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Card sorting, made clear

Find the structure your users expect.

See how people group your content before you commit to a navigation. Create a study, share one link, and learn from every sort.

Create your first study See how it works
Open, closed, or hybrid No participant account Free in beta

Flexible by design

Choose how much structure to give.

Start from a blank slate or test a navigation you already have. Each study gives people a simple way to show you what makes sense.

01 / 03

Open sorting

Let participants create their own categories. See the language and groupings that come naturally to them.

Participants define the structure
02 / 03

Closed sorting

Give people your proposed categories and learn whether the structure works the way you intended.

You define the categories
03 / 03

Hybrid sorting

Start with your categories and leave room for new ones. Useful when your structure is almost there.

Find the missing pieces

The result

Clarity you can act on.

See where participants agree, where they hesitate, and which categories need another look.

Explore your results

A simpler workflow

From idea to insight in three steps.

Spend less time setting up research and more time making sense of what people show you.

Create a study
  1. 01

    Create

    Start with your cards

    Add your content, choose a study type, and make it yours. Import a CSV if your list is ready.

  2. 02

    Share

    Send one simple link

    Participants sort at their own pace, on any device. They never need to create an account.

  3. 03

    Learn

    See the patterns emerge

    Agreement scores and similarity views show which parts of your navigation feel natural.

Good to know

A few things you might be wondering.

Straight answers before you start your first study.

Is it really free?

Yes. It's in beta and free to use. No limits on studies or participants.

Do participants need to sign up?

No. You share a link, they sort cards. No account needed on their end.

Can I export my data?

Yes. Raw data and analysis results export as CSV.

How many cards can I add?

Up to 100 per study. 30-50 tends to work best for participants.

Is my data private?

Studies are only accessible through their unique link. We don't track participants or sell data.

How is this different from Optimal Workshop?

Populux does one thing: card sorting. It's free, it's fast to set up, and you don't need to negotiate an enterprise contract to use it.

What happens when beta ends?

There will always be a free tier. If we add paid plans, your existing studies and data won't be affected.

Start with what you have

See your content through your users' eyes.

A clearer structure starts with one study. Set yours up in minutes and let the patterns speak for themselves.

Create your first study Free in beta. No participant signup.