Pulse is a fictional budgeting app I built as a working prototype you can use in the browser: six screens, a deck of budget cards you flick through and tap open, swipe to archive with undo, a sheet that follows your finger, numbers that roll instead of swapping. Pull down on Home and a new purchase lands in the list, flip a bill to set aside and Safe to spend updates on the other screen, hold the reset button for a second and everything goes back where it started. Light and dark, a phone frame on desktop, full screen on a phone, and a design notes panel that says why each interaction moves the way it does.