How to Add a Fit Quiz to a Shopify Store
By the ZeDaq.ai team · · 4 min read
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To add a fit quiz to a Shopify store, choose a quiz or fit-finder app from the Shopify App Store, map its answers to your size chart, and switch it on for your product pages. A fit quiz asks the shopper a few questions about their body and preferences, then suggests a size.
Quizzes are one of two common approaches. The other is a body scan. This guide covers how to set up a quiz, what makes the questions work, and when a scan is the better choice. If you are earlier in your planning, the overview of adding virtual try-on to Shopify shows how sizing and try-on fit together.
What is a fit quiz, and how does it choose a size?
A fit quiz is a short questionnaire shown on a product page or a dedicated page. Typical questions are height, weight, usual size, and whether the shopper likes a loose or tight fit.
The app converts those answers into estimated measurements, then compares them with your size chart. The result is a size label such as "M". Quiz quality depends on two things: how honest the answers are and how well your chart is built.
How do you add a fit quiz step by step?
The details differ between apps, but the process is similar.
- Prepare your size chart. Write body measurements for each size, by garment type. Without a good chart, any quiz is guessing.
- Pick an app. Read the listing, supported features and permissions on the Shopify App Store. Our best Shopify quiz apps for fashion stores guide compares the choices.
- Install and approve permissions. The app opens inside your admin.
- Set the questions. Keep them short. Each extra question costs you completions.
- Map answers to sizes. Connect the outcomes to your size labels.
- Turn it on in your theme. Most apps use an app embed or app block in the Theme Editor.
- Test on your phone. Take the quiz as several different shoppers and check the answers make sense.
Which questions should a fit quiz ask?
Fewer questions work better than many. Aim to ask only what changes the answer.
- Height and weight give a rough body estimate.
- Usual size in other brands helps anchor the result.
- Fit preference (snug, regular, relaxed) adjusts the size up or down.
- A problem area such as broad shoulders or a long torso, if your garments are sensitive to it.
Avoid asking for details you won't use. Also write answer choices in plain words, with no jargon.
What are the weak points of a quiz?
A quiz relies on what shoppers remember about their own bodies. People often misjudge their weight or their usual size, and brands label sizes differently.
That doesn't make a quiz useless. It is quick, familiar and works without a photo. But its accuracy is limited by self-reported answers, so compare it against a method that measures the body.
How is a body scan different from a quiz?
A body scan replaces self-reported answers with measurements taken from a photo. With ZeDaq.ai, the shopper uploads one photo and types their height. The scan takes around 30 seconds, and the measurements are matched to your own size chart.
This is not a questionnaire. ZeDaq.ai does not offer a fit quiz, so if a quiz is what you want, look to a quiz app. If you want sizing based on measurements instead, ZeDaq.ai adds "Find my size" next to the try-on button.
The deeper comparison is in size recommendation vs fit quiz apps, and photo-based vs questionnaire-based size recommendation goes into how each collects data.
How do you choose between a quiz and a scan?
| Question | Quiz leans better | Scan leans better |
|---|---|---|
| Do shoppers resist uploading a photo? | Yes | No |
| Is accuracy a priority? | Less so | More so |
| Do you want the shopper to see the garment on them? | No | Yes |
| Is the store small, with a limited budget? | Either | Either |
| Are your garments fitted? | Possibly | Often |
The table is a guide to your own judgment, not a measured result. You can also test both on a small set of products and compare which one your shoppers finish.
Where does your size chart come in?
Both rely on your chart. A scan or quiz can only suggest labels that exist in your chart, so it matters that your ranges meet without gaps. If you haven't built or checked yours, follow how to add a size chart to Shopify product pages first.
To install ZeDaq.ai, use the Shopify App Store listing. The Free plan includes 3 measurements a month, enough to test with your own chart before choosing a paid plan.
Try measurement-based sizing on your store
FAQs
Does ZeDaq.ai include a fit quiz?
No. It suggests a size from a short body scan, using one photo and the shopper's height, matched to your size chart.
How long should a fit quiz be?
Keep it as short as you can. Every question you add risks losing shoppers before they get a result.
Do I need a size chart for a quiz to work?
Yes. The quiz suggests labels from your chart, so a poor chart gives poor results.
Can I run a quiz and try-on together?
They can sit on the same page, but choose one sizing method to avoid confusing shoppers with two different answers.
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