Alternatives · WAIR
WAIR alternatives for Shopify: size and fit apps compared
Short answer: WAIR is a size and fit recommendation app at $125 a month for the first 250 orders; alternatives include Virtusize and Measmerize for sizing alone, and AI Frame, Fittly or Rendered Fits if you also want shoppers to see the item on themselves.
WAIR, from Fit3D, recommends a size before checkout from shopper inputs and the product's fit intent, collects product fit reviews, and reports on shopper body shapes and return risk.
Disclosure: Rendered Fits publishes this page and is one of the alternatives. The facts below come from public Shopify App Store listings and vendor websites checked on 9 November 2026; we have not tested image or recommendation quality side by side. Listings change, so check them before you decide.
By Sienna Stones · Listings checked 9 November 2026
WAIR at a glance
| From the listing | |
|---|---|
| Developer | Fit3D, Inc. DBA WAIR (Rocklin, California) |
| What it does | Size recommendation modal, custom size recommendation AI, product fit reviews, performance reporting, sizing feedback with shopper body shape |
| Plans | WAIR Standard $125 a month, first 250 WAIR orders included, then $0.50 per WAIR-enabled order |
| Works with | Klaviyo, Loop Returns, Redo, Attentive, Fuego, Tapcart and Checkout |
| Rating | 4.7 from 33 reviews |
| Launched on Shopify | 15 August 2022 |
| Listing | WAIR Size & Fit Recommendation on the Shopify App Store |
Reasons to look at alternatives
- You want a free plan or a lower starting price while you test sizing.
- You want photo try-on alongside size advice in one app.
- You want size advice built from your own size chart rather than a vendor model.
WAIR alternatives compared
Monthly prices in USD as each Shopify App Store listing showed them on 9 November 2026.
| App | What it does | Free plan | Paid from |
|---|---|---|---|
| Virtusize | Size recommendations, fit visualisation | No ($1 first month) | $39 (200 orders) |
| Measmerize | Size recommender, size charts | No (14-day trial) | $49, adjusts with orders |
| Kiwi Size Chart | Size charts; size recommenders from Plus | 3 size charts | $7.99 charts; $14.99 with recommenders, plus additional charges based on order volume |
| AI Frame | Size charts, size recommender, photo try-on | 10 try-ons, 10 charts | $19.99 (80 try-ons) |
| Fittly | Size advice read from your charts, photo or body-type try-on | Free to install, $0.35 per try-on | $9 ($0.22 per try-on) |
| Rendered Fits | Size recommendations from your own chart, Complete the Look on paid plans (suggesting pieces from the brand's catalogue to wear together), photo try-on | 1 product sized, 5 try-ons a month | $349 (1,000 try-ons; 14-day trial, 50 try-ons) |
See all 17 apps, with top plans, ratings and launch dates, in our Shopify try-on app comparison (listings on that page last checked 20 October 2026).
Rendered Fits vs WAIR
| WAIR | Rendered Fits | |
|---|---|---|
| What it does | Size and fit recommendations, fit reviews, body-shape insights | Size recommendations from your own chart, Complete the Look on paid plans (suggesting pieces from the brand's catalogue to wear together), photo try-on |
| Pricing | $125 a month for 250 orders, then $0.50 per WAIR Enabled Order | Free; Complete $349 (1,000 try-ons per paid cycle; 14-day trial of 50 try-ons in total); Enterprise $999 (5,000), no trial |
| Free plan | No | Yes: 1 product, 5 try-ons a month |
| Try-on | Not described on the listing | Included on every plan (PREVIEW watermark on Free) |
When WAIR is the better choice
WAIR is the better choice if you want an established sizing app with a track record on Shopify (listed since 2022, rated 4.7 from 33 reviews), fit reviews from shoppers, and ready connections to Klaviyo and returns apps such as Loop Returns and Redo.
When Rendered Fits is the better choice
Rendered Fits is the better choice if you want a free plan to start on, size recommendations from your own size chart, and a try-on preview in the same app. Rendered Fits paid plans include Complete the Look and A/B testing. See the shopper journey or see pricing.
About Rendered Fits. Rendered Fits is a Shopify app for fashion brands that recommends a size for supported products from the brand's own size chart, and can show shoppers an optional AI try-on preview. There is a Free plan (one product, 5 try-ons a month). Complete is $349 a month, with a 14-day trial of 50 try-ons in total, then 1,000 try-ons per paid cycle. Enterprise is $999 a month, with 5,000 try-ons and no trial.
How to choose
- Decide which question your shoppers most need answered: "how will it look on me?", "which size?", or "what goes with it?".
- Shortlist two or three apps whose listings cover that question, and install their free plans or trials on the same products.
- Run the full journey on a phone, from product page to cart, and judge size advice separately from how realistic any image looks.
- Compare conversion and returns over the same period, not vendors' headline claims.
What Shopify merchants say about Rendered Fits
★★★★★ 5.0 from 2 Shopify App Store reviews
“Sienna & Sidney have been very responsive and adaptable to our needs. Its early days but first signs are that browsers are using the technology and it is contributing towards increased sales.”
Really Wild Clothing Company, United Kingdom · Shopify App Store review“Our partnership has significantly enhanced the customer shopping experience, resulting in increased sales and measurable value for our business. The team has been exceptional to work with—reliable, collaborative, and consistently committed to delivering high‑quality service”
University of St Andrews Shop, United Kingdom · Shopify App Store reviewSales comments are the merchants’ views, not an independently measured result.
Read Rendered Fits reviews · See the reviews on the Shopify App Store
Frequently asked questions
What is a good alternative to WAIR on Shopify?
Virtusize and Measmerize are sizing apps priced by orders. AI Frame, Fittly and Rendered Fits combine size advice with photo try-on and have free plans or free installs.
How much does WAIR cost?
On 9 November 2026 its Shopify listing showed WAIR Standard at $125 a month with the first 250 WAIR orders included and $0.50 per WAIR-enabled order after that.
Does WAIR offer virtual try-on?
Its listing describes size and fit recommendations, fit reviews and body-shape insights. It does not describe photo try-on.
Similar apps: Virtusize alternatives · True Fit alternatives · Measmerize alternatives
More comparisons: all alternatives · 17 Shopify try-on apps compared · Rendered Fits pricing