Tandem
The shared reminder app that knows.
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01 · Cold open
Splash & first impression
Indigo→blue gradient, bidirectional arrow mark, IBM Plex wordmark.
9:41
— Step 1 of 2
Invite your partner

Tandem only works when both phones are listening. Send your partner this link.

Scan or tap
tandem.app/j/4kp-91q
Share invite link
Skip for now
02 · Pairing
Invite your partner
QR + share link. Skip is permitted — solo mode works until paired.
9:41
— Tuesday, May 27
Today
G A
✓
Feed Maggie
7:02 AM · ALEX
Take morning meds
TIME 8:00 AM
Bring patio cushions in
WEATHER rain ≥ 40% / 6h
Trash & recycling to curb
RECURRING 1st & 3rd Tue · 8 PM
Move laundry → dryer
CHAIN after "Start laundry"
+
03 · Today view
Today's reminders
Shared list. Alex already fed Maggie at 7:02 — Gabriel doesn't see a ping.
9:41
← Cancel — New rule
Tell me what to remind.

In plain English. I'll parse it.

Remind us to bring the patio furniture in if there's a 40% chance of rain in the next 6 hours.
🎙
Parse →
— Try one of these
water plants every 10 days last business day → close books
04 · Natural-language entry
Describe the rule
Plain-English in, structured rule out. Mic for hands-free; chips for inspiration.
9:41
— Confirm
Here's what I heard.

Bring patio furniture in

Trigger
WEATHER   precip ≥ 40%, next 6h
Where
Home — 1450 Pearl St
Audience
Whoever's at home first
Escalate
Both, after 15m unacked
Cooldown
6h after fires
Looks right — save
Edit details
05 · Parser confirmation
Confirm the parsed rule
Haiku turns prose into a structured rule. Always shown before save — no surprises.
9:41
— Household · 12 rules
All rules
⌕
AllTimeLocationWeatherChain
Feed Maggie
TIME 7am & 6pm · both
Morning meds
TIME 8am · me · escalate
Patio furniture
WEATHER rain ≥ 40% / 6h
Dry cleaning
LOCATION leaving work · weekdays
Move to dryer
CHAIN +45m after laundry
06 · Library
The household rule library
By month three this is the moat. Twelve rules carrying the household's daily ops.
6:00
6:00
Tuesday, May 27
⇄ TANDEM now
⏰ Feed Maggie
Both of you can do this. Whoever's home first.
Done Snooze 10m
07 · The ping
Dinner-time ping
6:00 PM. Both phones light up. "Both of you can do this" sets the audience expectation.
6:01
6:01
Tuesday, May 27
✓ Alex marked done — withdrawn from your lock screen
⇄ TANDEM 1m ago
⏰ Feed Maggie
Alex handled it. Nothing for you to do.
08 · The wedge moment
"Alex already fed Maggie."
Sixty seconds later, partner marks done. The notification fades and gets withdrawn cross-device.
3:42
3:42
Tuesday, May 27
⇄ TANDEM now
🌧 Rain in ~2 hours — 78%
Bring the patio cushions in. You're at home; Alex is at work.
On it Skip
⛓ TANDEM · CHAIN queued
After cushions → close umbrella + chair
09 · Weather trigger
Tandem sees the rain coming
WeatherKit fires the rule 2h ahead. Routed to you because Alex's phone is outside the home geofence.
9:41
— This week · May 21–27
Receipts

Who did what. No vibes, just counts.

GGabriel · 23
AAlex · 19
Feed Maggie 8 · 6
Water plants 2 · 1
Trash & recycling 0 · 1
Patio (weather) 1 · 0
Laundry chain 3 · 2
10 · The receipts
Mental-load history
Side-by-side counts over 7 days. The "load-bearing partner" stops being invisible.