Zero days left is the one number you can't act on
Last year I bought my mum's birthday flowers at a petrol station. A countdown told me the day had arrived; it never told me when the work had to begin. Kept fixes exactly that.
Last August I bought my mother's birthday flowers at a petrol station, at 8:40 in the evening, next to the windscreen wiper fluid. The countdown app had done its job perfectly: it told me, that morning, that there were zero days left.
Zero is the one number you can no longer act on. Flowers need ordering ten days out. Cards need writing when you still have something to say besides sorry this is late. A countdown that ends at zero is a machine for manufacturing petrol-station gifts.
Kept starts from that exact failure. The pitch, as I'd put it after a month of using it: it's not counting down to the date, it's counting down to when the work has to begin.
A date is a plan wearing a number
Every date in Kept carries a plan — one line, written when you add the date, that says what "ready" means. Mum's birthday is in there now: August 27, eighteen days out as I write, plan: Order flowers and write the card.

The reminders are the part that actually changed my behaviour. They're staged — three weeks out, ten days, three days, one day, the day itself — and each rung does a different job. The three-week one is "start thinking." The ten-day one is "order the thing that ships." The one-day contact is a confirmation, not a panic. A single reminder, whenever it lands, is just an alarm you snooze. A ladder is a plan approaching.
The home screen sorts by what's next and tells you, in nice big letters, the only status that matters: PLAN IN PLACE or PLAN NOT WRITTEN. I have discovered I cannot look at "PLAN NOT WRITTEN — 8 DAYS TO GO" for more than about two viewings before I cave and write the plan. This is the most productive shame I've ever paid $4.99 for.

The part that accumulates
When a date passes, Kept asks how it went and marks it: prepared, scrambled, missed, or moved — ten seconds of undo, then it settles permanently. Recurring dates spawn their successor automatically, so Mum's birthday 2027 already exists and already knows what the plan was this year.
That permanent record is quietly the best feature. My last twelve months, per Kept: nine prepared, two scrambled, one moved. The petrol station incident predates the app, so it escaped the record, which is honestly for the best. But next August, when the three-week rung lands, I'll be able to see exactly how this went every year before — the countdown and the history are one object, on one screen.
A countdown app remembers nothing. A calendar remembers everything and tells you none of it. Kept keeps the score you actually care about: did the people I love get the prepared version of me, or the scrambled one?
Details, briefly
On your phone, synced through your iCloud, no account. It's sitting in App Review as I post — days away, hopefully. $4.99 once, or $9.99 for the all-mini-apps bundle. No subscription.
The flowers are ordered on Thursday. The card, I'm told by a reminder scheduled for the 17th, is my problem then and not before.
Plan the first move before the date arrives.