For the great women, the one reading these words right now.

I made this app because I watched the great women in my life — quietly carrying the changes in their bodies every month, yet unable to find a tool that wouldn't interrupt them, wouldn't push sales at them, wouldn't quietly collect their data.

The apps out there either work hard to get you opening them every single day, or quietly sell your body data to advertisers. We didn't want to build something like that. We wanted to build an app that every woman would feel safe opening.

What makes us different is that we genuinely respect your experience. Zero ads across the whole app — the free version and the paid version are the same, and there is no ad SDK in the binary at all.

I welcome everyone to use this app for free. Most features are open to everyone — we won't lock away basic features just because you haven't paid.

Servers, development, and store releases all cost money. If you find this app helpful and want to support me to keep going:

• Subscribe to Premium (US$3.99/month or US$24.99/year) — unlocks more personalized AI readings and advanced charts. Whether free or paid, there will be no ads.

But I have to be honest: the difference between the paid version and the free version really isn't that big. Premium is mainly more personalized AI readings and a few advanced charts. If you feel the free version is enough, please keep using it — never force yourself to pay.

Premium comes with a 7-day free trial. During these days you can experience more personalized AI readings (300 per month on Premium) and advanced charts.

If you never intended to pay in the first place, cancel the subscription right after starting the trial — that way you won't be charged automatically when the 7 days end, and you can still use the trial in full. How to cancel:

• iPhone: Settings → Apple ID → Subscriptions → QiFlux → Cancel
• Android: Google Play → Account → Subscriptions → QiFlux → Cancel

Please never feel "I accidentally subscribed and now I'm stuck." That was never what I wanted. Cancel early and you won't be charged, and you can still use the trial to the end.

Whether or not you pay, simply that you're willing to open this app, willing to use it to track your own body — to me, that's already the greatest affirmation.

I'll keep improving it within my means. If one day you find a bug, have an idea, or simply want to say something, please leave a review on the App Store or Google Play — I read every single one personally. Public reviews also help others who are still hesitating.

Thank you for everything. I hope this app can offer you a little quiet company on certain nights of certain months.

— Yves, Taipei · 2026