The Sizing App for Online Shopping You’ve Been Waiting For: Meet Tellar

If you’ve ever abandoned an online shopping cart because you weren’t sure what size to pick, you’re not alone. Inconsistent sizing is one of the biggest frustrations in fashion e-commerce — and one of the top causes of returns. With the rise of remote shopping, the need for a reliable sizing app for online shopping has never been greater.

That’s where Tellar.co.uk steps in. It’s a free, web-based sizing tool designed specifically to help you find your perfect fit — across 1,500+ brands, instantly, without downloads, subscriptions, or guesswork. Think of it as your personal fit assistant, available anytime you shop.

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What Is a Sizing App for Online Shopping?

A sizing app is a digital tool that calculates and recommends your ideal size in a given brand or product, based on your body measurements or known sizing from another brand. These apps are designed to:

• Improve sizing accuracy

• Reduce returns and exchanges

• Enhance customer confidence while shopping online

Most sizing apps, however, are tied to specific retailers or require users to download an app, sign up, or scan their bodies. Tellar breaks that mold.

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Tellar: A Smarter, Simpler Sizing App

Tellar.co.uk functions like a sizing app — but works fully inside your browser. It doesn’t require any downloads or plugins and can be used across your laptop, phone, or tablet. It helps you determine your best-fitting size across a vast database of brands — from ASOS to Reiss to Nike — instantly.

Unlike retailer-based tools, Tellar isn’t restricted to a single shop. It’s platform-agnostic and user-centric, meaning it’s built around your needs, not just the retailer’s convenience.

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How Tellar Works

You can use Tellar in two equally easy ways:

1. Use Your Measurements

Know your chest, waist, and hip measurements? Enter them into the Tellar calculator and choose whether you're using centimeters or inches.

Within seconds, you’ll get:

• Your recommended size in a specific brand

• An explanation of how the brand fits (small, large, or true to size)

• A visual size chart for context

This is perfect if you’re shopping across unfamiliar brands and want a data-backed recommendation.

2. Use a Size You Already Know

Not sure about your measurements? No problem. Just enter a brand you already own and the size that fits you well — for example, a size 10 in H&M. Tellar will then estimate your measurements based on that brand’s size profile and tell you what size to buy in the new brand you're browsing.

This is incredibly helpful if you’re buying from a brand for the first time and want to match your known fit.

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Why Tellar Is Better Than Other Sizing Tools

There are plenty of size calculators and apps out there, but most fall short for a few reasons:

Tellar’s flexibility and brand coverage make it ideal for anyone who shops across multiple websites — ASOS today, Uniqlo tomorrow, and maybe COS or Reiss next week.

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The Problem It Solves

In the UK alone, over 40% of fashion items bought online are returned — and sizing issues are the #1 reason. That’s a problem for shoppers and retailers alike:

• Shoppers waste time, money, and confidence

• Retailers lose revenue and suffer high return costs

• The planet absorbs the carbon footprint of unnecessary shipping

Tellar helps eliminate that problem by giving you a better fit from the very first click.

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Key Features of Tellar's Sizing App

• ✅ Free to Use: No cost, no account required unless you want to save your profile

• ✅ 1500+ Brands: Everything from high street to premium and activewear

• ✅ Smart Matching: Uses real-time data to adjust for brands that run large or small

• ✅ Dual Input Modes: Measurements OR known sizes

• ✅ Mobile-Friendly: Works beautifully on phones and tablets

• ✅ Data-Driven: Constantly improving through customer insights and sizing metadata

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Real-World Use Case: Emma’s Experience

Let’s say Emma usually shops at Zara and wears a size S in their jumpers. She’s now shopping at COS and isn’t sure if she needs an S or M.

Instead of scrolling through confusing size charts or reading random forum comments, she:

1. Goes to https://tellar.co.uk/store-size-lookup

2. Selects “I know my size in a store”

3. Enters Zara, size S

4. Selects COS from the dropdown

5. Instantly sees that her best size in COS is likely an M, since COS cuts slimmer than Zara.

No guessing. No over-ordering. Just confidence.

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The Tech Behind the Tool

Tellar is powered by a clean mix of:

• SQL databases mapping standardized sizing across brands

• PHP and JavaScript logic that matches input to the closest fitting size

• Real-time brand metadata that reflects real-world feedback on fit behaviour (e.g. “runs large”)

This allows for:

• Live matching even for first-time brands

• Smart unit conversion (inches ⇄ cm)

• Accurate fallback logic if certain size data is missing

Future iterations will include:

• Chrome extension that overlays size recommendations directly onto supported websites

• Fit preference adjustments (tight, relaxed, oversized)

• Profile syncing across devices

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Why Brands Should Care

Retailers stand to benefit massively from solutions like Tellar. Lower return rates, higher customer satisfaction, and smarter analytics around how people shop and fit into clothes can drive long-term gains.

Brands that integrate sizing APIs or partner with tools like Tellar can:

• Improve conversion rates

• Boost average order value

• Cut reverse logistics costs

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Final Thoughts

Online shopping isn’t going away. But sizing confusion should.

With tools like Tellar, finding your perfect fit is no longer a guessing game. Whether you’re a fashion enthusiast, casual shopper, or someone who hates the hassle of returns, this is the sizing app for online shopping you’ve been waiting for.

Try it now — and make your next online order your best-fitting one yet.

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👗 Use the Free Sizing App Now at Tellar.co.uk