The last ninety days of wedding planning are where the plan breaks. The photographer wants a schedule. The DJ wants a different version of the same schedule. The caterer needs to know when speeches happen, the officiant when to arrive, your parents when photos are. Six stakeholders, one day, no shared clock.
The day-of timeline here is the master copy. Vendors get a read-only link to the same live schedule, the coordinator gets a printed page, and on the day itself the app shows what's happening now and what's next. We know it works because we ran our own wedding on it. Jami kept the day on track from her phone.
One master schedule, many readers.
Phases, then moments
Getting ready, ceremony, cocktail hour, reception, send-off. Each phase holds its events with start times, durations, and notes, and the whole day totals itself.
One link for every vendor
The photographer, the DJ, and the caterer all work off the same schedule via a read-only share link. No accounts, no attachments, no version four of the PDF.
A print view worth handing over
One clean page for the coordinator's clipboard and the officiant's pocket. When the wifi dies, the wedding doesn't.
The ceremony, scripted
Processional, readings, vows, rings, pronouncement: ordered elements with durations, so you know the ceremony runs 22 minutes before anyone rehearses a step.

A coordinator, the venue, your most organized friend: whoever runs your day runs it off one thing, the timeline. Give them a good one.
The method behind it: the day-of timeline, hour by hour.