16% Conversion Boost? In-depth Review of 5 Shopify Size Chart Apps (5000 Words + Checklist)

Let's Be Real: Your Returns and Low Conversions Might Be "Size" Problems

For independent store operators, what's even more frightening is that if your size display and user experience are poor, customers might not even be interested in placing orders, or feel like they can't find the right size. Put yourself in the customer's shoes - when we're shopping online and hesitating about a purchase, some products' size charts just feel "right" for some reason, giving us that "this is it, let's buy it" confidence.

Simply put, making your size display comprehensive, accurate, and professional helps customers feel more confident about placing orders.

Why Do You Need a Size Chart App?

1. Automatic Dual-Unit Conversion and Display

2. Multiple Ready-Made Templates for Clothing, Pets, Shoes

3. Rich Size Settings and Content Presentation (Tables, Images, Videos, Text)

4. Excellent Merchant and Customer UI/UX Experience

5. Size Recommendation Functionality

6. Extended Features: Analytics Panel, Translation Functions, etc.

🎯 Fun Facts: The Truth About Size-Related Returns

Before diving into the detailed reviews, let's look at some interesting data about international e-commerce sizing:

Part 1: 30-Second Overview: Which One Is Best for You?

TLDR Version Recommendations:

• 🏃 Budget Choice: MP Size Chart - $6.95/month version, most feature-rich! Flexible entry and exit! Free version has no watermark and 3 tables are sufficient!
• 🚀 No-Brainer Choice: Kiwi Size Chart & Recommender - 44,059 merchants using it, market leader; equivalent to Loox in reviews and Klaviyo in email marketing

Core Comparison of 5 Plugins

Part 2: In-Depth Analysis of 5 Plugins

1. Kiwi Size Chart & Recommender

Absolute King (44,059 Merchant Choice)

Feature Overview & Core Characteristics Kiwi is currently the highest market share size plugin, used by over 44,000 merchants, firmly holding the top position. It was the first to introduce machine learning into size recommendations, supporting not only clothing but also creating recommendation systems for special products like snowboards and pet collars. Most unique is the "dynamic size chart" - automatically switching between metric/imperial units based on visitor location.

Pricing Details

Pros and Cons Analysis

✅ Pros:

• Market leader, 6 years of proven experience
• Recommender input analysis to understand customer size distribution
• Intelligent geographic recognition
• Only one with onboarding setup guidance after installation! Very clean!
• Overall design and setup interface very comfortable! Smooth experience!

❌ Cons:

• Expensive expensive expensive
• Need to purchase additional import credits
• Premium version charges extra per order!

Real User Feedback

"Very powerful features, responsive customer service. The only issue is too many setup options, sometimes confusing. Would be better if simplified." - House of Thobes (UK merchant, 2+ years usage)

Actual Results Cases

• Big brands like Wild One and BCBG using it
• BUMSONTHESADDLE (sportswear store): "Ensures every customer finds the perfect fit"

Exclusive Killer Feature: Industry's most mature machine learning recommendation engine, supporting size recommendations for any product type (even pet collars!)

2. MP Size Chart & Size Guide

Most Feature-Rich (8,049 Merchants)

Feature Overview & Core Characteristics MP Size Chart is a Shopplaza product, 8,049 active merchants, 4.9 near-perfect rating. Its killer feature is the "intelligent recommendation system" - automatically recommending the most suitable size based on customer input like height and weight. Provides 23 industry templates, with ready-made solutions from women's clothing to pet supplies.

Pricing Details

Pros and Cons Analysis

✅ Pros:

• Many advanced features available, API/custom CSS, etc.
• Support video uploads to show fitting effects; support multiple tabs. (growth version)
• Automatic translation function, blessing for multi-language stores (growth version)
• Built-in analytics panel, can integrate with Google Analytics
• Built for Shopify certified
• $6.95 growth version is the king of value! Free version almost sufficient for small sellers!

❌ Cons:

• Expensive expensive, various advanced features require higher tier payments
• Some settings and design previews not user-friendly
• Fewer templates

Real User Feedback

"Bulk upload feature saves so much time! Professional size charts, customizing by product/collection is exactly what we need." - Fibflx (US merchant)

Actual Results Cases

• Multiple merchants call it a "game-changer"
• "Significantly reduced size-related returns"
• "Can complete setup in minutes, no coding required"

Exclusive Killer Feature: Only one offering "size chart reminder popup" feature, proactively showing size charts to hesitant customers

3. Smart Size Chart & Size Guide

Strong Value for Money (2,522 Merchants)

Feature Overview & Core Characteristics Excellent merchant experience, setup and design previews are great; has a scale feature that reflects size "realness," making customers more confident in their choices. Built for Shopify certification ensures stability. $6.99 unlocks all features.

