Size Chart Apps vs Size Recommendation Apps on Shopify

A size chart app shows shoppers your measurement table and leaves them to choose, while a size recommendation app asks about the shopper and picks a size for them. Chart apps are cheaper and simpler. Recommendation apps take more setup but answer the question shoppers actually have: "which size do I order?"

ZeDaq.ai publishes this blog and makes a size recommendation tool. Competitor details come only from each company's Shopify App Store listing, checked November 2026. Size tools often sit next to try-on on the same product page, so our Shopify try-on app roundup is a useful companion read.

What is the difference between a size chart app and a size recommendation app?

The difference is who does the work of choosing a size.

With a size chart app, the shopper does it. They open a table, find a tape measure, measure themselves and compare their numbers to your ranges.

With a size recommendation app, the app does it. The shopper shares some information, and the app returns one size. That information can come from:

• A questionnaire. Height, weight, age, body shape and fit preference.
• Typed measurements. The shopper enters chest, waist or hips.
• A body scan. The app measures the shopper from a photo.

Both kinds depend on your size chart. A recommender still needs your ranges to know which label to suggest.

How do the two types compare side by side?

	Size chart app	Size recommendation app
What the shopper sees	A table of measurements	One suggested size
Effort for the shopper	Find a tape, measure, compare	Answer questions or take a photo
Setup for you	Enter or import charts	Enter charts, then test suggestions
Typical extras	Images, tabs, unit switching	Analytics, fit notes, size scales
Best for	Simple sizing, repeat shoppers	Varied cuts, new shoppers, fit questions

Neither type is better in every store. The right choice depends on your products and who buys them.

Which Shopify apps fall into each group?

Here are real examples from the Shopify App Store, checked November 2026. Prices are in USD and can change.

Chart-first apps

• ESC Size Charts by Eastside Co lists charts from templates, assigned by tags, collections, products, vendors or product type. It is free for up to 3 charts, or $4.99 a month for unlimited charts.
• Your theme's size chart. Shopify's free Dawn theme lists "Size chart" as a feature on the Theme Store, checked November 2026.

Apps that do both

• Kiwi Size Chart & Recommender lists chart import from images, product descriptions or CSV, plus AI-powered size recommendations. Plans run from Free to $26.99 a month.
• True2Size lists size charts plus a recommendation with a confidence score after a short questionnaire or typed measurements. Plans run from Free to $49 a month.

Recommendation-first apps

• Fit Quiz by Easysize lists fit, width and length advice per product and UK, EU, US and custom size scales. Plans run from $29 to $249 a month, plus $0.15 per item added to cart with a Fit Quiz recommendation.
• ZeDaq.ai uses a 30-second body scan from one photo plus height, matched to the chart you enter in the app. The same app adds AI virtual try-on.

For more recommenders in one place, see our comparison of size recommendation apps.

When is a size chart app enough?

A chart is often all you need. Choose a chart-first tool when most of these are true:

• Your sizing is simple. One-size accessories, stretch basics or S, M, L tees.
• Most buyers are returning customers. They already know their size with you.
• Your fit is consistent. Every top in the store follows the same block.
• Fit questions are rare. Customer service seldom hears "which size?"
• Budget is tight. Chart apps start free on the listings above.

If that sounds like your store, our size chart app comparison covers the chart-first options in more detail.

When do you need a size recommendation app?

A recommender earns its place when the chart alone leaves shoppers unsure. Look for these signs:

• Mixed cuts in one category. A slim shirt and a boxy overshirt both labeled "M."
• Many first-time buyers. Paid social and marketplace traffic often lands on one product with no history.
• Measurement-sensitive garments. Dresses, tailored trousers and outerwear need more than one measurement to fit.
• Shoppers ordering two sizes. That pattern usually means they don't trust the chart.
• Lots of "which size?" messages. Each message is a shopper who stopped to ask instead of buying.

Where can you find these signs in your own store?

You don't need special software to check. Three places in Shopify and your inbox tell most of the story:

1. Orders. Filter recent orders for the same product in two sizes on one order. Note which products come up most.
2. Return reasons. If your returns form asks for a reason, count how many say "too small," "too big" or "didn't fit."
3. Customer messages. Search your inbox or chat for "size," "fit" and "measurements" over the last month.

Write the top five products from each list side by side. Products that appear on two or three lists are where a recommender is most likely to help. Products that appear on none may be fine with a chart. This also tells you where to test first, so your trial period is spent on the products that matter.

How do costs compare as your store grows?

Chart apps usually charge a flat monthly fee. Recommenders often add usage fees, so cost grows with traffic.

Worked example

Suppose 1,000 items a month are added to cart with a recommendation. On the Fit Quiz listing, the Starter plan is $29 a month plus $0.15 per item, so that month would cost $29 plus $150, or $179.

On the ESC listing, Premium stays at $4.99 a month whatever your volume, but it shows a table rather than a suggested size.

On the True2Size listing, the Free plan covers up to 500 add-to-carts a month and Starter at $19 a month covers up to 5,000. So the same 1,000 add-to-carts would sit in the $19 plan.

ZeDaq.ai counts each size scan as one measurement. The Free plan includes 3 measurements a month for testing, and paid plans are Micro at $14, Starter at $49, Growth at $129 and Scale at $299 a month. Every paid plan has a 3-day free trial with no card required.

Run the same sum with your own traffic before you decide. A tool that looks cheap at launch can cost more at peak season, and the reverse is also true.

Can you use a chart and a recommender together?

Yes, and many stores do. The two serve different shoppers.

Some people like to read every number. Others want a single answer. Offering both lets each shopper choose.

A combined setup usually looks like this:

1. Keep a readable chart linked near the size selector for shoppers who want the table.
2. Add a "Find my size" button that returns one label for shoppers who want an answer.
3. Use one source of truth. Enter the same ranges in both, so the table and the suggestion never disagree.
4. Write a fit note per product. "Runs small" or "relaxed fit" helps both groups.

The third step matters most. If your chart says a 34-inch waist is a 32 but the recommender says 34, shoppers stop trusting both. Our guide to matching your chart in a try-on app shows which fields to keep identical.

How do you decide in ten minutes?

Answer these four questions:

1. Do more than a few customers a week ask which size to buy? If yes, lean toward a recommender.
2. Do your cuts vary within one garment type? If yes, lean toward a recommender.
3. Is most of your revenue from repeat customers? If yes, a chart may be enough.
4. Is your monthly app budget under the cost of a recommender at your volume? If yes, start with a chart and revisit later.

Two or more "recommender" answers is a good sign you've outgrown a chart alone. Start with a free plan or trial, test on five products across garment types, and check the suggestions against your own body or a staff member's.

FAQs

Does a size recommendation app replace my size chart?

No. The recommender uses your chart to decide which label to suggest, so you still need accurate ranges.

Are questionnaire recommenders less accurate than body scans?

It depends on the shopper and the garment. Questionnaires estimate measurements from answers, while scans measure from a photo, so test both on your own products.

Will a size app slow down my product pages?

Any app adds some code. Load the product page on a phone before and after you install, and remove apps you no longer use.

Can I switch from a chart app to a recommender later?

Yes. Keep your charts in a spreadsheet so you can enter them in a new tool quickly.