logvan Fourth Watch
Fourth Watch app icon: a crescent moon over calm water at dawn

Keep watch, together.

One log for sleep, feeds and diapers, on every iPhone that helps with the night.

Download on theApp Store

Free for iPhone · iOS 17 or later
No account, no ads, no tracking

Insights: 14 hours 32 minutes of sleep a day this week, with night and nap bars
The Today screen during the night: Nora asleep for 1 hour 5 minutes, with buttons for Night waking and Up for the day

Family sharing

Both of you, in sync.

Whoever gives the 3 AM bottle, the other iPhone knows within seconds.

The Log on Alex's iPhone: a 5 oz bottle at the top of today's entries
Alex logs a bottle…
The Today screen on the other iPhone, with a notification: Alex logged a 5 oz bottle, for Nora
…and your iPhone hears about it.
  • No account to make. Invite a partner, a grandparent or a nanny through iCloud, the same way you'd share a note.
  • Everyone logs on their own phone. Same log, same timer, same totals, wherever you are in the house.
  • A quiet heads-up. When someone else logs something, your iPhone lets you know, so nobody double-feeds. Turn it off any time.

Live Activity

Don't even unlock.

The night's timer lives on your Lock Screen and in the Dynamic Island.

Glance at how long this stretch has been, then tap Night waking or Up for the day right there. The phone stays dark and your hands stay free.

Insights

Watch the nights get longer.

The numbers that matter, without a spreadsheet.

Each week is set beside the last, and every change is colour-coded: teal when it's better, warm when it isn't. Days nobody logged are left out, so the averages stay honest.

  1. Insights, Week: 14 hours 32 minutes of sleep per day, up 2 minutes on last week, over a week of night and nap bars, with tiles for night sleep, naps, longest stretch and wake-ups.

    Week

    This week next to last, with the change in every number.

  2. Insights, Month: tiles comparing the last 30 days with the 30 before, and a smooth week-by-week sleep chart.

    Month

    Thirty days at a glance, and week-by-week trends.

  3. Insights, 24 hours: a map of every night sleep, nap and feeding over the last 14 days.

    24 hours

    Every sleep, nap and feed for two weeks, midnight to midnight.

  4. Insights, Milestones: coming up, a first 6 oz bottle and the 500th diaper; achieved, the first 10-hour stretch and the first night with no wake-ups.

    Milestones

    The first ten-hour stretch, noticed the morning it happens.

Growth: 14 pounds 3.5 ounces at the 51st percentile, plotted on WHO bands from birth to 5 months, with percentile badges for each measurement

The Baby tab

Growth on WHO charts.

Weight, length and head size, plotted from birth.

  • Percentiles for every measurement, on the WHO Child Growth Standards
  • First foods and any reactions, once solids begin
  • Vitamin D and medicine reminders (it never suggests doses)
  • A one-page summary to bring to checkups

Made for one hand at 3 AM.

  • Lock Screen timer

    See the current stretch and log a wake-up without unlocking. It's in the Dynamic Island too.

  • Siri and Shortcuts

    “Log a diaper in Fourth Watch.”

  • Logged it late?

    Change the time right after, or edit any entry later.

  • Night mode

    A warm, dim screen that won't wake anyone.

  • Formula supply

    Scan the can, measure by the gram or the bottle, and see when you'll run out.

  • More than one child

    Twins, siblings, and toddlers with meals and first foods.

  • Ounces or millilitres

    Whichever your bottles say.

  • Missed a day?

    It picks up from now, and the gap never skews your averages.

Why the fourth watch?

First watch6–9 PM
Second watch9 PM–midnight
Third watchmidnight–3 AM
Fourth watch3–6 AM
The night, as the Romans divided it.
And in the fourth watch of the night Jesus went unto them, walking on the sea.
Matthew 14:25 (KJV)

The night used to be counted in watches. The fourth ran from about 3 to 6 in the morning: the darkest, longest stretch, and the one closest to dawn. It's when the disciples, rowing hard against the wind, heard Be of good cheer; it is I; be not afraid.

Every parent of a newborn knows that hour. This app is for it, and for whoever is up with you.

Your log stays yours.

  • Saved on your iPhone first, and only ever synced to your family's own iCloud.
  • Encrypted end to end, so only your family's devices can read what you log. Not even I can see it.
  • No accounts, ads, analytics or tracking. Nothing is sold or shared.
  • One outside lookup: when you scan a formula can, only its barcode number is sent to Open Food Facts to find the product name.

Read the privacy policy

Help

Something not working, or an idea? Email [email protected].

How do I invite my partner?

On your iPhone, open Settings → Family & iCloud, turn on iCloud sync, then tap Invite someone and send the link. They install Fourth Watch, open the link on their iPhone and tap Join. You can also start the app with “Join a family” and paste the link.

Can I turn off the notifications from my partner?

Yes. Settings → Family & iCloud has a switch for them on each iPhone.

I forgot to tap “Woke up.”

The Today screen notices a sleep that's been running too long and asks “Still asleep?”, with a one-tap likely wake time. You can also tap Adjust times, or edit any entry from the Log.

Does it work without internet?

Yes. Everything is saved on your iPhone right away and syncs with your family when you're back online.

How do I move to a new iPhone?

With iCloud sync on, install Fourth Watch on the new iPhone, signed in to the same Apple Account, and turn on iCloud sync in Settings → Family & iCloud. Your log comes back.

How do I delete my data?

In Settings, choose “Erase [name]'s log” or “Erase everything and start over.” To remove the iCloud copy, go to the iPhone's Settings → your name → iCloud → Manage Storage → Fourth Watch.

What does it cost?

Nothing. Fourth Watch is free, with no ads and no subscription.

Is this medical advice?

No. Fourth Watch keeps a record. It never suggests doses or diagnoses, and growth percentiles are a conversation starter for your pediatrician.