TandemBaby Tracker

Every feed, nap and first remembered. Calm to log, beautiful to look back on. A baby diary built for the moments, not the data. Twins? Pro is yours, free.

Every feed, nap and first remembered. Calm to log, beautiful to look back on. Built for the moments, not the data.

TandemBaby is a calm, private baby diary for the first 1000 days. Log feeds, sleep, diapers, and milestones in seconds. Come back when the moments matter.

Free for the basics. Pro for the patterns and the keepsake.

THE ORBIT A 24-hour ring on your home screen showing your baby's whole day at once. Naps, feeds, diapers, awake stretches, all on one face. No timelines to scroll. No charts to interpret. Once you see it, lists feel obsolete.

PARTNER SYNC Parenting in rhythm. Real-time sync between two caregivers. Sign in with Apple, share a 6-character code, paired in 30 seconds. When your partner logs a feed, you see it in seconds. Works offline, syncs when reconnected.

APPLE WATCH Log feeds, sleep, and diapers from your wrist. Active timers shown on the watch face.

WIDGETS Wake window, last feed, and sleep timer right on your Lock Screen and Home Screen. Glance, don't unlock.

WHISPER MODE A dark interface that auto-activates between 10pm and 6am. Logs in one tap. The screen stays dim. Your partner can sleep.

ONE TAP. TWO TAPS. DONE.

• Tap Sleep once to start. Tap Wake to end.
• Tap Repeat to log a copy of your last feed. Side auto-alternates.
• Tap Feed, pick a side, the timer starts.
• Live Activities and Dynamic Island show active timers without opening the app.

WHAT YOU CAN TRACK

• Feeds: breastfeeding (left, right, switch sides), bottle, pumping, solids
• Sleep: naps, night sleep, wake windows
• Diapers: wet, dirty, both. Optional poop color reference based on pediatric guidelines.
• Growth: weight, length, head circumference
• Milestones: 65 of them across 8 categories, with photos and notes
• Health: medications, vaccines, temperatures

THIS WEEK Plain-language developmental context based on CDC and WHO guidelines. What is likely happening. What you might notice. What you might try. No fearmongering. No pseudoscience.

WHO GROWTH CHARTS Real percentile tracking against World Health Organization standards. Pediatrician-ready PDF report in three formats: Full Report, Well Visit, or Growth Only.

MEMORY WALL A gallery of milestone photos. Your child's first months as a story you can return to.

PRO MEMBERSHIP Free includes daily logging, the full Orbit, the Apple Watch app, all widgets, partner sync, Whisper Mode, This Week, and a week of stats. Pro unlocks Month and longer stats, milestone photos, WHO percentile charts, the Memory Wall, three PDF report types, and multi-baby support for siblings.

Pro is $6.99 per month or $49.99 per year. 7-day free trial. Cancel anytime in Settings.

Subscriptions auto-renew unless turned off at least 24 hours before the end of the period. Manage in your Apple ID settings.

PRIVACY TandemBaby uses Sign in with Apple only. We do not ask for your email or phone number. We do not sell or share your data. Ever. Zero third-party tracking SDKs. All sync data is hosted in Frankfurt, Germany, on EU infrastructure. Read our Privacy Policy at tandembaby.com/privacy.

This app is for tracking and recordkeeping only. Always consult your pediatrician for medical questions and decisions.

The data fades. The moments stay.

Terms of Use: https://tandembaby.com/terms/