avoid, what she needs right now.

### The account is optional

The iPhone app works with no account: her cycle stays on your device, and we hold nothing of hers on our servers. Sign in only if you want it on your other devices, in the browser, or shared with her. Every other app on this list makes the account mandatory.

## How Yuni compares to each

### Flo Period & Ovulation Tracker

Built for women / people menstruating · 77M monthly users · FTC settlement

Flo is the dominant period tracker — #1 by market share, 77 million monthly active users, $275M revenue — and it is excellent at helping women understand their own cycle with clinical-grade predictions. In October 2023 it launched **Flo for Partners**, the closest any competitor has come to Yuni's territory: she shares a code, you install Flo, and you get a read-only calendar plus daily "story cards" about what she might be feeling. The framing is almost entirely fertility and TTC (trying to conceive) — when she's ovulating, not how to show up during PMS — and you can't use it independently, since it requires her to be an active Flo subscriber who invites you in.

On privacy: in 2021 the FTC settled with Flo over sharing intimate health data — menstrual dates, pregnancy status, fertility intentions — with Facebook, Google, and other ad platforms despite explicit privacy promises. Flo had to notify all affected users and have third parties destroy the data. Its later "Anonymous Mode" is a PR response, not a privacy-first design.

**Where Yuni fills the gap:** built for the partner from the ground up, not added on. You don't need her on any app. The iPhone app asks for no account, so there is nothing of hers on our servers to settle over — and the guidance is about emotional support and daily relationship dynamics, not fertility windows.

### Stardust Period Tracker

Built for women / people menstruating · Disputed privacy

Stardust is a cycle tracker with a cosmic twist — moon phases, daily affirmations, a community sharing feed. It **does have a Partner Mode**: she invites you with a code and you get push notifications like "be extra considerate today." But the partner experience is entirely notification-driven — no dedicated guidance, no daily actions, no context about what the phase means for how you should behave. You get a ping; you don't get a playbook. Stardust also requires a phone number or account, and a 2022 investigation by TechCrunch and Privacy International found its privacy claims weren't airtight: third-party SDKs were present that could expose data.

**Where Yuni fills the gap:** the full picture, not just a notification — 5 phase modes with real daily guidance, an Apple Watch app with today's advice, and no account on iPhone.

### Clue Period & Cycle Tracker

Built for women / people menstruating · Strong privacy

Clue is one of the best-regarded period trackers: science-backed, GDPR-compliant, headquartered in Berlin, and excellent if she wants to track 200+ health factors with clinical rigour. It even has **Clue Connect**, a paid sharing feature giving you a read-only view of her period dates. But a calendar of her period dates tells you nothing about how to be supportive — no guidance for you, no phase explanation, no "here's what she needs during PMS." Clue Connect also requires a Clue Plus subscription ($40/year) for the sharing side, plus a full account with cloud storage.

**Where Yuni fills the gap:** Yuni doesn't just show you when her period is — it tells you what to do about it, every day, for all 5 phases. The iPhone app asks for no account, and you start with 3 free days.

### Natural Cycles Fertility App

Built for women managing fertility / contraception · Class action

Natural Cycles is FDA-cleared as a contraceptive, using basal body temperature to predict fertile and non-fertile days. It serves a specific medical purpose and is not a cycle tracker in the general sense. There are **no partner features whatsoever** — no sharing, no guidance, no way to use it as a partner. It also requires daily temperature measurement, a mandatory subscription (~$150/year), and cloud storage of very sensitive health data. A 2025 class action alleges Natural Cycles embedded trackers from third-party advertisers — including TikTok and Google — that transmitted users' reproductive health data without consent.

**Where Yuni fills the gap:** no daily logging, no account on iPhone, and you start with 3 free days. It's designed to give you — the partner — daily phase-specific guidance, not to manage fertility.

### Lively — Period Tracker, Cycle

Built for women / wellness-focused cycle syncing · OK privacy

Lively is the closest competitor in concept, taking a "cycle syncing" approach that tailors nutrition, exercise, and mood advice to each phase. Its **Partner Syncing** feature lets partners see the current phase, energy level, and a mood indicator she can update, and send a "thinking of you" nudge. But it still lives inside an app fundamentally designed for the person menstruating: the partner interface has no dedicated home screen, no daily guidance specific to the partner's role, and no explanation of what each phase means for relationship dynamics. There's no Apple Watch or Lock Screen widget for the partner either — to check her phase you open the app, navigate to partner view, and find it.

**Where Yuni fills the gap:** built partner-first, not bolted-on. You open the app and see today's mode and what to do; the Apple Watch app carries the same advice. The iPhone app needs no account, and setup takes 30 seconds.

### Premom Ovulation Tracker & BBT

Built for women trying to conceive (TTC) · FTC action

Premom is a fertility app for people trying to conceive: it reads LH test strips via your phone camera, charts basal body temperature via Bluetooth thermometers, and predicts fertile windows with high accuracy. It's excellent for that purpose, but there are **no partner features**, it isn't relevant to general cycle phase awareness or relationship support, and it's tightly coupled to hardware (branded test strips and thermometer), creating vendor lock-in. In 2023 the FTC charged Easy Healthcare, Premom's developer, with sharing sensitive reproductive health data with third-party analytics firms, including two based in China; the company paid $200,000 in civil penalties and was barred from sharing health data for advertising.

**Where Yuni fills the gap:** Yuni is not a fertility app — it's a relationship tool, giving the partner daily guidance through every phase of a normal cycle. Without an account, there is no data of hers to mishandle.

## Side-by-side breakdowns

If you're choosing between Yuni and a specific app she already uses (or one she's considering), these head-to-head comparisons go deeper than the table above.

- [Yuni vs Flo](https://yuniapp.co.uk/compare/yuni-vs-flo/) — If she's on Flo, you don't switch her. You add Yuni for yourself.
- [Yuni vs Clue](https://yuniapp.co.uk/compare/yuni-vs-clue/) — Clue is the cycle scientist. Yuni is what she sends her partner.
- [Yuni vs Natural Cycles](https://yuniapp.co.uk/compare/yuni-vs-natural-cycles/) — Natural Cycles is her birth control. Yuni is your daily guide.
- [Yuni vs Lively](https://yuniapp.co.uk/compare/yuni-vs-lively/) — Lively bolts on a partner view. Yuni is built partner-first.

## A completely different category

Period trackers are great at what they do. Flo, Clue, and Stardust are genuinely impressive products — for the person tracking their own cycle. Even Flo's partner feature, the most ambitious attempt at this, still treats the partner as a secondary user of a woman's app.

Yuni doesn't compete with any of them. It fills the gap they all left open: the partner who wants to show up better, understand what she's going through, and know exactly how to help — without needing her to be on any app, without needing her to explain it every month.

The account is optional. Just enter her cycle dates once and Yuni handles the rest.

## Understand the cycle, together

A few questions about her, then a plan for her next 28 days. [Try Yuni](https://yuniapp.co.uk/start?src=compare&ct=compare_hub_bottom&lang=en)

---

Canonical HTML: https://yuniapp.co.uk/compare/
Machine-readable index: https://yuniapp.co.uk/llms.txt
Part of: https://yuniapp.co.uk/.well-known/ai-catalog.json