A private family baby tracker

Your baby's routine is nobody else's business.

Joey is the baby tracker we built for our own family. It logs feeds, sleeps, nappies, pumps and growth, and keeps both parents' phones in step. Everything is encrypted before it leaves the phone, so we can't read your data. We built it that way on purpose.

There's no account to create and no advertising in the app. See how the privacy works ↓

Joey home screen: feeding, sleep and nappy cards with how long since each, and today's totals

6 amnoon6 pmmidnight6 am

FeedsSleepsNappies

What it does

Why we built it

We built Joey because the apps we tried made simple things hard. Logging a feed or a nappy should take one tap from the home screen, and you should be able to read the whole day at a glance. You should also know where your baby's data goes, and none of those apps could tell us. So we sorted out privacy first: everything is encrypted on the phone and nobody needs an account. Then we made Joey work on iPhone and Android, because plenty of families have one of each, and kept the phones in sync. It's made by MedApps, an Australian company that writes software for hospitals, and it gets the same care.

One feeding story: Breastfeeds and bottles sit together in one daily view, so there are no separate reports to add up at 3am. Joey suggests which side is next and remembers every switch mid-feed. When a bottle ends, it asks how many mL.
Log from the lock screen: A running timer sits on the lock screen and in the Dynamic Island, with buttons you can press. You can switch sides or stop a feed without unlocking the phone. When one parent stops a timer, it disappears from the other parent's lock screen within seconds.
Both parents, both platforms: Joey works the same way on iPhone and Android, home-screen widgets included, so it doesn't matter which phone each parent has.
Growth on real curves: Joey includes the WHO growth charts from birth to 24 months, with centile lines from the 3rd to the 97th, drawn from the WHO's own reference data. None of it sits behind a paywall.
Charts you can read half-asleep: See the last seven days as one pattern, or tap a day to see its full 24 hours. Joey shows you the pattern and leaves the conclusions to you.
In plain Australian: Joey is written in Australian English throughout. It says nappy and mL, because "diaper" was starting to grate.

See it

The whole day at a glance, from either parent's phone.

Joey home screen with a bottle feed timer running above the day's feeds, sleeps and nappies — A bottle feed running on the home screen, started with one tap.

iPhone lock screen with a Joey breastfeed timer running as a Live Activity, with buttons to switch sides, move to the bottle and stop — A breastfeed on the lock screen: switch sides or move to the bottle without unlocking.

WHO growth centile chart in Joey, weight plotted against the reference curves — The WHO growth charts, from birth to 24 months.

Widgets

Twelve widgets, so the app rarely needs opening.

Each widget is a set of real buttons on the home screen. You can start a breastfeed on either side, switch sides, log a nappy, or start and stop a sleep or a pump without opening the app. Joey queues every tap before it handles it, so a press is never lost, even when the phone is slow.

iPhone home screen with the Joey Recent activity widget (pump, nappy and breastfeed, each with how long ago) beside the Feeding widget with its Left, Right and Bottle tiles — iPhone: Recent activity and Feeding, side by side.

Android home screen with the Joey control widget: a rail of Feeding, Nappy, Sleep and Pump tiles showing when each last happened, and Left, Right and Bottle buttons — Android: the control widget, with when everything last happened.

Privacy, structurally

We store it. We can't read it.

Every entry is encrypted on your phone with AES-256-GCM before it syncs. The encryption key is generated on the first parent's phone and never sent to the server. It only travels sealed to a phone you approve in person. What the server stores is ciphertext: encrypted blobs it cannot open.

This doesn't rely on a privacy policy that could change later. The server never has the key, so we couldn't read your data even if someone forced us to.

Joey home screen in dark mode — Dark mode, for the 3am feeds.

"A deliberately dumb, end-to-end-encrypted sync log."
How the server describes itself in its own source code. It can't tell a nappy from a milestone.

What the server can see

that a family exists, and when it was created
a hash of the family's access token
random row IDs and timestamps on encrypted rows
blob sizes and connecting IP addresses, like any web server

What it can never see

your baby's name
any feed, sleep, nappy, medication or note
times, sides, volumes, temperatures
who anyone in the family is (Joey never asks for names or emails)

We show you what the server can see as well, so you can judge the rest for yourself.

No accounts, anywhere

Nobody signs up for anything. A new phone joins by showing a QR code to a parent, who scans and approves it in person. Grandparents don't want another password, and a family app has no need to keep a list of its users, so Joey doesn't have one.

Removing a phone actually removes it

When you remove a phone from the family, the encryption key and the server token both change. After that, the removed phone can't read or add anything. Every entry is also signed by the phone that wrote it, and Joey throws away any entry that fails the check.

If you lose every phone

There's no "forgot password", because the server can't reset a key it never had. When you set up, Joey makes a recovery document for you to print. Keep it somewhere safe. It's the way back in if every phone in the family is lost.

Who's behind it

Built the way we build for hospitals.

ISO/IEC
27001:2022
certified

Joey is developed by MedApps Pty Ltd, an Australian health-technology company whose software runs inside hospitals, where information security is independently audited. MedApps is certified to ISO/IEC 27001:2022, the international standard for information security management systems, for the design, development, operation and support of its Med App platform (certificate AMER36931).

Joey is much smaller than a hospital platform, but the same team builds it with the same care. We collect as little as we can, and we designed Joey so your privacy doesn't depend on trusting us.

$0 Free while we get it right. There are no ads, and the growth charts will never be paywalled. If we ever charge for something, families already using Joey will hear about it from us first.

A note on numbers: we do keep our own usage counts, on our own server. We count how many families and phones there are and which days each phone synced. Each count is tied to a random device ID rather than a person, and kept for six months. That is all of Joey's analytics. Nothing goes to Google, Firebase Analytics or anyone else, and the app has no advertising or tracking code.