Overview
Sizing confusion is a silent killer of ecommerce conversion. Shoppers who are unsure about fit either abandon the purchase or order the wrong size and return it. DEVNZO Size Chart & Size Guide solves this inside the Shopify storefront by giving merchants a fast way to add clean, on-brand size charts and a smart fit recommender to their product pages, with no developer or design work on the merchant's side.
The app was built and shipped under DEVNZO in the store-design and product-comparison category of the Shopify App Store, and has held a 5.0 rating since launch.
Live on the Shopify App Store: apps.shopify.com/mz-size-charts
The problem it solves
- Shoppers hesitate or bounce when they cannot confidently judge fit.
- Wrong-size purchases drive avoidable return and refund costs for merchants.
- Most size-chart solutions need manual per-product setup or theme code edits.
- Merchants selling internationally need charts in multiple units and languages.
Core features
- 25+ ready-made industry templates for apparel, footwear, jewelry and more, set up in minutes.
- Smart size recommender. Shoppers enter measurements and get an instant size suggestion, cutting return rates.
- Collection-based size guides. Assign a chart to a whole collection once, and it applies automatically and stays in sync as products are added.
- Advanced chart editor supporting text, images, video and tabbed layouts inside a single chart.
- Automatic unit conversion between cm and inches for shoppers.
- Flexible display modes. Inline, popup or floating button, adapting to any theme layout.
- Fully responsive, lightweight and mobile-ready by default.
- No "Powered by" branding, even on the free plan.
Tech stack
Built on the same core stack used across DEVNZO's Shopify app line:
- Frontend: React, TypeScript, Shopify Polaris for the admin UI
- Framework: Remix / React Router
- Backend and ORM: Prisma
- Platform integration: Shopify Admin API, Online Store theme app extensions, metaobjects for chart and template data
- Billing: Shopify Billing API, available for future paid tiers; the current plan is fully free
Data and permissions
The app requests the minimum scopes needed to render and manage charts on the storefront:
- Store owner info (name, email, phone, address): account and support contact.
- Edit products: attaching charts to products and collections.
- Edit Online Store (theme, script tags): injecting the chart UI into the storefront theme.
- Edit custom data (metaobjects and definitions): storing chart templates and configuration.
- Edit Shopify Admin files: storing uploaded chart images and media.
Localization
Ships in 16 languages: English, Spanish, French, German, Italian, Swedish, Japanese, Portuguese (Portugal), Dutch, Russian, Chinese (Simplified), Arabic, Hindi, Urdu, Turkish and Korean.
Pricing
A single free plan at $0 with unlimited published size charts, 25+ templates, the smart recommender, all display styles, full design control, unit conversion and no branding. If a paid tier is introduced later, charges will be billed in USD.
Merchant feedback
Rated 5.0 out of 5 across 3 reviews, all five-star, from Pakistan-based stores. Feedback consistently highlights fast, hassle-free setup, a responsive and professional support team, a strong free feature set with no compromises compared with paid competitors, and reliability over extended use, with one merchant citing 10 months of continuous use.
Market position
The app competes in the size-chart category against larger, longer-established players. From the App Store listings at the time of writing:
- DEVNZO Size Chart & Size Guide: 5.0, 3 reviews, free
- Kiwi Size Chart & Recommender: 4.8, 1,091 reviews, free plan available
- MP Size Chart & Size Guide: 5.0, 818 reviews, free to install
- BF Size Chart & Size Guide: 4.7, 127 reviews, free plan available
It is newer with a much smaller review base, but holds a perfect rating and undercuts most competitors by keeping the full feature set free.
Launch
Developed in-house at DEVNZO in Karachi, Pakistan, and launched on the Shopify App Store on July 23, 2025.
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