Guest notifications
The party doesn't stop for an announcement. Send a gentle push to every guest who opted in — “speeches in five minutes”, a surprise new challenge, or a note afterwards that the gallery is ready to download. Send it now, or schedule it for exactly the right moment.
What you get
Why hosts love it
Now or scheduled
Fire a message instantly, or line it up to send at the perfect time — Koestr delivers it for you.
New challenges, announced
Launch a timed challenge and everyone gets a nudge to open their deck.
After the party too
Let guests know when the album is ready, or share a link — long after the last dance.
More to explore
All featuresLive wall
A big-screen mosaic that fills with your guests' moments in real time — on any TV, projector or laptop.
Photo & video challenges
A gamified deck of prompts keeps everyone shooting the good stuff, with points and a friendly leaderboard.
Points & leaderboard
Points, streaks and a live leaderboard turn capturing moments into friendly competition.
Your next event deserves a wall full of moments
Set up your event in two minutes and see for yourself. It's free to start.