How do I reduce wrong-size returns on Shopify?
Size and fit are the number-one reason clothing gets returned online, so the fastest way to cut returns is to stop shoppers guessing their size before they order. Every wrong-size return eats the shipping both ways, the restocking labour, and often the item itself. You have three real options: a detailed size chart, richer fit information on the product page, or a size-recommendation quiz that just tells each shopper what to buy. This guide is about that third route, the one that removes the guesswork entirely, built around Fit Quiz by Easysize, the best-known Shopify app for it (a 15-second quiz that recommends a size with no body measurements, 4.4 stars across 34 reviews). It works well, but its pricing has a sharp edge you need to understand before you install it.
We build Shopify apps ourselves (variant images and combined listings), so we read app listings the way a skeptical merchant should: how does the tech actually work, how is the billing metered, and what do the one-star reviews complain about? All of that is below, including the two reviewers who used the word “scam” and whether they had a point.
In this guide
- What is Fit Quiz, and how does it cut returns?
- How does Fit Quiz recommend a size without measurements?
- How much does Fit Quiz cost?
- What do merchants say?
- Where Fit Quiz shines
- Where it falls short
- Is Fit Quiz worth it over a cheap size-chart app?
- How do you set up Fit Quiz?
- Pairing it with a variant-heavy catalog
- FAQ
What is Fit Quiz, and how does it cut returns?
Fit Quiz is a size recommender for clothing and footwear brands, built by Easysize ApS, a fashion-sizing company headquartered in Copenhagen, Denmark with a team spread across several countries. It drops a small “What’s my size?” widget onto your product page. The shopper answers a few quick questions (usual size, fit preference, that sort of thing), and Fit Quiz returns a specific recommendation: not just the size, but the fit, width, and length, right down to the individual SKU. The whole thing takes about 15 seconds and never asks for weight, body measurements, or a body scan. For a shopper hovering between a medium and a large at 11pm, that’s the difference between buying and bouncing.
It’s aimed squarely at apparel and footwear, including unisex sizing, and it supports UK, EU, US, and custom size formats with content auto-localised across 20 languages per the App Store listing. If you sell anything that comes in sizes and gets returned when the fit is wrong, this is the category of tool built for you. If you sell mugs, it isn’t. Easysize’s own materials say Fit Quiz is their flagship product, and the app has been on the Shopify App Store since November 2021, so it’s not a weekend project. Its listing also flags kids’ fashion and bra cup sizing as coming soon, so the addressable range is widening.
How does Fit Quiz recommend a size without measurements?
This is the part that makes people skeptical, and fairly so. How do you recommend a size without measuring anyone? Easysize’s answer is data. By their own account, the recommendation engine is a machine-learning model trained on the shopping and fit behaviour of a very large pool of shoppers (Easysize says over 18 million, though that’s the company’s own self-reported figure, not independently audited). Instead of asking you your chest measurement, it matches your quick answers against patterns it has already learned from millions of purchases and, crucially, returns. The model, Easysize says, gets stronger with every brand that joins.
Is that better than a static size chart? For the shopper, almost certainly yes. A size chart makes the customer do the work: find a tape measure, measure themselves, interpret a grid, and hope the brand’s “medium” matches their idea of one. Most people don’t bother, they guess, and the guess is where returns come from. A recommender that just says “get the large” removes the friction. The honest caveat: a data-pattern model is only as good as the data behind your specific products, and a recommendation is still a probability, not a promise. It won’t be right 100% of the time. But directionally, nudging a guesser toward the statistically likely size beats leaving them to coin-flip.
How much does Fit Quiz cost?
Here’s where you need to pay attention, because it’s the single most important thing about this app and the thing its unhappy reviewers missed until the bill arrived. Fit Quiz has three monthly plans, and every one of them charges a flat fee plus a usage fee:
| Plan | Monthly base | Usage fee | Key features |
|---|---|---|---|
| Starter | $35/mo | + $0.15 per add-to-cart via Fit Quiz | Customisation, multi-lingual, unisex, dashboard |
| Pro | $125/mo | + $0.15 per add-to-cart via Fit Quiz | Multiple size scales, fit/width/length, advanced reports |
| Premium | $250/mo | + $0.15 per add-to-cart via Fit Quiz | White-labeling, custom logic, custom reports |
Read that usage column twice. You pay 15 cents every time a shopper uses the quiz and adds the recommended size to their cart, on top of the monthly fee, and that charge has no visible cap. Do the arithmetic on a store doing real volume: a few thousand quiz-assisted add-to-carts a month and your “$35 app” is a several-hundred-dollar app. The logic is that you only pay when the app does its job, which is defensible, but it also means your cost scales with your success in a way a flat subscription never does, and a spike in traffic is a spike in your bill.
