Discreet by design.
The app name doesn't say "period tracker." The icon doesn't either. AsterKit blends into your home screen — only you know what it is.
DESIGNED BY A TEEN · BUILT BY HER DAD
Simple Cycle Prep.
A discreet, private period tracker for teens. No accounts. No cloud. No data leaves your phone.
7-day free trial · One-time $4.99 · No subscription
Built for our daughter. Built so we’d let her use it.
0serversNo accounts.
0trackersNo analytics.
100%on-deviceEncrypted locally.
EVERYTHING IN, NOTHING EXTRA.
What’s inside.
Designed to feel calm and obvious from the first tap.
Your data, your phone.
Cycle data is encrypted on your device by the operating system's keychain. We have no servers. We literally cannot see what you log.
Made for real teens.
No medical jargon, no community feed, no friend requests. Just a calendar and a simple log. Set up in under two minutes.
Predictions, after enough history.
AsterKit starts estimating future periods after three or more logged cycles. Predictions stay labeled as estimates — never as medical advice.
Parent-approved purchase.
A parent or guardian completes a short setup, approves the one-time $4.99 purchase, and the trial begins. AsterKit never shares the log with the parent.
Useful, never noisy.
Optional gentle reminders for upcoming periods. No marketing pushes, no streak nags, no notifications you didn't ask for.
Ready for the doctor.
When a doctor asks "when was your last period?" — you'll know. AsterKit keeps a clean history you can glance at in seconds. Not medical advice; just the dates, ready when you need them.
SETUP IN UNDER TWO MINUTES.
How AsterKit works.
One parent. One purchase. One quiet app on a teen’s phone.
- 1
Parent sets it up.
A parent or guardian completes a quick setup and approves the one-time $4.99 purchase. The 7-day trial starts right after.
- 2
Teen logs the cycle.
Open the calendar, tap a day, mark start or end. Add symptoms or mood if you want — or skip them entirely.
- 3
AsterKit stays out of the way.
Predictions get smarter quietly in the background. No notifications you didn't ask for. No data leaving the phone.
OUR ONE RULE
Health data belongs to the body it’s about.
We built AsterKit on one rule. Cycle data is encrypted on your device by the operating system’s keychain. It never moves. There is no copy on a server, because there is no server. Uninstalling the app deletes everything — because there is nothing on our end to delete.
Read our Privacy PolicyWHAT IT LOOKS LIKE.
Simple, by design.
Real screens from the app, from first setup to everyday logging.
WHY WE BUILT THIS.
A father-and-daughter project.
Our daughter is a teenager. She wanted a period tracker that worked for her — simple enough to glance at, private enough that nothing left her phone, and clear enough to answer her doctor when asked.
So we built it. She designed the screens. Her dad wrote the code. Every privacy decision in this app started with one question — would we be comfortable with our own teenage daughter using it?
AsterKit is what we’d want our own kid to use. We hope it’s what you’d want yours to use too.
A small family team. No investors. No analytics. No agenda.
THE RECEIPTS.
Why AsterKit feels different.
A side-by-side with what’s typical.
Accounts required
AsterKit
NoTypical
Yes (email, often social login)Data stored on servers
AsterKit
NoTypical
Yes (cloud, often outside your country)Third-party analytics
AsterKit
NoneTypical
Three to eight SDKs typicalAdvertising
AsterKit
NoneTypical
Yes — your cycle is used for ad targetingHealth-data sharing
AsterKit
NoneTypical
Often shared with marketing partnersNotifications you didn’t pick
AsterKit
NeverTypical
FrequentSubscription
AsterKit
NoneTypical
$50–$100 per year typicalPrice
AsterKit
$4.99 onceTypical
$50–$100 per yearONE PRICE, FOREVER.
Try it. Then keep it.
Seven days free. If it’s right, unlock the full app once — and never hear from billing again.
7-DAY FREE TRIAL
$4.99
one-time purchase
- Unlimited cycle logging
- Period predictions (after 3+ cycles)
- Symptoms and mood
- History and insights
- Fertility window (premium)
- Dark mode
- Discreet app-icon options
No subscription · no renewal · refunds handled by Apple or Google
QUICK ANSWERS.