Event & party organizers
Give every guest a glowing role in the night.
Live, synced light show — from any laptop
Your crowd is the light show
Free and open source. No wristbands to buy, no app to install — the lights are already in the crowd's hands. They scan a QR; you drive the whole room by hand or from your VJ rig, in time with the music.
Who it's for
Built for anyone who fills a room
From an intimate first dance to a packed stadium — if you have a crowd and a song, you have a light show.
Concert & festival promoters
Turn the whole field into your stage lighting.
Clubs & DJs
Drop the beat and the whole floor flashes with it.
Wedding & celebration planners
A shimmer of light wrapped around the first dance.
Corporate events & conferences
Light the room in your brand colors on cue.
Sports arenas & stadiums
Erupt the stands in color on every goal.
Churches & worship events
Unite the congregation in one moving moment.
Schools, universities & proms
The whole hall lights up for the big night.
Why it works
Stadium-grade moments, zero hardware
No wristbands to buy, ship, charge or collect. The lights are already in the crowd's hands.
Unforgettable shared moment
One synchronized wave of light the whole crowd creates together — the kind of moment people film and remember.
Zero hardware
No wristbands or LEDs to buy. It uses the phones people are already holding.
No app install
Guests just scan a QR and join in their browser. Nothing to download, nothing to sign up for.
Works on any phone
Screen light works everywhere; on Android the real flashlight fires too — for an extra-bright wave.
Synced to your playlist
Build the show around your music. Every flash lands exactly on the beat, in perfect sync.
Set up in minutes
Run the whole thing from a laptop. Build the playlist, project the QR, press GO.
Safe by design
Flash-rate limited with a photosensitivity warning and consent, so the show stays fun for everyone.
The control room
You drive it. The crowd is the light.
One laptop or tablet runs the whole show — from a single “GO” to VJ-grade live control, all in the browser.
The VJ pult — play the crowd by hand
Grab saturation, colour, brightness and flash and ride them under the music — like a VJ console, right in the browser. Open it fullscreen and mix with your fingers on a tablet.
- Four touch layouts: faders, colour wheel, XY pad, big momentary pads
- Intervene in a running preset, or go fully manual
- Map a USB MIDI controller with WebMIDI
Presets, flash & big moments
Upload a track and the lights follow the music. Layer a separate camera-flash channel, fire one-tap synchronized fireworks, scroll a message across every phone, or hit BLACKOUT — the music keeps playing.
- Pulse · Colour Waves · Rainbow Chase · Ocean, plus a wave that reads across the crowd
- Five one-tap firework bursts, then the show resumes
- Scrolling marquee, global mute, seek, blackout
Lock it to your colours
Restrict the whole crowd to a flag’s or a brand’s palette — pick colours on the wheel and everything snaps to the nearest one. Perfect for a product launch, a club night, or a team’s colours.
- One-tap flag & brand palettes, or build your own on the wheel
- Works with the presets or under full manual control
Plug into your VJ rig
Already run Resolume, TouchOSC or Bitfocus Companion? Drive the crowd’s phones from the console you already use, over OSC — a tiny bridge runs on your own laptop, no cloud lock-in.
- OSC address map for presets, colour, flash, fireworks and blackout
- Optional WebMIDI for a hardware fader/pad box
Use cases
Picture the moment
A few ways people turn a crowd's phones into something unforgettable.
500 phones flash gold on the beat
The chorus hits, you press GO, and in an instant five hundred phones flash gold in perfect unison — a single golden pulse rolling across the whole crowd, right on the downbeat.
A first-dance shimmer
As the couple steps onto the floor, every guest's phone breathes a soft warm shimmer around them — a glow that wraps the room without a single spotlight rig.
A countdown finale
Three… two… one — the whole venue strobes brighter with every number, then explodes into a full-color burst as the clock hits zero.
A goal celebration
The ball hits the net and the stands ignite — thousands of phones flashing your team's colors in a wave that circles the whole arena.
A brand-color moment
At the reveal, the entire room turns your exact brand color on cue — a launch image that lands in every attendee's camera roll.
How it works
Three steps to a synced crowd
No rigging, no installs, no rehearsal. From laptop to lit-up room in minutes.
Upload & project
You upload your playlist on a laptop and project a QR code on screen — or print it on the tickets.
The crowd scans & joins
People point their phone camera at the QR and join in seconds — straight in the browser, no app needed.
You press GO
Hit GO and every phone flashes to the music, perfectly in sync — one light show across the whole room.
Pricing
Free to run yourself. Done-for-you if you'd rather not.
The app is free and open-source (Apache-2.0) — self-host it with no limits, or try the hosted demo. The paid tiers are an optional managed service: we plan, set up, operate and tune your show on the night. Final scope is confirmed on a quick call.
Start here
Free
self-host or demo
€0forever
Run the full app yourself with no limits — Docker, open source. Or try the hosted demo here. No per-person fee, no wristbands, no app for your crowd.
Try it free →Spark
up to 100 phones
from€1 900
Parties, weddings, small venues — one operator, on good Wi-Fi.
Discuss my eventSurge
up to 1,000 phones
from€9 900
Clubs, mid-size concerts, conferences — soundcheck + on-site operation.
Discuss my eventStadium
up to 10,000 phones
from€50 000
Large events — subject to infrastructure provisioning for the crowd size.
Discuss my eventBeyond
Need more?
Let’s talk
Bigger or bespoke? Let’s talk it through and scope it to your event.
Discuss my eventPrices are starting points and depend on venue, audience size and network conditions — confirmed on a consult call. No payment here; every tier starts with a conversation.
See it yourself in 10 seconds
Open the live demo, scan the QR with your phone, and watch your own screen join the show. Grab a few phones for the full effect.
Open the live demo →Seen in the wild
Crowds already light up with their phones
It's a real moment people create — a wave of phone light across a stadium or a concert. Crowd Light Show turns it into a show you actually control: one operator drives every colour, flash and effect live, and the music plays in sync on every phone.
Interested? Let’s talk about your event
Tell us a little about your event and we’ll get you set up — or get you a quote for managed work.
Thank you! 🎉
Got it — we’ll get back to you within one business day. Talk soon!
While you’re here — show your friends
Open the live demo together: it’s a synced light show you can share. Send this link and watch your phones light up as one.