Know Her vs
Yuni

"Free" is the hook. $6.99/week is what it actually costs once the trial's over — more than Know Her, permanently.

★  Cheaper, not just cheaper-looking
Know Her period tracker app — home screen widget showing her cycle phase

"Free" gets you through the door. The bill shows up the moment you'd actually rely on the app day to day.

Both Yuni and Know Her are period trackers built for men — no jargon, no relationship coaching, just what phase she's in. But "free" only describes the trial. Once it ends, keeping the features that actually make Yuni useful — daily guidance, streaks, weekly insights — costs $6.99/week or $39.99/year. That's more than double Know Her's $19.99/year, for an app that isn't explicit about whether it even learns her cycle over time. Know Her's price doesn't change after the trial, and it never asked you to guess anything to begin with.

What each app actually asks you to know

Before you see a single thing, this has to happen first.

Yuni

  • Her average cycle length — offered as an optional picker (26/28/30/32 days) during setup, not a hard requirement.
  • Not explicit about self-calibration — weekly insights read back what you log, but the site doesn't clearly state predictions improve over time.
  • Free trial, then a subscription — $6.99/week or $39.99/year once the trial ends.

A generous trial is still a trial. What it turns into costs more than double what Know Her charges, forever.

Know Her

  • The date her last period started. That's it. No cycle-length picker at all.

Starts with research-backed averages and self-calibrates every cycle — for less than Yuni's ongoing price.

Feature comparison

Know Her vs Yuni, side by side.

Know Her Yuni
Built for male partners ✓ Purpose-built ✓ Purpose-built
She needs no app or account ✓ Yes ✓ Yes
You need an account to log in ✓ No ✓ No — no account required on iPhone
No cycle-length step ✓ Only needs last period date Optional picker (26/28/30/32 days)
Predictions self-calibrate ✓ Yes — learns her cycle Not clearly stated
100% offline ✓ Yes ✓ Yes
Home screen widget ✓ Yes ✗ Not on iPhone home screen
Apple Watch app ✗ Not currently ✓ Yes
Face ID / biometric lock ✓ Yes ✗ Not listed
Private notes on the calendar ✓ Yes — offline, only yours ✗ No
Your price $2.99/mo — 14-day free trial $6.99/week or $39.99/yr after trial

Design intent matters

What the app was built to solve changes everything about how it works.

Know Her

  • ✓ Only needs her last period date — no cycle-length guess
  • ✓ Self-calibrates to her specific cycle over time
  • ✓ Dashboard: energy, mood, tips in plain language
  • ✓ Widget: one-tap phase check from the home screen
  • ✓ Private notes and reminders on the calendar
  • ✓ Face ID lock for extra privacy

Yuni

  • ✓ Free to download, full-access trial included
  • ✓ Apple Watch app and a web version
  • ✗ Costs more per year once the trial ends
  • ✗ Not clear whether predictions improve over time
  • ✗ No home screen widget on iPhone
  • ✗ No private notes layer

Price comparison

What it actually costs you.

Know Her Free to download — full access for 14 days

Then $19.99/year (or $2.99/month). Self-calibrates over time, home screen widget, Face ID lock, private notes.

Yuni $39.99 per year — or $6.99/week

Free to download with a full-access trial. Once it ends, keeping daily guidance, streaks, and weekly insights costs more per year than Know Her.

Both are free to try. After the trial, Know Her is cheaper than Yuni — $19.99/year vs $39.99/year.

Common questions

About choosing between Know Her and Yuni.

It's offered as an optional step during setup — a quick picker with preset options (26, 28, 30, or 32 days) rather than a number you have to know exactly. Know Her skips this step entirely: you only enter the date her last period started, and it estimates the rest using research from over 600,000 real cycles.
Yuni's own site isn't explicit about this — its weekly insights feature reads back what you've logged, which suggests some ongoing refinement, but it doesn't clearly state that predictions self-calibrate. Know Her is explicit about it: every confirmed period makes its predictions more accurate to her specific cycle.
Yuni is free to download with a free trial that includes full access. After the trial, a subscription is required to keep daily guidance, streaks, and weekly insights — plans start at $6.99/week or $39.99/year. Know Her is free to download, with a 14-day trial that includes full access, then $19.99/year (or $2.99/month) — meaningfully cheaper than Yuni's ongoing subscription.
Yes. Know Her stores everything on your device — no account, no cloud, no sync. All data stays on your phone. You can lock it with Face ID or biometrics for extra privacy.
No. Know Her works entirely from information you enter yourself — no account for her, nothing to install, nothing to share. You just need the date her last period started. She doesn't even need to know you're using it.
Yes. Everything stays on your phone — no account, no cloud, no sync, nothing to leak. You can lock the app with Face ID or biometrics for extra privacy on top of that.
You get 14 days of full access, completely free. After that, Know Her runs on a simple subscription — monthly or annual. Cancel anytime directly in your App Store settings.
No. Know Her is designed to help you understand and plan around her cycle — it's not a medical device, diagnostic tool, or method of contraception. For health decisions, always consult a healthcare professional.

More comparisons

See how Know Her stacks up against other apps.

Know Her vs Flo for Partners Know Her vs Clue Connect Know Her vs Stardust Know Her vs Selin Know Her vs Maya Know Her vs Phases Know Her vs GF Tracker Know Her vs DuoSync Know Her vs Mayday

Available on
iOS & Android.

Free for 14 days.

No commitment. Cancel anytime.

Download on the App Store
Get it on Google Play