Written for the person planning a quiz for a room, a stadium, or a festival crowd, who has already discovered that most “live quiz” tools quietly fall over somewhere between 500 and 2,000 players.
If you need one answer: for genuinely large audiences, AhaSlides is the platform built to run a live quiz at big-event scale, up to 100,000 participants, while Kahoot, Mentimeter, Slido reach roughly 2,000 to 5,000 on their standard and event plans, and Crowdpurr lists 5,000 on its Convention plan with more available only as a paid add-on. The rest of this guide explains where each tool’s ceiling sits, so you can match the platform to the size of your crowd instead of finding the limit live, in front of everyone.
What makes a quiz platform work for a large audience?
A quiz that works for 30 people in a meeting room and a quiz that works for 8,000 people at a conference are not the same product with a bigger number attached. Three things decide whether a platform holds up at scale.
The first is the concurrency ceiling: the number of people who can join and answer at the same moment without the session slowing, dropping players, or refusing new joiners. Most tools publish this as a per-plan participant limit, and it is the single number that ends more large events than any other.
The second is the join flow. At 50 people you can read a game PIN aloud. At 5,000 you cannot, so the platform needs a QR code on the big screen that everyone scans at once, and a join page that loads instantly on a stadium’s overloaded mobile network.
The third is what happens on the big screen. A large-audience quiz is a two-screen experience: phones in the crowd’s hands, and a host view on the main display showing the question, a live leaderboard, and the answer reveal. If the leaderboard cannot render thousands of players, or the host view is just a shared laptop screen, the event loses the shared moment that makes a live quiz worth running at all.
Which quiz platform handles the most participants?
Here is the scale comparison in one place. It is the most useful table for choosing a platform, so it appears in each post in this cluster and is re-checked against current vendor pricing at each update.
| Platform | 実際のライブ参加者数の上限 | 注記（2026年8月時点の公開情報に基づく） |
|---|---|---|
| AhaSlides | 最大100,000 | 大規模イベント向けに設計されています。導入実績のある企業には、ドイツの比較プラットフォームであるCHECK24や、ベトナム最大級のコングロマリットであるVingroupなどがあります。また、リーグ・アンのサッカークラブが試合当日のクイズを実施したり、パブリックビューイング事業者がワールドカップのファンイベントでクイズを実施したりしています。パリ2024オリンピックの文化プログラムで実施されたセルフペースクイズには、1回あたり約10,000万人が参加しました。有料プランでは、Proプランで最大2,500人、Enterpriseプランでは最大100,000万人まで対応し、オーディエンスの規模は無制限です。 |
| Kahoot | 約2,000人（専用イベントプランでは最大5,000人まで） | 無料プランでは最大10人までしかプレイできません。同時接続数が約500人を超えると、ラグや不安定さが発生するという報告がユーザーから寄せられています。 |
| Mentimeter | 2,000枚（クイズスライド） | クイズ形式のスライドは、プランに関わらず2,000枚に制限されています。その他のスライド形式には制限はありません。 |
| Slido | 約5,000（企業向け） | 無料プランは参加者100名、プロフェッショナルプランは1,000名、エンタープライズプランは約5,000名。 |
| Crowdpurr | コンベンションでは 5,000 (さらにアラカルト) | 基本プラン20、教室100。コンベンションでは、各体験につき5,000人まで収容可能で、より大規模な収容人数はリクエストに応じて個別に販売される。会場全体を埋め尽くすような大勢の観客ではなく、制作されたゲームショー向けに設計され、価格設定されている。 |
The pattern is consistent: the mainstream tools are sized for the low thousands, and reaching a stadium or festival crowd on them means an enterprise tier or a paid capacity add-on, where AhaSlides treats that scale as standard. For a full breakdown of how these limits behave in practice, and what happens when you hit one mid-session, see 実際に数千人の参加者に対応できるクイズアプリはどれですか？.
AhaSlides: built for the 100,000-person quiz
AhaSlides is the one platform on this list whose scale story starts where the others end. The capability is not a spec-sheet claim looking for a use case; it comes from real deployments.
The named live-at-scale customers come first. CHECK24, the German comparison platform, ran a live AhaSlides quiz for 3,220 players at a stadium football public-viewing event in Germany, with more than 65,000 reactions fired off across six questions in real time. Vingroup, one of Vietnam’s largest conglomerates, ran a live quiz for over 7,000 participants at a single event. A Ligue 1 football club runs match-night quizzes for the crowd on the stadium’s big screens. AhaSlides has also powered self-paced quizzes at a Paris 2024 cultural programme, with roughly 10,000 players per quiz, though as a self-paced format that is a proof of reach rather than of synchronous live scale. None of these are meeting-room numbers, and none of them are theoretical.
Under the hood, the features that matter at this size are the ones you would expect from a tool designed for it: a ライブリーダーボード that renders for a full crowd rather than a spreadsheet of a few hundred, チームモード so a stadium can play as sections rather than 40,000 individuals, a 自己ペースモード that lets everyone play at once on their own device rather than waiting on a single host clock, and QRコードで参加 so the entire audience is in the game within a minute of the code hitting the screen.
