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Plouf-Ploufle retour
Coming soon

Verifiable draw

When fairness must be provable: a random draw whose authenticity each participant can verify themselves.

All our draws:

The verified draw uses a commit-reveal scheme: before the draw, we publish a SHA-256 hash of the list and a secret seed. At draw time, we reveal the seed — and anyone can recompute the hash and the winner to verify that nothing was changed after the fact.

It's exactly the guarantee you need for a YouTube or Twitch giveaway, a corporate contest, or any draw where participants don't trust by default. A pure-JavaScript verifier (open source) will be shipped so anyone can replay the computation independently.

This feature is part of the Streamer phase of the project. In the meantime, all plouf-plouf draws already use crypto.getRandomValues — cryptographically random, just not verifiable after the fact.

Try the classic draw meanwhile

FAQ

  • Is the random draw really random?

    Yes. We use your browser's crypto.getRandomValues with rejection sampling to avoid any modulo bias. Every participant has strictly the same probability of being picked.

  • Is my data sent to a server?

    No. Everything happens in your browser: participant entry, the draw itself, even the share-link generation. No server receives or stores your data.

  • How does sharing work?

    The link you copy already contains the whole result: the participants list and the winner. Your friend opens the link and sees the exact same draw, no sign-up, no account, on any device.

  • Does Plouf-Plouf work offline?

    Yes, the draw works without an internet connection once the page has loaded. Only sharing requires your recipient to be online to open the link.

  • Is there a participant limit?

    No limit for typical use — a classroom, a team, a group of friends, a secret santa. For very long lists (hundreds of names), sharing by link may become impractical, but the draw itself keeps working.

  • Can I use Plouf-Plouf in a classroom?

    Yes — it's one of the most natural uses of the site. No sign-up, no trackers, no advertising cookies: the tool fits classroom contexts and works well for picking students, teams, or volunteers at random.

  • Are you the old plouf-plouf.fr?

    No. The old plouf-plouf.fr is operated by an independent third party, and we have no legal or editorial connection to it. We share only the inspiration: the traditional French children's rhyme.