Kiwi Size Chart & Recommender Review, Tested 2026

Kiwi Size Chart & Recommender, built by Staytuned, solves one expensive problem: shoppers guessing their size. It adds clean, customizable size charts to product pages and pairs them with an AI recommender that asks a few questions and suggests the right fit. In our detection data it is the most-installed app in the sizing and returns-reduction category, well ahead of the next tool. The verdict upfront: for any apparel or footwear store, Kiwi is close to a default choice, because it is cheap, lightweight, and does the one job that removes the biggest reason for a return, the wrong size. The honest catch is that the parts most stores want, the AI recommender and the cleaner layouts, sit on the paid tiers, and the free plan caps you at a few charts with a watermark.

If you sell clothing, shoes, or anything where fit decides the refund, Kiwi earns its place, and the free plan lets you start at no cost. If your catalog has no real sizing, you do not need it. Compared with a full returns platform like Loop Returns, Kiwi works upstream: it prevents the wrong-size order rather than processing the return after it happens. The sections below use live detection data to show how widely Kiwi is used, what it does, what it costs, and the kind of store it fits.

What is Kiwi Size Chart & Recommender?

Kiwi is a Shopify app from Staytuned that tackles sizing uncertainty. It adds customizable size charts to product pages and pairs them with an AI recommender that asks a few questions and suggests the right fit. On the reference side it ships more than twenty chart templates, imports measurements in bulk by CSV or straight from a product description, and auto-converts units to a shopper’s local system. On the guidance side, the recommender turns a static chart into a personal answer, which is the part that moves the needle on returns. It holds a 4.7 out of 5 rating from more than 1,200 reviews on the Shopify App Store. Here is how widely it is installed across our dataset.

How popular is Kiwi?

Kiwi is the clear leader in its category. Live detection makes it the most-used app in the sizing and returns-reduction group, installed about 2.8 times as often as the next tool. Our taxonomy files sizing tools under returns because the wrong size is the single biggest driver of apparel refunds, and Kiwi sits at the top of that group. The stores that run it lean heavily toward apparel and footwear, the categories where fit decides whether a sale sticks.

The trend is quietly positive. Kiwi’s share of stores has edged up over the past several months rather than slipping, which fits a market where every apparel store eventually meets the returns problem and looks for a cheap way to cut it.

What does Kiwi do?

Three things. First, size charts: more than twenty templates, flexible layouts with images, videos and tabs, bulk import by CSV, and charts that auto-apply by product or collection so new products are covered without extra work. Second, the AI size recommender: a short set of questions that returns a suggested size, which is where the real returns reduction comes from. Third, the housekeeping that makes it painless at scale, automatic unit conversion by a shopper’s location, multi-language auto-translation, and analytics on how the recommender performs.

The point of all of it is confidence at the moment of choice. A shopper who is sure of their size is more likely to buy and far less likely to send the item back, which is why a sizing tool reads in our data as a returns app rather than a display widget.

Is Kiwi worth it?

For an apparel or footwear store, almost always. Sizing returns are expensive and frustrating for both sides, and Kiwi attacks the cause rather than the symptom for a few dollars a month. The free plan is enough to test the idea, and the paid tiers are cheap relative to the cost of even a handful of avoided returns.

Where it makes less sense is a catalog with no real sizing, such as homeware, digital goods or most electronics, where there is nothing for a chart or a recommender to do. And if you want the AI recommender and the cleaner layouts, budget for a paid tier, because the free plan is deliberately limited.

Which themes and apps run with Kiwi?

Because we detect both themes and apps, we can see the company Kiwi keeps. Its most common theme is Impulse, a conversion-focused apparel favourite, followed by Shopify’s free Dawn and the premium Prestige. Here are the themes most often running it.

The app side confirms the apparel profile. Most Kiwi stores also run Klaviyo for email and a reviews app, usually Loox or Judge.me, and many pair it with Yotpo or a variant-swatch tool like Swatch King. That is a classic apparel stack built around product pages and social proof. For the full breakdown of themes, paired apps and store types, see the live Kiwi usage statistics.

What kinds of stores use Kiwi?

Kiwi stores are apparel and footwear brands, plus a share of accessories and anything else sold by size. They tend to carry deeper catalogs than average, which fits: the more variants and sizes a store lists, the more a chart and a recommender pay back. These are stores where a size question is the last thing standing between a shopper and checkout.

Kiwi pros and cons

Unlike a chat widget, a size chart is a light addition to a product page, and the data shows it. Compared fairly against similar stores, the ones running Kiwi pass Google’s speed test (Core Web Vitals) at about the same rate as those without it, a difference well within the noise. In other words, Kiwi buys you fewer returns without a speed penalty, which is not something every conversion app can claim.

Who should use Kiwi?

Reach for Kiwi if you sell anything by size, apparel, footwear or accessories, and want to cut the returns and hesitation that come from sizing doubt. Start on the free plan to prove the concept, then move to a paid tier for the AI recommender and a watermark-free chart once you see it working. It is one of the highest-return, lowest-effort apps an apparel store can add.

Skip it if your catalog has no sizing dimension, or if you already have a fit solution baked into your theme that is doing the job. For everyone selling clothing or shoes, though, Kiwi is close to a default.