There’s an escape hatch most people don’t notice: Easysize’s annual plans remove the per-add-to-cart fee entirely. The catch is that the annual price is a minimum that scales with your monthly order volume (it starts around $750/year for Starter and climbs from there). So the real decision isn’t “which plan,” it’s “which pricing model”: pay-as-you-go monthly with an uncapped per-cart meter, or an annual base that’s higher up front but predictable. For a high-volume store, the annual route is almost certainly cheaper and saner. Before you commit either way, model the per-add-to-cart cost against your actual traffic. Our ROAS calculator and profit margin calculator will tell you fast whether the returns you save cover the fee you pay.
What do merchants say about Fit Quiz?
The 4.4 rating splits cleanly: a big cluster of five-star reviews praising the support and the conversion lift, and a small number of one-star reviews that are all about one thing, the bill. Start with the positive, because it’s genuine and detailed.
“Customer service has been exceptional. Julia and the team are quick to respond and always proactive with suggestions. The app integrates cleanly into our custom Shopify theme without interfering with the design or performance. We’ve seen a genuine uptick in conversion since installing Fit Quiz and have just upgraded to the Premium plan.”
JACK1T, United Kingdom, May 2026 — Fit Quiz on the Shopify App Store
And a long-tenured one, which matters because retention is the real signal for this kind of app:
“Really recommend both the app and the developer / support team behind it. We’ve used this for a number of years and we’ve been really impressed with how well the app works for us and how user friendly it is.”
Charlotte Mills, United Kingdom, July 2026 (over 3 years using the app) — Fit Quiz on the Shopify App Store
Now the other side, because a review that only shows the good ones isn’t a review. One merchant wrote, bluntly: “omg. 15 cent per add to cart. i was billed so high for a month this is a scam.” A second merchant, months earlier, left a similar complaint about an “unexpected” bill far above the subscription. Two different stores, same shock. Easysize replied publicly to the first with hard numbers: that 57% of orders in supported categories came after using the app, that conversion was 233% higher with it than without, and that usage fees are disclosed when you activate the subscription and shown on the Billing page at any time. So is it a scam? No. The fee is real, it’s disclosed at signup, and the app appears to have earned its keep on that store. But “disclosed” and “obvious” aren’t the same thing, and an uncapped success fee will always surprise the merchant who didn’t model it. Both things are true at once.
Where Fit Quiz shines
- Zero-friction for the shopper. No tape measure, no body scan, no measurement form. A few taps and a size. That’s why it converts.
- SKU-level fit, not just size. It surfaces fit, width, and length per SKU, which matters for footwear and for brands whose “medium” runs small.
- Return-and-conversion reporting built in. The dashboard ties recommendations to sales lift and return rates, so you can actually see whether it’s working instead of guessing.
- Returns-stack integrations. It connects to Loop Returns, ReturnGo, AfterShip, Happy Returns, Klaviyo, and Sendcloud, so the fit data can flow into how you handle returns and marketing.
- Support that reviewers single out by name. Multiple reviews praise the responsiveness, and one store has stayed on it for over three years.
Where it falls short
- The uncapped usage fee. This is the big one. $0.15 per quiz-assisted add-to-cart with no cap means your cost rises with your volume, and two merchants got a bill that shocked them. Model it first, or take the annual plan that removes the fee.
- The $35/mo floor plus usage is steep for small stores. A shop doing a handful of apparel orders a week will struggle to justify it against a free or $7 size-chart app.
- Apparel and footwear only. Obvious, but worth stating: there’s no use case outside sized products.
- The headline stats are self-reported. Easysize’s aggregate claims (around 60% more sales, 30% fewer returns, 15x ROI) come from the vendor’s own case studies, not independent audits. Treat them as a best case to test against, not a guarantee.
- No free plan. Just a 10-day trial, which is short for a tool whose value shows up in return rates over a full buying cycle.
Is Fit Quiz worth it over a cheap size-chart app?
