A Submission for the DEV Hacktoberfest 2026 Weekend Challenge: Build for a Friend
My roommate and close friend Elena has severe Celiac Disease (Gluten-Free) alongside an anaphylactic Tree Nut allergy and lactose sensitivity.
Living with severe food allergies turns daily activities into emotional minefields:
- Grocery shopping means standing in crowded supermarket aisles squinting at tiny font labels, decoding obscure biochemical derivative names ("malted barley extract", "hydrolyzed wheat protein", "sodium caseinate", "praline").
- Eating out or cooking together with roommates requires constant anxiety about cross-contamination and shared cookware.
- Most grocery store basements and underground subways have zero cellular reception, making cloud-dependent AI tools completely useless.
- Elena didn't want to upload her private medical vulnerabilities to cloud servers that track consumer behavioral profiles.
PlateMate is built specifically for her: an open-source, client-side intelligent ingredient analyzer and recipe safe-swapper that runs 100% locally in the browser with zero cloud server, zero tracking, and zero API costs.
- 🔍 Local AI Ingredient Inspector: Paste any ingredient label or menu description. The local NLP parser decomposes ingredients against known biochemical synonyms and hidden covert derivatives.
- ⚡ Instant Safety Verdict & Radar: Calculates an objective Safety Score (0-100%) with categorized hazard tags (
DIRECT,COVERT,CROSS-CONTAMINATION). - 🍲 Safe Recipe Transformer: Adapts classic roommate meals (Fettuccine Alfredo, Genovese Pesto, Fudgy Brownies, Chicken Satay) into 100% allergy-safe equivalents with precise 1:1 culinary substitutions.
- 🌍 Multilingual Chef Alert Cards: Generates printable and savable restaurant cards in 8 languages (English, Spanish, Italian, French, Japanese, German, Hindi) that Elena can present to restaurant servers or chefs when traveling.
- 🔒 100% Offline & Private: Powered by client-side Transformers.js and WebAssembly. No health data ever leaves your device. Works seamlessly on airplane mode.
- Aisles Have No Internet: Closed commercial APIs (OpenAI, Claude) fail the moment you walk into a grocery store basement or rural market. Open-weight in-browser inference guarantees instant access anywhere.
- Zero Health Surveillance: Food allergies and dietary restrictions are sensitive personal health information. PlateMate runs inside the client sandbox—no tracking, no telemetry, no corporate monetisation.
- Permanent Free Utility: Chronic illness and allergy-friendly foods already carry a hefty financial premium. Open-source local inference ensures safety tools cost $0.00 forever.
- Verifiable & Deterministic Safety: In allergy care, hallucinations can cause anaphylaxis. Open-source code allows public auditing, transparency, and deterministic safeguards.
PlateMate requires no build step, no npm install, and no environment keys.
Simply open index.html in any modern web browser!
# Python 3
python3 -m http.server 8080
# Or Node.js
npx serve .Navigate to http://localhost:8080.
- Core: Vanilla HTML5, CSS3, JavaScript (ES6+)
- Open AI Inference: Transformers.js / ONNX Runtime WebAssembly & Biochemical Allergen Ontology
- Typography: Google Fonts (Plus Jakarta Sans & JetBrains Mono)
- License: Apache 2.0 (Open Source)
Built with ❤️ for Elena for Hacktoberfest 2026.
