Project

Zync — Day Counter

Our own iOS app that counts days and works out what a habit you quit leaves in your pocket.

iOS AppSwiftUIOur Own ProductWidgetsSubscription

Type: iOS app — our own product
Platform: iOS 17.6 and later
Year: 2026
Scope: Design · Development · Widgets · Subscription
Status: In TestFlight, preparing for the App Store

App page

counting directions

Countdown to a date, count-up from a date

widget surfaces

Home screen small, medium, and lock screen

servers

Data stays on the device and in the user's iCloud

Starting point

There are plenty of day-counting apps. What sets Zync apart is that it also shows what the counting earns you: turn the day you quit smoking or cancelled a subscription into a counter, and it calculates the money that stays in your pocket for every day you keep the habit. We wanted it to feel light and familiar, in iOS's own design language.

How we did it

Direction follows the date
Give it a future date and it counts down; give it a past date and it counts up, with a year, month and day breakdown. The user is never asked to pick a direction.
Savings tracking
Assign a daily amount to a counter and the money saved is calculated for every passing day. The currency can be chosen per counter.
Everywhere on the phone
Home screen and lock screen widgets plus per-counter reminders mean counters are visible without opening the app. The app and the widgets share one data store.
Privacy by default
There is no server; data lives only on the device and in the user's own iCloud account. Premium is offered as a subscription or a one-time purchase.

What we delivered

Counters

Countdown and count-up, yearly repeat, pinning, categories, notes, theme colour and icon.

Savings tracker

Money accumulated from a daily amount, with a per-counter currency.

Widgets

Home screen (small, medium) and lock screen widgets.

Reminders

Notification time per counter.

Premium

Subscription and one-time purchase, with an in-app premium flow.

Technology we used

SwiftUISwiftDataWidgetKitStoreKit 2App Group

What the code is written in

Swift100%

8,132 lines of source code, counted in the project repository on 15 October 2026.

App Screens

Day counting, savings tracking and the premium screen. The interface follows iOS's own design language: large titles, system typography, familiar gestures.