The honest comparison isn’t Fit Quiz against another premium recommender, it’s Fit Quiz against the much cheaper size-chart apps that most stores reach for first. There’s a real difference in what you’re buying.
| App | Rating (reviews) | Cheapest paid | What it does |
|---|---|---|---|
| Fit Quiz | 4.4 (34) | $35/mo + $0.15/cart | ML size recommender quiz |
| Kiwi Size Chart & Recommender | 4.8 (1,080) | $6.99/mo (free tier) | Size charts + AI recommender |
| MP Size Chart & Size Guide | 5.0 (815) | $6.95/mo (free tier) | Size charts, light AI |
Kiwi Size Chart & Recommender by Staytuned (4.8 across more than 1,000 reviews, free tier, from $6.99/mo) is the alternative to weigh most seriously. It’s a hybrid: proper customisable size charts plus an AI recommender, at a fraction of Fit Quiz’s cost and with a free plan to start on. MP Size Chart (5.0 across 815 reviews, free tier) is more of a straight chart tool. Neither charges a per-add-to-cart fee. So why would you pay for Fit Quiz? Because a dedicated, data-trained recommender that outputs fit, width, and length per SKU is a deeper tool than a chart with a recommendation bolted on, and for a high-AOV fashion brand bleeding money on size returns, that depth can pay for itself many times over. But if you’re cost-sensitive, lower-volume, or just want a clean size chart, the cheaper apps are the smarter first move, and there’s no shame in starting there. Be honest with yourself about which store you’re running.
How do you set up Fit Quiz?
Setup is the easy part. You don’t need to upload size charts or garment measurements to get started, which removes the single most tedious step of most sizing tools. You install the app, place the widget on your product template, customise the colours, fonts, and icons to match your theme (reviewers specifically note it doesn’t fight custom themes), and switch it on. The recommendation engine does the heavy lifting from Easysize’s side. From there, the integrations with Loop Returns, ReturnGo, AfterShip, Klaviyo, Happy Returns, and Sendcloud let the fit data feed your returns and email flows, which is where a fit tool earns compounding value: fewer wrong-size orders now, and better data on why returns happen later. If reducing returns is a priority for your store, it pairs naturally with the wider tactics in our guide to preventing returns with better product information.
Pairing Fit Quiz with a variant-heavy catalog
Here’s the part we care about, because it’s our lane. A fit quiz recommends the right size, but the shopper still has to see the right product. Fashion catalogs are variant-heavy by nature: the same jacket in four colours and six sizes, and if your product page shows the wrong photo for the colour they picked, or your collection page lists the same shirt as eight separate products, a perfect size recommendation still lands on a confusing page. Sizing and merchandising are two halves of the same conversion problem. Getting the size right with Fit Quiz works best when every colour and size variant shows the correct image, and when separate colour products are grouped into one clean apparel listing instead of scattered across the collection. Size confidence plus visual clarity is how a fashion product page actually converts. We go deeper on the display side in our notes on reducing returns through better variant display and size charts per variant.
Frequently asked questions
How much does Fit Quiz really cost?
On monthly plans, a flat fee ($35 Starter, $125 Pro, $250 Premium) plus $0.15 for every add-to-cart made through a Fit Quiz recommendation, with no cap on the usage portion. So your real cost scales with how many shoppers use the quiz and buy. Annual plans remove the per-add-to-cart fee but set a base price that scales with your order volume (from roughly $750/year). Model the per-cart fee against your traffic before installing, or choose annual for predictability.
Does Fit Quiz need body measurements?
No. That’s its main selling point. It asks a few quick preference questions and returns a size using a machine-learning model trained on aggregate shopper and return data, with no weight questions, body measurements, or body scans. The trade-off is that a recommendation is a probability based on patterns, not a guaranteed exact fit, but it removes the friction that makes shoppers guess and return.
Is Fit Quiz worth it, or should I use a size chart app?
It depends on your volume and margins. For a high-AOV fashion or footwear brand where size returns cost real money, a dedicated recommender like Fit Quiz can pay for itself. For a smaller, cost-sensitive, or lower-margin store, a cheaper hybrid like Kiwi Size Chart & Recommender (free tier, from $6.99/mo) or a straight size-chart app is the smarter starting point. Match the tool to how much returns are actually costing you.
Why did some reviewers call Fit Quiz a scam?
Two merchants were surprised by a bill much higher than the base subscription, driven by the $0.15 per-add-to-cart usage fee at high volume. The developer responded that the fee is disclosed at signup and on the Billing page, and that the app drove a large share of the store’s orders. The fee isn’t hidden, but it is uncapped and success-metered, so a store that doesn’t model it can get a surprise. That’s a pricing-transparency gripe, not evidence of fraud.
What does Fit Quiz integrate with?
Shopify Admin plus a returns and marketing stack: Loop Returns, ReturnGo, AfterShip, Happy Returns, Klaviyo, and Sendcloud. That lets the fit and recommendation data flow into how you process returns and how you segment customers, which is where a sizing tool builds compounding value over time.
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Umid
Co-Founder at Craftshift