Five things about using this on the device you actually use it on.
Today is the first card. The goal card carries your title, the stepper, how long you have been in this phase, the phase hint and the bar — and it sat above the day's task, so on a phone "Declare it" was off the bottom of the screen. On the pane called Today, in a product that asks for two minutes a day. The two minutes are now the first thing you see, and nothing about them needs scrolling to. On a laptop nothing moved: both columns are on screen together there.
The controls are thumb-sized. "sign out" was the only thing on this screen big enough to be sure of hitting, and it got there because the cost of missing it is your whole session. Everything the daily loop actually runs on was smaller — "Declare it", "Submit proof", "Request phase advance", "Commit", and "reword" at sixteen pixels tall. The prices are different but they are all real: a miss on "Declare it" is the morning, a miss on "Submit proof" at eleven at night is the evening, and a miss on "reword" swaps your goal for an edit box, which reads as the app having eaten it. All of them now clear the same 44px, and none of them moved or grew wider to get there.
A finished phase looks like something you can open. Tapping IDEA or VALIDATION on the stepper shows you every day you spent in it. On a phone nothing said so — the pointer, the hover highlight and the tooltip that announce it are all things only a mouse has, so the two chips you can open looked exactly like the three you cannot. Completed phases now carry a small chevron, on any screen without a mouse.
The goal box keeps its own example. "e.g. Tiffin-delivery app for my college" was being cut off mid-word on a phone, and the half that went missing is the half that tells you how big the answer should be — one campus, not a market. On a narrow screen the box and "Commit" now stack instead of sharing a row, so the example arrives whole and "Commit" gets the full width.
One less line in the way of the conversation. The caption under "Coach me / Think with me" named whichever of the two was already lit. On a phone that is a seventh of the visible conversation spent saying something the lit button already says, so on the narrowest screens it is gone. The switch is its own label, and what the other mode is for is in the tour, where there is room to say it properly. The note under the box stays exactly where it is: it is the only place that tells you the box you type in is not the box that counts.