From the day you start waiting for your child until the day they turn eighteen, hiYou is where a parent leaves letters for their child, one at a time. You don't have to write it perfectly — just keep the small things you don't want to forget.
What is hiYou
Your child doesn't yet know what you were thinking today. hiYou keeps that in a letter, so you can hand it to them when the time comes. You don't have to write every day. Some days a single photo, some days one line — that's plenty.
Three ways to keep it
Type it, or speak and let it write itself. Add a photo or a short voice note. With one tap you choose whether it's a letter to your child or a private note between the two of you.
Pick a day to open it — "on their 18th birthday," "on their wedding day." Until that day no one can read it, and when it arrives, your phone lets you know quietly.
Mom and dad fill one shared journal together. Both of your entries from the same day sit side by side. One of you can start, and the other can join later.
Little moments
This isn't an app for tracking numbers. It's a few small tools that turn the feeling of a day into a letter. All optional — leave them off if you'd rather.
How many weeks along, how many days until the due date, and how big the baby is this week — in a familiar comparison, like "about the size of a strawberry now." A gentle nudge for what to write.
Looks back at the small changes in your Apple Watch / Health data from before you knew — a quiet, moving "my body knew before I did" moment.
Feel a parent's own heartbeat brought back as a gentle vibration in your hand. Not a medical reading — just a way to keep the rhythm of that day as a feeling.
Rest the phone on your belly to count kicks, and mark special moments — a first kick, the day you learned the gender — with a star you can find again later.
Whenever you like, your letters become one book (PDF), opening with a note "to you, who will read this." You can also export a backup file that opens even if the app is gone — safe to keep for many years.
A gentle option for if something painful happens. It softens the colors, stops the reminders, and lets you quietly set things aside. It never rushes you.
Our promise
Nothing is more private than the letters you leave for your child. So hiYou simply doesn't have a company server to receive them. No jargon needed — the promise is this simple.
Letters stay on your phoneEvery letter, photo and voice note is kept on your own phone. No sign-up, no login.
Writing together goes only through your own iCloudWhen mom and dad write together, everything travels through your own iCloud — our company server isn't in the middle.
We don't store your child's contact infoWhen you seal a letter, we never ask for your child's phone or email. You pick how to deliver it on the day itself.
Health & location never leave the phoneHealth data is used only to look back, and location for weather is kept to the city name — the exact spot is never stored.
No ads, no hidden trackingThere are no ads or usage-tracking tools inside. Delete the app and the records on your phone go with it.
The full details are laid out in plain words in our Privacy Policy.
The 'Hello' family
If hiYou is a letter to your child, HiDay — made in the same spirit — is a hello to yourself at the end of the day. Both are built on the same promise: your writing never leaves your phone.
A voice & text journal that greets you differently each day, weaving together time, weather and yesterday's memory. On iPhone, iPad, Mac and Android.
Price
Writing letters, sealing them, keeping a shared journal, exporting your book — the core stays free. Pro touches, like gently polishing your words, are free to try for the first month.
Right now it's version 0.5 · putting on the finishing touches.
Want to hear when it launches? Send us a note and we'll reach out first.
Where it works
FAQ
Not at all. Three letters one day, one letter a whole month — all fine. You can tap "just skip today" and move on. Never rushing you is the thing hiYou cares about most.
We don't ask for your child's contact info when you seal it — no one knows which way of reaching them will still exist in 18 years. Instead, on the day it opens, your phone lets you know, and helps you send it however's easiest then — a message, an email, and so on.
Yes. hiYou is with you not just through pregnancy but until your child turns eighteen — first steps, first words, first day of school. You can keep leaving those moments.
Of course. Start as a single parent and have your partner join later — the same journal simply continues. Or keep writing solo the whole way; that's perfectly fine too.
You can export everything anytime as one book (PDF) and as a backup file that opens even without the app. Keep that file in your own cloud or on a computer and it's safe for the long run.