The whole
room, on one
question.
Hundreds of phones answering the same question at the same millisecond — sub-100ms sync, one glowing big screen, scores that flip live.
No card · Free to 10 players · Live in 60s
Which protocol keeps every phone in sync?
Three screens,
one heartbeat.
The host drives, the big screen broadcasts, every phone answers — all locked to the same clock.
Build the quiz
Design rounds in the host studio — multiple choice, images, timers, speed and streak bonuses, negative marking. Pick a mode and you’re ready.
Put it on the big screen
Open the big-screen view on the projector. Questions, live answer distribution, and the leaderboard for the whole room to see.
Which protocol powers real-time sync in CTX Quiz?
Everyone joins & plays
Players scan a QR or type the join code. Answers stream in under 100ms; scores flip the instant the timer ends.
Join the quiz
Enter the code on the big screen
quiz.ctx.works
Which protocol powers real-time sync?
Pick the format the room deserves.
Regular
Everyone to the end
Classic scoring with speed and streak bonuses. The crowd-pleaser for any audience.
Elimination
Lowest drop each round
Tension rises round by round until one champion stands on the big screen.
Fastest-Finger
Speed decides
Correct and quickest takes it. Millisecond timing makes every tap count.
Engineered for the pressure of a live crowd.
Sub-100ms
A shared server clock keeps every device on the same question and timer, frame for frame.
Smart scoring
Base points plus speed bonus, streak multipliers, partial credit and optional negative marking.
Anti-cheat built in
Tab-focus monitoring, copy prevention, profanity-filtered nicknames and answer confidentiality.
Teams & orgs
Invite members, assign roles, keep every org’s quizzes and data fully isolated.
Built to scale
500+ concurrent players on modest hardware, with reconnection and session recovery.
Live analytics
Per-question distributions, exportable results, and a full audit log of every event.
“The real-time leaderboard had 400 attendees on the edge of their seats. It transformed our annual conference.”
“Elimination mode is a student favourite — classroom participation went up 3×. We run it every week.”
“Setup took five minutes and the big-screen display looked incredible on stage.”
Pay for the seats you fill.
Start free, upgrade when the room grows. No hidden fees.
Free
- →3 sessions / month
- →All core modes
- →Live leaderboard
- →Community support
Pro
- →Unlimited sessions
- →All quiz modes
- →Basic branding
- →Email support
Enterprise
- →Unlimited sessions
- →Custom branding
- →Priority support
- →Dedicated manager
Start the show.
Build a quiz, share the code, watch the room light up. Free to start — live in a minute.