How does a simple Shopify plugin evolve into a tool generating $36K/month in recurring revenue?

It’s a story of persistence, customer obsession, and relentless product innovation.

Kiwi Sizing, founded by Sam Chuang in 2018, started as a side project to solve a specific pain point in e-commerce: Sizing. What began as a tool to convert size chart measurements has grown into the #1 sizing solution on Shopify, now serving 13,000+ active stores worldwide.

This is how Sam turned a frustrating problem into a thriving SaaS business.

The Problem They Solved

Online shopping comes with a major pain point: Sizing discrepancies lead to unhappy customers and high return rates.

For e-commerce merchants, managing size charts is tedious and error-prone, especially when dealing with hundreds of products from different vendors.

For customers, vague or incorrect sizing information creates confusion, leading to lost sales and increased returns.

Kiwi Sizing’s solution:

• Simplified size chart management
• Machine learning fit recommenders

By solving these problems, Kiwi Sizing not only reduced friction for merchants but also improved the shopping experience for their customers.

The Strategy

Kiwi Sizing turned a niche problem into a thriving SaaS business by focusing on solving a common e-commerce challenge: managing size charts. By creating a simple, effective solution tailored to merchants and their customers, the platform quickly gained traction.

Founder Sam Chuang’s hands-on approach to customer support played a key role in the company’s success. Direct interaction with over 5,000 customers provided invaluable insights that shaped product development and positioned Kiwi Sizing as the go-to sizing tool for Shopify users.

Continuous innovation kept the platform ahead of its competitors. 🚀

From adding advanced features like machine-learning-driven fit recommenders to expanding beyond Shopify, Kiwi Sizing evolved into a comprehensive solution trusted by over 13,000 stores worldwide.

Customer Obsession Turned Into Automation

By focusing on these strategies, Kiwi Sizing consistently scaled its user base and revenue:

• Customer Obsession: Listening to feedback and solving real pain points.
• Feature Development: Adding advanced tools like AI-powered recommenders and analytics.
• Diversification: Expanding to other platforms like WooCommerce and BigCommerce.
• Freemium Model: Offering a free plan to drive adoption and visibility.
• Automation: Streamlining customer support and marketing processes.

Kiwi Sizing’s approach is a masterclass in SaaS growth: solve a clear problem, listen to your customers, and never stop innovating. Their journey shows that even a simple idea can scale into something extraordinary with persistence and focus.

Metrics & Milestones

Here’s a snapshot of Kiwi Sizing’s growth:

• $36K MRR (2023).
• 13,000+ active stores, with 25% paying customers.
• 5% MoM revenue growth since launch.

Takeaways & Practical Tips

Kiwi Sizing’s journey offers valuable lessons for SaaS founders:

✅ Solve a niche problem: Identify a specific pain point and build a solution tailored to your audience.

✅ Engage directly with customers: Their feedback is the ultimate guide to product improvement.

✅ Focus on defensibility: Stay ahead of competitors by innovating and expanding your reach.

✅ Leverage free plans: Freemium models can drive early adoption and visibility.

✅ Automate strategically: Free up your time by automating repetitive tasks like support and marketing.

Kiwi Sizing’s story proves that even the simplest ideas can lead to extraordinary results when paired with persistence and customer focus.

Whether you’re just starting out or looking to scale, their success is a reminder that understanding your users and solving real problems is the key to sustainable SaaS growth.

The success stories of Shopify Apps don’t end there. Find out how the founders of SuperLemon built a $29K MRR in only 15 months.

Ready to take your SaaS to the next level? Start by listening to your customers—just like Sam did.