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Allergy Check
Configurable ingredient-risk detection for online shopping
A browser extension built for a direct, medically relevant shopping problem.
This started with an ordinary shopping trip and a non-ordinary allergy. Palm oil sits outside familiar packaging warnings, so every product meant reading the full ingredient list and wondering whether an alias had been missed.
What I walked intoThe setupProblem context
Standard allergen labels do not cover every ingredient risk, so full lists had to be checked repeatedly.
How I untangled itThe turning pointTechnical approach
The extension checks configurable terms and aliases, then shows SAFE or AVOID with the exact match and inspected source text.
What changedWhere it landedResult
A transparent rule engine that explains what it found instead of returning an unexplained warning.
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