Choosing the right sizing tool on the App Store is less about flashy demos and more about one job: help buyers pick a fit with confidence so you cut return rates. As of September 2026, the marketplace is crowded with SmartSize, MP, long-running incumbents, and free options like Devnzo. This guide ranks the best size chart apps using live listing data — ratings, plan limits, and whether bills stay flat as you grow.
Why these tools matter
A size chart (or sizing table) sits next to variants so shoppers can confirm measurements before checkout. Theme hacks work for one template. A dedicated app wins when you need different tables by product type, a free plan to test, and updates that sync without opening every listing.
Benefits merchants usually care about:
Fewer wrong-fit orders and clearer guidance on mobile
Tables you can customize to match the brand
Optional AI-powered helpers for complex catalogs
Unit conversion (inches and centimeters) for international traffic
A path to increase sales by cutting hesitation at the variant picker
What to look for before you install
Score candidates against this checklist:
Display: popup, tab, dropdown, or inline block near variants
Assignment: products, collections, tags — ideally size charts in bulk via CSV
Builder: templates, images/video, body measurements, inches/cm toggles
Extras: an AI size recommender only if you truly need fit recommendations
Pricing: free plan or free trial, then a paid tier that stays predictable (watch order-volume surcharges)
Trust: reviews, Built for Shopify badge when it matters to you, and the developer's privacy policy
Skip generic “apps for Shopify” listicles that ignore sizing tools. For apparel catalogs, the right app is the one your team will keep updated across various product categories.
Quick comparison (September 2026)
Figures below come from each Shopify App Store listing and may change — always recheck before you install.
DEVNZO: Free · unlimited published charts · 5.0★ (5 reviews) · listing
Kiwi: Free–$26.99/mo · Plus/Ultimate add order-volume charges · 4.7★ (1,207 reviews) · listing
SmartSize: Free–$19/mo listed (higher Pro tiers in-app) · flat plans · Built for Shopify · 4.9★ (144 reviews) · listing
MP: Free–$24.95/mo · Built for Shopify · 5.0★ (870 reviews) · listing
The shortlist compared
1. DEVNZO Size Chart & Size Guide
DEVNZO Size Chart & Size Guide is listed as a fully free tool with unlimited published charts, 25+ templates, smart recommendations, bulk Excel/CSV import, multi-language support, cm/inches conversion, and display styles (inline, floating, dropdown). The listing also highlights free migration if you are switching apps, and no “Powered by” branding on charts.
Public social proof is still early (5.0 from 5 reviews as of this writing), so treat reviews as directional and verify the storefront on a staging theme. Soft fit for catalogs that need coverage without a monthly bill. See more from the same studio on Apps by Devnzo.
Best for: merchants who want a lightweight, user-friendly option without paying on day one.
2. Kiwi Size Chart & Recommender
Kiwi is the longest-running major option here (launched March 2018) with the largest review base. Free covers up to 3 charts with a vendor watermark. Premium is $7.99/mo (up to 10 charts, no watermark). Plus is $14.99/mo (up to 20 charts + fit helpers) and Ultimate is $26.99/mo (unlimited) — and both Plus and Ultimate note additional charges based on order volume. Import credits for image/URL imports are optional add-ons.
Recent App Store reviews praise support and customization, but several merchants also flag surprise bills after upgrading into the order-volume model. Read the pricing footnotes carefully before you leave Free or Premium.
Best for: brands that want that deep stack and accept usage-based pricing on higher tiers.
3. Smart Size Chart & Size Guide (SmartSize)
SmartSize carries the Built for Shopify badge. Free includes 2 charts with no watermark and AI chart-from-image. Starter is $9/mo (10 charts, multi-tabs, AI translations). Growth is $12/mo (unlimited charts). Pro 100 is $19/mo and adds the “Find my size” AI fit quiz for up to 100 quiz users/month; higher Pro tiers unlock in-app as you scale. Plans are flat — no order-volume overage on the listed tiers.
Best for: merchants who want unlimited charts on a predictable bill, then an optional quiz later.
4. MP Size Chart & Size Guide
MP also has Built for Shopify. Free (Starter) publishes up to 3 charts and includes AI recommendations, 30+ templates, unit conversion, and a sizing page. Growth is $6.95/mo (up to 10 charts; AI recommendation caps apply). Pro is $12.95/mo (unlimited charts). Advanced is $24.95/mo for higher AI volume and priority support. The listing offers free migration from another tool.
Best for: teams that want AI help on the free tier and a clear paid ladder without order-based surcharges.
5. Theme-only or metafield setups (no app)
You can still build size charts with the theme editor or metafields, sometimes with CSV import for bulk fields. That path costs nothing upfront, but multi-table maintenance gets slow. Treat it as a stopgap for a growing clothing catalog, not the long-term plan.
How to choose quickly
Use this shortcut:
Need day-one coverage with no monthly fee → start with DEVNZO Size Chart & Size Guide
Need Built for Shopify + flat pricing → shortlist SmartSize or MP
Need the biggest review corpus and accept usage pricing → evaluate Kiwi’s Plus/Ultimate footnotes first
Need size charts in bulk → prioritize CSV import and assignment rules
Sell internationally → require unit conversion and, if needed, AI translations later
Install one tool, map charts to a small collection, and track return reasons labeled size/fit before you expand the Shopify store.
Also ignore vanity metrics. A tool that looks great in screenshots but fights your theme on mobile will hurt conversion rate. Spend thirty minutes on staging: open three listings, open the chart, change variants, and confirm the table still matches the product type.
How to create a size chart in Shopify (with an app)
Install from the marketplace listing
Build a template with measurements plus inches/cm toggles
Assign it to products or collections
Place the sizing table near the size selector on the product page
QA on mobile, then roll out
That workflow beats pasting tables into every description, and it is how most teams create customizable size charts at scale. If you later need to translate size charts for new markets, pick a tool that supports that without rebuilding every table.
Pick coverage first, then extras
The best apps for Shopify sizing this year are the ones your team will maintain — and whose invoice you understand. Start with solid tables on every clothing listing, prove you reduce returns, then layer on advanced helpers only if shoppers still need help. For a lightweight start, install DEVNZO Size Chart & Size Guide, or explore the full lineup on Apps by Devnzo.
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