How Did He Know? (HDHK) is a revolutionary app that delivers daily, customized tips to help men become better husbands and partner—and reap the rewards that come from happy, fulfilling relationships.

With the HDHK app, men receive on tip every day about how they can best meet their wives’ needs. Using a proprietary algorithm and data you supply about your partner and her monthly cycle, HDHK can anticipate your wife’s needs—before she even knows them! Daily, customized tips will help you understand your wife’s monthly changes—physically and emotionally—and provide you with insight to ‘wow’ her each and every day.

Features include:
- Daily relationship hacks to help you quickly and easily strengthen your marriage
- Advice, tips and suggestions based on science and data about women
- Customization options to personalize tips for parents or non-parents
- Editable calendar to keep track of important dates in your relationship
- Exclusive offers for HDHK users to save on hotels, clothing, flowers, wine and more
- In-app access to articles, blogs and professionals to help you improve your relationship

Why use HDHK? Here are a few things to consider. Did you know happily married men:

- Make more money
- Have a higher rate of home ownership
- Raise more successful children
- Live longer
- Save more in investment accounts
- Report lower stress levels
- Volunteer more hours
- Have healthier friendships

Are you ready to get serious about building your marriage? Download HDHK to start becoming a better husband today!

Note: Period Tracker is built for entertainment purposes only. No medical advice or birth control methods should be modified based on any app. Please seek advice from a medical doctor first.

What's New

Version 1.8.6

- New icon and splash screen.
- Updated code to be Swift 3.1 compliant.
- Tweaked some transition animation.
- Added iOS10 rating dialog.
- Internal enhancements.

Ratings and Reviews

4.5 out of 5

27 Ratings

27 Ratings

Better than the one my wife has

Sozo LLC

She wants to know what I use to track her because mine is working better than hers. She wants to know if they have a version for women.

Surprisingly Accurate


I've been following the advice on this app for about 4 months. Really impressed my wife with how accurate the app is with where she's at in her cycle. It's helped me to get through the tough stages and helped me to know when the good parts are happening.

The links to articles are really useful.

I'd love to see more varieties of ideas and ways I can surprise and take care of my wife. Maybe random times during the month, have a dozen or so suggested things to do like "buy your wife flowers or a greeting card today" or "send your wife a text message right now and remind her how beautiful she is" or "cancel something to make room for her this week"

Great app to help strengthen relationships.

Izzy Rock

It's tough to know what's going on daily with my wife. Some days she's in a great mood, other days she seems tired and grumpy.

After downloading and using this app, I get a clear picture of some of the things going on with my wife after matching her cycle up with this app.

Great daily tips that are so on point it's freaky. Now that I know what to expect based on her monthly cycle, I can meet her needs daily by being more aware and the rewards I receive are worth downloading this app.


Mobile Mutations, LLC.
25.1 MB
Health & Fitness
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
You must be at least 17 years old to download this app.
Frequent/Intense Mature/Suggestive Themes
© 2018 HDHK LLC. All Rights Reserved.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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