Declining is just another RSVP. No explanation required. Hosts see who's coming and who isn't.
The flow
Open the event
From the bell notification, the event link, or your notifications.
Tap Can't make it
That's it. The host's notification just says you replied; it doesn't shout the response.
PopIn deliberately doesn't show a "reason" field on the decline. Hosts don't see explanations, so you don't have to overshare. Friendships are stronger than one missed Saturday.
If you want to add a note
Tap Add a message after declining. The host sees it on the guest list. A short "wish I could, next time!" is more than enough.
Maybe is the polite no
Most experienced hosts read Maybe as "probably not". If you genuinely don't know, picking Maybe is fine. If you know you're not coming, decline cleanly - Maybes close to the event usually convert to declines anyway.
If you change your mind later
You can flip back to Going right up until the event ends. The host gets a notification. For close events, a quick "actually I CAN make it!" message is appreciated, especially if they're sorting headcount for food or seating. See Changing your RSVP.
When to bother with a message
| Event type | Personal note expected? |
|---|---|
| Close friend's dinner / small gathering | Yes - a quick "wish I could, out of town that weekend" is a nice touch |
| Mid-size party (10-20) | Up to you - the host appreciates it but won't notice if you don't |
| Larger event (20+) | No - casual decline is fine, the host won't single you out |
| Public event | No - declines don't even register at scale |