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Size Finder Lite - Now Available on Shopify App Store (Free Trial)

Clothing Size & Fit Finder APIs

Prime AI’s Clothing Size & Fit Finder APIs deliver precise size recommendations while enhancing your entire tech stack with hyper-personalisation and rich fit intelligence.

The API connects seamlessly with your existing e-commerce systems, giving you access to meaningful data around:

  • Shopper behaviour

  • Product demand and size preferences

  • Fit-related anomalies and patterns

  • Missed sales opportunities

This integration allows your sales, marketing, and merchandising teams to make smarter decisions based on real-time sizing trends and conversion performance.

Prime AI’s API isn’t just for recommendations – it acts as a smart data layer that powers operational decisions and fuels performance across your business.

Virtual Try-On (VTO) ready:

Our API also supports Virtual Try-On technology by providing predicted body part dimensions. This allows VTO providers to generate realistic, size-accurate avatars, giving your shoppers a true-to-life fit simulation experience.

Why it matters

By integrating with Prime AI’s API, you gain more than just a size finder, you gain a data intelligence engine that drives everything from personalisation to profitability.

It’s precision fit, predictive analytics, and plug-and-play efficiency – all in one.

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Still not sure which is right for you?

Reviews

Anna - Digital Director (UK)
Handy tool and fantastic customer service
The tool allows us to offer accurate fitting information to our customers, including information based on returns to maintain accuracy. The Prime AI team are very helpful if/when issues arise, and are quick at responding and solving problems, as well as suggesting new ways the tool can be implemented.
Denis - Performance Marketing Manager (Romania)
Efficient Cooperation
Our cooperation with Prime AI is very successful, we are happy with the results. Also, optimisation of the tool has been implemented after multiple feedback sessions to which Prime AI has been very open. The UX was not the best, but after multiple feedback sessions, things got fixed.
Rosie - Head of e-commerce and brand (UK)
Great software and amazing account management
Prime AI's account management and monthly reports/ recommendations have been brilliant. We have been able to customise the platform to suit our needs and no ask is ever too much 🙂 ... We have been able to make informed, strategic business decisions and the product is great from a user interface point of view with seamless integration.

Case Studies

Multi-brand retail return reduction case study showing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in online fashion retail.
Multi-brand Retail Return Reduction: How Prime AI Slashes Returns

Multi-brand Retail Return Reduction: How Prime AI Slashes Returns

YAS return reduction case study showing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in online fashion retail.
YAS Return Reduction: How Prime AI Slashes Returns

YAS Return Reduction: How Prime AI Slashes Returns

ViCOLO return reduction case study showcasing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in men’s fashion e-commerce.
ViCOLO Return Reduction: How Prime AI Slashes Returns

ViCOLO Return Reduction: How Prime AI Slashes Returns

Emme return reduction case study showcasing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in men’s fashion e-commerce.
Emme Return Reduction: How Prime AI Slashes Returns

Emme Return Reduction: How Prime AI Slashes Returns

Noisy May return reduction case study showcasing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in men’s fashion e-commerce.
Noisy May Return Reduction: How Prime AI Slashes Returns

Noisy May Return Reduction: How Prime AI Slashes Returns

Jack & Jones return reduction case study showcasing how Prime AI’s size recommendation tool helped reduce return rates and improve sizing confidence in men’s fashion e-commerce.
Jack & Jones Return Reduction: How Prime AI Slashes Returns

Jack & Jones Return Reduction: How Prime AI Slashes Returns

Joop! return reduction case study highlighting how Prime AI’s size recommendation tool helped lower return rates and improve fit accuracy in fashion e-commerce.
Joop! Return Reduction: How Prime AI Slashes Returns

Joop! Return Reduction: How Prime AI Slashes Returns

Vila return reduction case study demonstrating how Prime AI’s size recommendation tool helped lower return rates and improve fit accuracy in online fashion retail.
Vila Return Reduction: How Prime AI Slashes Returns

Vila Return Reduction: How Prime AI Slashes Returns

SoyaConcept Return Reduction: How Prime AI Slashes Returns

SoyaConcept Return Reduction: How Prime AI Slashes Returns

Someday return reduction case study demonstrating how Prime AI’s size recommendation tool helped reduce return rates and improve fit accuracy in online fashion retail.
Someday Return Reduction: How Prime AI Slashes Returns

Someday Return Reduction: How Prime AI Slashes Returns

Opus return reduction case study showing how Prime AI’s size recommendation tool helped lower return rates and improve sizing accuracy in online fashion retail.
Opus Return Reduction: How Prime AI Slashes Returns

Opus Return Reduction: How Prime AI Slashes Returns

Penny Black return reduction case study highlighting how Prime AI’s size recommendation tool helped reduce return rates and improve fit accuracy in fashion e-commerce.
Penny Black Return Reduction: How Prime AI Slashes Returns

Penny Black Return Reduction: How Prime AI Slashes Returns

We analyed 1,000,000 returns. Here's what we found...

Arabic size recommendation widget on Scrubser’s product page, showcasing full right-to-left language support for Middle Eastern fashion and workwear retailers
Arabic Size Recommendation Widget for Fashion & Workwear

Arabic Size Recommendation Widget for Fashion & Workwear

A stylish model in a blue-striped outfit with a digital data background, representing insights from analysing 1 million online returns. Text overlay reads ‘Lessons from 1,000,000 Returns – 3’, reinforcing the key theme of how poor fit leads to lost customers.
Poor Fit Leads to Lost Customers – Lesson 3: Stop Return-Driven Churn

Poor Fit Leads to Lost Customers – Lesson 3: Stop Return-Driven Churn

Bracketing in online shopping – Lessons from 1,000,000 returns. Image of a woman wearing a navy knit two-piece outfit, with a futuristic digital background.
Bracketing in Online Shopping – Lesson 2 from 1M Returns

Bracketing in Online Shopping – Lesson 2 from 1M Returns

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