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● In useChrome extension

FitCheck

A calculator, not a guess. It reads the size chart already on the page and works out whether the size will actually fit.

Add to Chrome ↗ Try it live, no install ↗ GitHub ↗

Chrome, Edge, Brave or any Chromium browser. The side panel it runs in does not exist in Firefox or Safari.

ProblemA quarter to a third of clothing orders in India come back, and size is the biggest reason. Each return costs shipping both ways, handling, and often a garment that can’t be resold. The chart that would prevent it is already on the page, unread.
DecisionA calculator, not a guess. It compares the fit a garment was designed for with the fit you’d actually get. The chart is already exact, so arithmetic is the right tool.
EvidenceTen installs. 70% were still using it a week later. Nobody uninstalled it. And it refuses to answer when the size chart is missing or unreadable — six times in twenty-one, where it says so instead of guessing.
OutcomeIt caught a sizing mistake of mine that had already cost a return and an exchange. Every verdict can be checked against the store’s own chart.

The Label Said 30. So Did My Waist.

I ordered Levi’s jeans in size 30. My waist is 30 inches. They arrived too loose, and I exchanged them for a 28.

Then I read the size chart on the page I had just bought from. On that cut, a 28 is made for a 30-inch waist. The label was never a measurement. It was a name — and it had been sitting two scrolls down the whole time I was ordering the wrong thing.

That week I had Myntra, AJIO, H&M and Westside open at once. The same letter meant four different bodies. Every page already had its chart. So the chart was never the problem. Trusting it was.

The FitCheck side panel on a Myntra jeans page: verdict "34, loose at waist", a red "Not recommended" chip, a tinted silhouette pinned "Hip loose by 4.0 inches", the per-axis reasoning, and a size selector marking 30 as the recommendation.
A size it turns down, with the axis that fails and where to go instead.
The FitCheck side panel: verdict "L, slightly long", an amber "May work for you" chip, a callout reading "You previously bought size M. The fit math now recommends L", a tinted silhouette with per-axis pins, and the reasoning for each axis.
Live on Myntra. It disagrees with your last purchase, and says why.
The FitCheck panel on the AJIO Levi’s jeans page recommending size 28, with the waist marked on target and a green silhouette.
FitCheck picking 28 on the live product page.
AJIO order history showing the same Levi’s jeans delivered in size 28, marked as an exchange order.
And the order it replaced. A 30, exchanged for a 28.

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