Get on the same page, before the day starts.
A short forecast every morning built around where she is in her cycle — what phase she's in, what that often means, and what you can actually do about it. Send her the invite and she sees exactly what you see.
The full daily product free for 7 days · No credit card · She can opt out any time
How it works
Simple enough to start today
Four steps, nothing to install, and she can see everything you see.
Enter her cycle date — or don't
If you know when her last period started, enter it. If you don't, say so and we'll ask her instead. Guessing produces confidently wrong forecasts for weeks, so we'd rather leave it blank.
Loop her in — one tap
She gets a plain-language note explaining what you signed up for, with a link to her own page. No app, no account, no password. She can set the date, correct it later, or stop the whole thing from there.
You each get your own email
Yours covers where she is in her cycle and a few things you might do. Hers is written to her — where she is, what tends to help, and a plain summary of what you were told. Same facts, two perspectives, no surprises.
We ask again around day 26
Cycles restart, and a date nobody updates is the main reason these tools drift into nonsense. We nudge whoever actually knows — her if she's in, you if she isn't — and it's one tap to update.
What you'll receive
This is the whole thing
One email each morning. Not a dashboard to check, not an app to open. Here is a real one — and she gets the same email if she wants it.
Hey Sina, here's today's forecast for Anna.
Sensitivity to stress today
Elevated
Typical for this phase — it varies a lot person to person.
Overview
Anna is on day 24, which puts her in the late luteal stretch — the week or so before a period starts. Progesterone and estrogen are both falling, and that drop is linked to lower serotonin activity.
For a lot of people that shows up as a shorter fuse for ordinary friction. For plenty of others it does not show up at all.
How Anna is feeling
Today may land a little heavier than a day mid-cycle would. Small annoyances can feel bigger than they logically are.
That said, this is a pattern across a population, not a reading of Anna. She knows how she feels far better than this forecast does.
Tips for you today
- · Ask how she is actually doing, and take the answer at face value.
- · Take one thing off her plate without announcing it.
- · If something needs deciding, see whether it can wait.
For Anna
You're in the late luteal phase. If you feel more sensitive to stress this week, there is a known mechanism behind it — and if you don't, that's equally normal.
- No invented statistics
- An earlier version of this email led with a made-up percentage. A cycle date cannot produce one, so it now says only what it can actually support.
- Written so she can read it
- Every briefing is written on the assumption she is reading over your shoulder — because once you invite her, she is.
- Something to do, not just know
- Two to four concrete suggestions, at least one of which is simply asking her how she is doing.
Why email
No app. For either of you.
Every other tool in this category is an app you both have to download, set up, and remember to open. The two of you already have email. We thought that was enough.
| Feature | Happy Husband | Typical app-based tool |
|---|---|---|
| Setup time | About 30 seconds | Two app installs and an account each |
| What she has to install | Nothing — it arrives by email or text | The app, plus an account and a password |
| How she joins | One tap from your invite; she sees the same forecasts | She signs up separately and links to you |
| Works on | Any phone that gets email or texts | Recent iOS or Android only |
| Where it shows up | Your inbox, once each morning | Push notifications through the day |
| If she wants out | She opts out from the invite; we stop | Usually a settings menu inside her own account |
Low friction is the point — not low visibility. She can see everything you see, from the moment you invite her.
Why it works
What the research actually says
Happy Husband is an awareness tool, not a prediction engine. Here's the evidence it rests on — including the parts that argue for humility.
The hormones are real. The mood effect is uneven.[1]
Estrogen and progesterone genuinely rise and fall across the cycle — that part isn't in dispute. What varies is whether it shows up in mood. A review of 47 prospective studies found that 18 of them — nearly 40% — found no association between mood and any cycle phase at all.
Sensitivity differs person to person, not hormone to hormone.[2]
In a controlled NEJM study, women with PMS and women without it were given the same hormone manipulations. The women with PMS saw their symptoms return; the women without had no mood change whatsoever. The hormones were identical — the sensitivity to them wasn't. This is the single best reason to ask her rather than assume.
Severe cyclical mood change is the minority case.[3]
A 2024 meta-analysis put premenstrual dysphoric disorder at roughly 3% of menstruating people under confirmed diagnosis, and about 8% under looser criteria. Milder premenstrual symptoms are far more common — but 'most people have some' is a very different claim from 'your partner will'.
What this means for you: a cycle-phase forecast is a reasonable prior, not a fact about your partner. Some people track closely to it. Plenty don't. The forecast is a prompt to check in — and the fastest way to find out whether it's right about her is to let her see it and tell you.
Sources
- [1] Romans, S., Clarkson, R., Einstein, G., Petrovic, M., & Stewart, D. (2012). Mood and the Menstrual Cycle: A Review of Prospective Data Studies. Gender Medicine, 9(5), 361–384. View source
- [2] Schmidt, P. J., Nieman, L. K., Danaceau, M. A., Adams, L. F., & Rubinow, D. R. (1998). Differential Behavioral Effects of Gonadal Steroids in Women with and in Those without Premenstrual Syndrome. New England Journal of Medicine, 338(4), 209–216. View source
- [3] Reilly, T. J., et al. (2024). The prevalence of premenstrual dysphoric disorder: Systematic review and meta-analysis. Journal of Affective Disorders. View source
Be among the first to use it
Happy Husband is brand new. Early users get the full product at launch pricing — and direct access to shape what it becomes.
