Know Her vs
Flo for Partners
You don't own the tool, you rent a window into hers — and it closes the day she stops paying or stops logging.
★ Yours, not borrowed from her app
You don't own the tool, you rent a window into hers — and it closes the day she stops paying or stops logging.
You're not the customer on Flo for Partners. She is. You just get to look over her shoulder, on her terms.
Flo built one of the world's best period-tracking apps — for women. Then they bolted on a "partner view" so someone else could peek in. It's still her product: her account holds the data, her subscription keeps it running, her decision to invite you (or not) gates the whole thing. Nothing about it was designed to answer a man's actual question. Know Her started from that question instead: what does the man actually need to know? The language, the phases, the widget, the daily tip — all of it built for you, not repurposed from a product built for her.
Before you see a single thing, this has to happen first.
Read that list again: five things have to go right, and none of them are up to you. That's not a tool. That's a permission you can lose at any time.
No account from her. No subscription from her. No invitation. Know Her is fully yours, from day one — 100% offline, locked behind Face ID if you want.
Know Her vs Flo for Partners, side by side.
| Know Her | Flo for Partners | |
|---|---|---|
| Built for male partners | ✓ Purpose-built | Added as a feature |
| Requires action from her | ✓ No — you do it yourself | ✗ Invitation required |
| Requires her subscription | ✓ No | ✗ Flo Premium ($39.99/yr) |
| Works if she stops tracking | ✓ Yes — predictions are yours | ✗ No — depends on her logging |
| 100% offline | ✓ Yes | ✗ Cloud-based |
| No account needed | ✓ Yes | ✗ Requires Flo account |
| Home screen widget | ✓ Yes | ✗ No |
| Phase-change notifications | ✓ Yes — day before | Limited |
| Face ID / biometric lock | ✓ Yes | ✗ No |
| Private notes on the calendar | ✓ Yes — offline, only yours | ✗ No |
| Language designed for men | ✓ Plain, practical | Women's health terminology |
| Predictions self-calibrate | ✓ Yes — learns her cycle | Reflects her logged data |
| Your price | $2.99/mo — 14-day free trial | Depends on her Premium plan |
What the app was built to solve changes everything about how it works.
Where your data lives is a design decision, not a technicality.
Know Her stores everything on your device. Period history, notes, settings — none of it is uploaded anywhere. There is no server holding her cycle data. No breach can expose what doesn't exist in the cloud. You can lock the app behind Face ID, and the data stays entirely yours.
Flo for Partners syncs through Flo's cloud infrastructure. Both your account and her account are online. Your access to her cycle data is mediated by Flo's servers, Flo's privacy policy, and her continued consent to share. That's a different kind of relationship with sensitive health information.
What it actually costs as a couple.
Then $19.99/year (or $2.99/month). One app, one subscription — yours. No other accounts or plans required. Cancel anytime.
She must maintain Flo Premium — that's the price of the feature, and it's hers to pay, not yours. Know Her requires no subscription from her at all.
At least $20 less per year — and it's your own subscription, not hers.
About choosing between Know Her and Flo for Partners.
See how Know Her stacks up against other apps.
Available on
iOS & Android.
Free for 14 days.
No commitment. Cancel anytime.
