Twinly: Twin Baby Tracker
One shared log for two babies
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Both babies on every screen, and both parents in the same log. Every entry shows who wrote it. Free, no ads, no subscription. Your data is stored in the EU.
Two babies. One log. Both of you.
Twinly is built for parents of twins. Everything assumes two from the start, so you are never doubling up entries or trying to remember which baby you fed last.
It starts before they arrive and keeps up as they grow.
WHAT YOU TRACK
Bottles in millilitres, breastfeeds with the side and how long, and pumping
Nappies, wet and dirty
Sleep, with a timer you start and stop
Growth, plotted against WHO reference curves
Potty training, once they get that far
Milestones, vaccines, medications and appointments
ONE HOUSEHOLD, ON WHATEVER PHONES YOU HAVE
Invite whoever else is doing the nights, with a code. You both see the same records, updating as they happen, and every entry shows who logged it, so nobody has to ask whether the 4am feed got written down.
You each get your own account, so there is no shared password, and either of you can be removed later without touching the other. And because Twinly runs in any browser as well as on iPhone, it does not matter what phone each of you carries.
BUILT FOR THE MIDDLE OF THE NIGHT
Slide across a tile to set the amount and tap to log it, with buttons you can hit without looking. A dark mode that will not blind you at 3am. And it works with no signal: log a feed in a lift or a hospital corridor and it is held on your phone until you are back online, then sent.
IT MOVES WITH THEIR AGE
What you see changes as they grow. Feeding steps back once it no longer applies. Potty tracking appears when it becomes useful. You are not scrolling past screens meant for a different stage.
FROM PREGNANCY ONWARDS
Expecting twins? Twinly starts before they arrive, with a hospital bag checklist, a gear and budget planner priced for two, a shared gift list, and a contraction timer if you need it. When they are born, the app moves on with you.
FOR APPOINTMENTS
Export a clean summary of feeds, growth and health records to bring to your GP, public health nurse or paediatrician.
YOUR DATA IS YOURS
It is stored in the EU, it is not shared with anyone else, and it is never used to advertise to you. Export all of it as a file whenever you like, or delete your account and everything in it from inside the app.
Twinly keeps the record you choose to write. It is not a medical device and it gives no medical advice. Always follow your GP, public health nurse, pharmacist or maternity team.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Reminders on iPhone, and Siri.
- Notifications: a nudge when a twin hasn't had a feed logged for as long as you choose, when a sleep timer may have been left running, and the day before an appointment. Turn them on in More, Notifications.
- Siri: say "Log a bottle in Twinly" and Siri checks the amounts, then logs both twins. Siri can also log wet and dirty nappies and start the sleep timers.
- After logging for one twin, log the same for the other with one tap.
- Home shows what the rest of your household logged since you last looked.
- Note down questions to ask at an appointment.
- The slide tiles fill in each twin's colour, and each entry on the timeline shows that it opens.
- Fixed: entries logged while the app was in the background now appear straight away.
- Fixed: date and time fields no longer run past the edge of the card.
The developer, STEPHEN PATRICK OKEEFFE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- User Content
- Identifiers
- Sensitive Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- STEPHEN PATRICK OKEEFFE
- Size
- 3.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Stephen O'Keeffe
