Tap the card. Catch the receipt.
What this is
Tapstub is a corporate card and spend-management app for the people who actually carry the card. The moment a card is swiped, an authorization push lands on the employee's phone, they snap the receipt in the notification, and the expense codes itself against policy before they've left the counter. Finance and line managers use the same app from the other side: a queue of coded expenses cleared with a single biometric approval that is cryptographically signed on device.
Tapstub is designed twice — once in the iOS idiom and once in Material 3 — rather than one layout wrapped twice for both stores.
| Dimension | iOS | Android |
|---|---|---|
| Specced against | Swift · SwiftUI | Kotlin · Jetpack Compose |
| Design language | The Apple platform idiom | Material 3, redesigned rather than skinned |
| Screens in this set | 2 | 1 |
2 in the iOS idiom and 1 redesigned in Material 3 — the same feature rebuilt, not the same layout skinned. Everything inside the frames is fictional demo data.
The employee's home: card hero with masked PAN and reveal hint, quick actions, the monthly limit at 61% of $3,000, a live "swiped 12 seconds ago" banner for the $18.40 Meridian Coffee Roasters authorization, and the day's transaction feed with per-row coding status and a row held open on its trailing "Not mine — dispute" swipe action.
Opened from the swipe push: the amount hero, the captured receipt with its on-device extraction reconciled against the authorization, the auto-coded category, GL code and cost centre, the policy checks — under a Face ID confirmation sheet clearing three expenses worth $717.00 with a Secure Enclave signature.
The same screen and the same records rebuilt in Android idioms:
M3 top app bar, elevated card at 28dp, a horizontally scrollable assist-chip row, a wavy linear progress indicator, segmented buttons, the same list item held open on its trailing dispute action, an extended FAB for scanning, a navigation bar with a pill active indicator, and an undoable snackbar.
6 capabilities Tapstub is designed around. Each is an operating-system entitlement or a hardware path a browser tab either cannot reach or cannot be trusted to hold.
Design intent, not shipped implementation. Each line describes the target architecture this build is specced against.
Swift and SwiftUI on iOS, Kotlin and Jetpack Compose on Android, with the domain logic written once and consumed by both. A target architecture, not a shipped dependency list.
Tapstub is a design build, so there is nothing to buy on this page. If your team has a problem that needs this kind of depth — offline for a full shift, real sensors, work that has to happen with the screen off — tell us about it and we will tell you honestly whether we are the right people to build it.