Privacy
Exactly what we hold, and what we do with it
This is health data about someone who is not our customer. We think that earns you a straight answer rather than a padlock icon.
About her
- The date her last cycle started
- Her first name, only if you enter one, and only to personalize your email
- Roughly how long the two of you have been together
That is the complete list. No symptoms, no health history, no location, no contacts.
About you
- Your name and email address
- Your delivery preferences — what time of day it arrives, and in what tone
- A Stripe customer reference, if you subscribe
Card details go straight to Stripe and never touch our servers.
- Where is it stored?
- Google Cloud Firestore, in the United States. Google encrypts all of it at rest by default, and it travels over HTTPS.
- Who can see it?
- You can. Our database rules restrict every user record to the account that owns it, so no other customer can read yours. A small number of our own administrator accounts can access records for support and debugging.
- Can she see it?
- Yes, once you send the invite — that is the point of it. She can view the same forecasts, correct her own cycle dates, or tell us to stop.
- How long do you keep it?
- Thirty days after a subscription ends, we delete the account and everything in it automatically. We email you about a week before that happens. Resubscribing stops the clock.
- Do you sell or share it?
- No. We do not sell, rent, or share your data or hers with anyone. We use Google Analytics for aggregate traffic on this website, and Stripe for payments. That is the full list of third parties.
- How do I delete it?
- Settings has a delete button. It removes your account, her cycle dates, your payment history and her access link, and cancels your subscription first. It is immediate and permanent — we keep no backup copy.
The full detail is in our Privacy Policy.
Pricing
Your first 7 days are free.
A forecast every morning for a week, with no card and no plan to pick. If it earns a place in your morning, there is one plan afterwards.
Your first 7 days
Most popular
$0free
- •A forecast every morning for a week. The whole product, not a sample.
- •No card, and no plan to choose. It simply stops unless you decide to carry on.
- Daily forecast by email
- One-tap invite so she sees it too
- Her own daily email, if she wants one
After that
$9/month
- •The same thing every morning, for as long as it stays useful.
- •Cancel whenever you like — we delete everything 30 days later.
- Daily forecast by email
- Shared access for your partner
- She can correct her own cycle dates
- Full cycle history
FAQ
Questions? We have answers.
Should I tell my partner?
Yes — and we make it easy. Guys who share it get better results, because she can correct the dates and tell you what's actually going on. Setup takes 30 seconds and there's a one-tap invite at the end. If she'd rather not be part of it, she can opt out from that same message and we stop.
What does she actually see?
Whatever you see. When you send the invite she gets a plain-language note explaining what you signed up for, a link to the same forecasts, and the ability to fix her own cycle dates or turn the whole thing off. There is no version of this that runs behind her back.
How accurate are the forecasts?
Honestly: they're an approximation. We model a 28-day cycle, and most cycles fall somewhere between 24 and 38 days, so the phase timing drifts for a lot of people. Updating her actual start date — or letting her update it herself — is what makes it sharper. We don't publish an accuracy number because we don't have one we could defend.
What does a typical forecast email look like?
It shows the cycle day, the current phase, a plain-language note on what that phase typically involves, and three to five concrete things you might do that day. Scroll up to see a real example.
Is this based on real science?
It's based on real research, with real limits. Hormonal changes across the menstrual cycle are well documented, and a substantial share of people who menstruate report cycle-linked changes in mood or energy. But effect sizes vary enormously between individuals, and a large proportion report little or no cyclical mood change at all. Happy Husband is a prompt to pay attention, not a prediction engine. See the sources on our Why it works section.
What does it cost?
Your first 7 days are free — the full daily product, no card, and no plan to choose at signup. After that it is $9 a month if you want to carry on, and nothing happens automatically if you don't.
What if she has an irregular cycle?
Then the timing will be off unless someone keeps the start date current, and she is the person best placed to do that — which is the main practical reason to invite her in. The behavioural suggestions still hold; it's the phase timing that shifts.
What happens to her data?
We store her cycle start date, her first name if you give it, and roughly how long you have been together — nothing else about her. We do not sell or share any of it. To delete everything, there is a delete button in settings — it is immediate and permanent. We also delete accounts automatically 30 days after a subscription ends, and warn you first. Full detail is in the privacy section above.
Referral Program
Share it. Both of you win.
Refer a friend and you both get 1 free month free when they complete onboarding. Rewards stack — there's no limit.
Share your link
Every member gets a unique referral link.
Friend completes onboarding
The referral is confirmed once they finish setup.
Both get rewarded
A free month each, for you and your friend.
Start the day on the same page.
The full daily product free for 7 days · No credit card · She can opt out any time