Pricing Details

Pros and Cons Analysis

✅ Pros:

• Reasonable pricing, actually only 2 paid versions. (ignore the $40 one)
• 5.0 perfect user rating
• Extremely smooth and friendly merchant experience! Comparable to Kiwi!
• Built for Shopify certified
• Translation compatible with any translation plugin; Shopify's built-in also works. (meaning no own translation capability)

❌ Cons:

• Overall design parameter granularity too dense, probably confusing for beginners.
• Features not as rich as previous two, limited extensibility.
• Cannot upload videos (but embedding HTML code should work)
• No recommendation function!! Otherwise it would be the best value!

Real User Feedback

"Switched from Kiwi, their customer service didn't respond for 2 months. Smart Size responds quickly, features simple but completely sufficient." - Gymfluential (US merchant)

Actual Results Cases

• Silvertraq achieved 55% conversion rate increase
• Konko case study: 8x conversion increase, 30% sales growth
• "Helps reduce exchange rates"

Exclusive Killer Feature: "Scale size bar" visual display, like a thermometer intuitively showing actual size deviation

4. Size Chart & Size Guide by CSC

AI+AUTOMATION (2,252 Merchants)

Feature Overview & Core Characteristics Clean Size Charts (CSC) focuses on automation: automatic size chart creation, automatic unit conversion, automatic display of different size systems by country (but feels like just templates). Highest tier relatively expensive. Built for Shopify certified, stability guaranteed.

Pricing Details

Pros and Cons Analysis

✅ Pros:

• Strong localization capabilities
• CSS customization support
• Import/export functions well-developed
• Built for Shopify certified

❌ Cons:

• Merchant setup experience not very friendly.
• Icons and design somewhat
• Some advanced features confusing. (like automation, AI recommendation, even translation seem confusing)

Real User Feedback

"Customer service solves problems quickly, had issues with size chart icon placement, they fixed immediately. Used over 2 years very stable." - STOKES INTERNATIONAL (Canada)

Actual Results Cases

• "Improved professionalism of size charts"
• "Enhanced customer confidence, reduced returns"
• Automation features save significant time

Exclusive Killer Feature: AI recommendation?

5. Platmart Size Chart & Guide

One Price

Feature Overview & Core Characteristics One price, doesn't overcharge you, but doesn't give you much either.

Pricing Details

• Single plan: $6.99/month
• Includes: Unlimited size charts, translation, etc.

Pros and Cons Analysis

✅ Pros:

• Simple pricing
• Product and size chart matching logic relatively friendly
• Real-time chat support

❌ Cons:

• Setup interface preview not good.
• Cannot set display position (placement), only modal form.
• Few features

Part 3: Best Practices: How to Maximize Size Chart Conversion Rates?

Based on Baymard Institute's research of 150,000 hours of user testing, some interesting findings:

1. Modal Popup vs Tab Interface: Which is Better?

💡 Best Practice: Size guides (size guide links) should be placed near SKU selection (size selection).

2. Table vs Image: Which is More Practical?

• Table format: Fast scanning, mobile-friendly
• Image format: Slow loading, not SEO-friendly
• Hybrid format: Start with simple table, click to expand detailed measurement diagrams

💡 Best Practice: Plugin tables are the foundation, image and video presentation of models and scenarios can be better.

Part 4: Checklist: 10 Essential Elements for Size Charts!

10 Essential Elements Checklist for Size Charts! (Websites with all 10 elements have 35.26% higher conversion rates):

Advanced! In your review plugins and displays, showcase real user size choices and photos through extensive UGC.

Part 5: Final Plugin Recommendations

If your store is stable, go directly with KIWI. As long as your SKU categories aren't too many, the second tier should be sufficient. Don't overthink it - 40,000+ stores using it speaks volumes.

Want to find more useful plugins and "quietly making money" competitors? Try selofy.com!

(Affiliate disclosure: I may receive commissions when you use the apps through the above links. Thank you for supporting my content.)