BirthTandem

For iPhone · Free to download

A calm contraction timer for both of you.

Start and stop from your Lock Screen, without unlocking. BirthTandem keeps count, watches the rule your provider gave you, and tells you gently when it's met.

Coming soon to the App Store

No adsNo subscriptionFree to edit

Contracting

2:03

Last · 4 min 50 s apart · 62 s long

5·1·1
The Live Activity on your Lock Screen. Go on, tap it, and watch the tide below.

Contractions come at 3 a.m., in the dark, with one hand held. Nobody should be unlocking a phone or doing sums between them. BirthTandem does the counting, so the two of you can just be there.

Two hands holding on a rumpled bed at night. A lamp glows on the bedside table, next to a phone.

01No unlocking

Your phone stays locked. The timer still works.

In the middle of a contraction, nobody wants to type a passcode. Tap Start and Stop wherever your phone already is. Every one of these writes to the same timer.

  1. 1Lock Screen

    Start and stop without unlocking.

    A big Stop button, the time so far, and your last interval and length. No passcode, no app to find.

    An iPhone Lock Screen with BirthTandem's Live Activity: Contracting, 2:03, last 4 min 50 s apart and 62 s long, the 5-1-1 marks, and a Stop contraction button

  2. 2Dynamic Island

    The count stays up top.

    Reply to a message or look something up: the clock keeps running in the Dynamic Island. Press and hold it for the Stop button.

  3. 3Control Center, Action Button, Siri

    Or don't look at all.

    Add the Contraction toggle to Control Center, on iOS 18 and later. Set the Action Button to Time a contraction: press and hold to start, and again to stop. Or say Start contraction in BirthTandem.

  4. 4The app

    One big button.

    BirthTandem opens straight onto it, with nothing in the way. Under it, the Tideline draws the last two hours, so the pattern shows at a glance.

    BirthTandem's Timer: Contracting, 0:46, a large Stop button, the rule card reading Getting closer with 5 and 1 lit, and the Tideline of the last two hours

  5. 5Mistakes happen

    A wrong tap takes one tap to fix.

    Every tap gets five seconds of Undo. Change a start or end time, delete one, or add one you forgot to time. All of it free, and never behind a paywall.

    The Edit contraction sheet over the list of contractions: started 10:19, ended 10:20, lasted 62 s, with Delete and Save

02Your provider's rule

Know when it's time to call.

Enter the rule your provider gave you: 5-1-1, 4-1-1, 3-1-1 or your own numbers. Each number lights up while it holds. When all three do, you get one gentle alert.

A night, in twenty seconds

3:12 AM

BirthTandemnow

Your 5-1-1 rule is metTime to call your provider.

5
4 min 50 s apart on average
1
65 s long on average
1
12 in the last hour

Rule met

BirthTandem won't tell you what to do. It tells you when the rule your provider gave you is met, so you can call them.

Recorded in the app

The same night, in the real app.

One Start, and a Stop a minute later. The alert arrives, and a tap on it opens the summary you'd read out on the phone.

03Ready for the phone call

The last hour, in words you can read out.

When you call, they'll ask how far apart and how long. The summary has the answer, ready to read aloud or paste into a message.

Read this to triage

12 contractions in the last hour, about 4 min 50 s apart, lasting about 65 s. Rule 5-1-1 met at 3:12 AM.

Share it as text, free. Or as a PDF with partner sync.
12
contractions
4 min 50 s
apart on average
65 s
long on average
5·1·1
Met at 3:12 AM

04Both of you

Two phones. One timer.

Invite your partner or doula with a link. Either of you can tap, and every tap shows up on both phones. Nobody has to shout numbers across the room.

$4.99once. No subscription.

  • Partner sync through iCloud. Your partner joins free.
  • A PDF report to share with triage.
  • A keepsake of the day: your whole labor as one Tideline.

Shared with your family through Family Sharing. Everything else in BirthTandem is free.

Your iPhone

Resting

4:12

Your partner's iPhone

Resting

4:12

Tap either one.

05Our promise

Nothing between you and the button.

  • No ads. Ever.Not under the button, not anywhere.
  • No subscription.Free to use, with one optional upgrade you pay for once.
  • No paywall on mistakes.Undo, edit and delete are free, always.
  • Quiet during labor.No upsells or rating requests within three hours of a contraction.
  • No account.Nothing to sign up for. Open it and tap.
  • Yours alone.Your contractions stay on your phone, and in your own iCloud if you share them. We can't see them. How we handle data

Set it up now. Forget it until you need it.

Install it in your third trimester, enter your provider's rule and invite your partner. On the night, it's one tap.

Coming soon to the App Store