What details must an invitation never leave out?
Name the person or occasion, give the date with both a start and an end time, state the venue and its full address with a line about arrival or parking, note the dress expectation, and set a reply-by date. A page carrying all of those lets a guest decide whether to come and then actually reach you, without sending a message to check.
Do I need design software or a separate RSVP tool?
No. The invitation and its replies are made in the same place. You write the details, pick a ready design, and switch on the reply button, so there is nothing to export from one tool and wire into another. The guest list updates itself as confirmations arrive.
Can guests see my invitation while I am still writing it?
Not until you publish. A saved draft stays private to you, so you can draft this evening, revise the wording, and correct a time without anyone opening a half-finished invitation. What you share is exactly what you chose to make live.
How do I word a reply line so guests actually answer?
Keep it short and tell them what the button does: ask them to tap to confirm, add anyone they are bringing, and leave a note about food if needed. A clear reply-by date helps too. The samples on this page are safe phrasings to adapt rather than start cold.
Can I really build this myself in one evening?
Yes, because the heavy lifting is knowing the event, which you already do. Writing the details, choosing a look and attaching the reply are each a couple of minutes, and you can start from a draft that Jitabi or the app builds for you. By the end of the night you have a live invitation that answers back.