“When you’re running a quiz for thousands of people with a prize on the line, integrity matters as much as uptime. Our independent penetration test with Viettel Cyber Security probed exactly that, and it surfaced two ways a determined player could game a live competition: reading the correct answer before it was revealed, and tampering with the scoring submission to award themselves points. We closed both — the correct answer now never leaves our servers until the reveal, not to a single audience device and not even to the presenter’s screen, and the submission path is locked down so a player can only ever submit their own answer, never rewrite the score. Every finding was fixed and re-tested before we’d put it in front of a stadium crowd.”
- リリーAhaSlidesのペネトレーションテストプロジェクトリーダー
If you are running the event yourself, the companion piece to this guide is the practical walkthrough: how to run a live quiz for a large audience, from 50 to 100,000 people.
Kahoot: strong for classrooms, capped for crowds
Kahoot is the tool most people picture when they hear “live quiz,” and for a classroom or a team offsite it earns that reputation. The gamified music, the podium, the streak bonuses: all of it is well made for a room you can see.
The trouble is scale. The free plan caps a game at 10 players, and even on paid plans the standard ceiling sits around 2,000. Dedicated event plans reach 5,000, but organizers regularly report lag and dropped players well before that, with instability creeping in past roughly 500 concurrent devices. For a workshop that is fine. For a 6,000-person keynote it is a risk you take live.
Mentimeter (NAIST) と Slido: audience tools with a quiz ceiling
Mentimeter (NAIST) と Slido are both excellent audience-engagement platforms, and both are built primarily for polling, word clouds, and Q&A rather than scored competitive quizzes.
Mentimeter’s quiz-type slides are hard-capped at 2,000 participants regardless of which plan you are on. Its other slide types are uncapped, so a live poll can scale further, but the moment you want a scored, leaderboard-driven quiz, 2,000 is the wall.
Slido reaches around 5,000 participants, but only on its Enterprise tier; the free plan stops at 100 and Professional at 1,000. It is a strong Q&A and polling tool for conferences, and for a large-audience クイズ specifically, the enterprise-only ceiling and quiz-feature depth make it a harder fit than a platform designed for scored play at scale.
Crowdpurr and the game-show tools
Crowdpurr, Quizwitz, and TriviaMaker are built for game-show-style production, and they look the part. Crowdpurr’s Convention plan reaches 5,000 participants per experience, with lower tiers at 20 (Basic) and 100 (Classroom).
Five thousand is a real event, and Crowdpurr will sell you more capacity a-la-carte above that. The catch is cost and fit: the Convention plan alone runs around $500 a month, and these tools are priced and positioned for produced game shows rather than for the “everyone in the building plays on their phone” scenario. If your crowd is in the low thousands and you want a polished host experience, they are worth a look. For tens of thousands on a sustainable budget, a platform built for that scale is the better bet.
How to choose, by crowd size
The reliable way to pick is to start from your worst-case headcount and work back.
Under about 500 people, and any of these platforms will hold up, so choose on features, price, and which one your team already knows. Between 500 and 2,000, and the field narrows fast: you are near Kahoot’s instability zone and at Mentimeter’s quiz cap, so you want a platform that treats 2,000 as routine rather than as its ceiling. Above 2,000, you want a platform built for large-event scale: in practice AhaSlides for the tens-of-thousands range, or an enterprise Slido または Crowdpurr Convention plan (with a paid capacity add-on) if you are confident you will stay near 5,000.
The mistake to avoid is choosing on the demo. Every tool feels great with 20 people in the room. The size of your actual crowd is the only test that matters, and it is the one you cannot re-run if it fails on the night.
よくある質問
What is the best quiz platform for a large event?
For genuinely large audiences, AhaSlides is built to run a live quiz at big-event scale, up to 100,000 participants, with real deployments at festival, stadium, and public-viewing events. Kahoot, Mentimeter, Slido reach roughly 2,000 to 5,000 participants, and Crowdpurr lists 5,000 on its Convention plan with more available a-la-carte, which makes them a better fit for classrooms, team events, and mid-size conferences than for stadium or festival crowds on a standard plan.
How many people can play a live quiz at once?
It depends entirely on the platform. As of August 2026, Kahoot’s standard plans reach about 2,000 (event plans to 5,000), Mentimeter クイズのスライド数を2,000に制限する。 Slido 企業では約5,000に達し、 Crowdpurr コンベンションプランでは最大5,000人まで収容可能で、アラカルトプランではさらに大規模な参加者にも対応できます。AhaSlidesは最大100,000万人まで対応可能で、実際にその規模のイベントが開催されています。
Can a quiz app handle thousands of participants?
Yes, but only some can, and the exact number matters. Several tools handle a few thousand, and a platform built for large-event scale is needed above that. For the full limit-by-limit breakdown, see 実際に数千人の参加者に対応できるクイズアプリはどれですか？.
Do participants need an app or an account to join?
No. On AhaSlides, the audience joins from a phone browser by scanning a QR code or entering a short code, with no app download and no account required. That matters at scale, because asking thousands of people to install an app before a quiz starts is where large events lose their crowd.
Run your large-event quiz
If your next event is bigger than a meeting room, start from the scale you need. AhaSlides is free to try and built to run live for up to 100,000 participants, with the leaderboard, Team mode, and QR-code join that a large audience needs. Explore the インタラクティブクイズ機能 or read the step-by-step guide to running a live quiz for a large audience2,500人以上のプレイヤーを想定していますか？ AhaSlides Enterpriseについて弊社のチームにお問い合わせください。100,000万人規模で建設された。
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