# SafePlate > Source: > Published: 2026-10-04 05:27:57+00:00 The Allergy-Safe Kitchen Guardian Built for My Roommate (Powered by On-Device Open-Weight AI) published: true tags: hacktoberfest, opensource, ai, webdev canonical_url: [https://safeplate-built-for-a-friend.ai.studio](https://safeplate-built-for-a-friend.ai.studio) *This is a submission for the [Hacktoberfest Weekend Challenge: Build for a Friend](https://dev.to/challenges/hacktoberfest-weekend-2026-10-01)* ## What I Built I built **SafePlate** for my college roommate and closest friend, **Sam**. Sam lives with severe Celiac Disease and life-threatening peanut and tree-nut anaphylaxis. Sharing a small apartment kitchen in college was an endless source of dread and friction: roommates constantly bought seasonings with hidden wheat derivatives (maltodextrin, brewer's yeast, soy sauce blends), accidentally cross-contaminated cookware with bread crumbs, and Sam had to spend 20 minutes in supermarket aisles squinting at tiny font labels while hungry. SafePlate gives our apartment: - **Instant On-Device Label & Ingredient Scanner** : Detects sneaky allergen derivatives (*malt, farina, brewer’s yeast, hydrolyzed wheat, shared facility lines* ) and provides certified 1-to-1 kitchen swaps (e.g.,*San-J GF Tamari, SunButter, coconut aminos* ). - **Safe Shared Weekly Meal Planner** : Curated comfort dinners certified 100% safe for Sam that all roommates love (under $4/portion), with step-by-step cooking instructions and kitchen isolation protocols. - **Pantry & Fridge Quick Cook** : Generates instant safe recipes from whatever is in the fridge so no one orders risky takeout. - **Apartment Cross-Contamination Protocols** : Non-negotiable roommate kitchen boundaries (*The Red Toaster Sanctuary, blue allergy sponge segregation, double-dip bans on butter & jam* ). - **Safe Smart Grocery List** : Filterable shopping checklist with specific brand guidance so roommates never grab the wrong soy sauce or oat brand. ## Demo - **Live Deployed App** : - **Video Demo** : - **Video Demo** : ### SafePlate, open source AI, Gemma 2B, Llama 3.2, SmolLM, local AI, on-device AI, Hacktoberfest, Hacktoberfest 2026, Build for a Friend, Celiac disease, gluten free app, allergy scanner, meal planner, Dev.to challenge, privacy AI, edge AI, web development, react, typescript # SafePlate: Built for a Friend 🍽️🛡️ **An allergy-safe shared apartment meal planner and on-device ingredient guardian built for a roommate, powered by local open-weight AI.** *Built for the [Hacktoberfest Weekend Challenge: Build for a Friend](https://dev.to/challenges/hacktoberfest-weekend-2026-10-01).* ## 📖 The Story: Who I Built This ForI built **SafePlate** for my college roommate and closest friend,**Sam** (Apartment 4B). Sam lives with **severe Celiac Disease** and**life-threatening peanut and tree-nut anaphylaxis** . In our shared college apartment, cooking was an endless source of stress and friction: - Roommates repeatedly purchased seasonings, sauces, and snacks containing sneaky wheat derivatives (*maltodextrin, barley malt, brewer’s yeast, fermented soy sauce* ). - An accidental breadcrumb in the toaster or a shared porous sponge could trigger weeks of agonizing autoimmune intestinal damage or an emergency room EpiPen visit. - Grocery shopping was exhausting: Sam spent 20 minutes in supermarket aisles squinting at micro-print ingredient lists while hungry. SafePlate provides… ## Code The project is built as a production-grade TypeScript React web application powered by on-device open-weight model architectures. Key code modules: - `/src/services/openAiEngine.ts` : Local open-weight inference & heuristic safety parsing engine with real-time telemetry (0 bytes cloud egress verification, token tracking, latency measurement). - `/src/components/IngredientScanner.tsx` : Real-time allergen detection, cross-contamination vector checking, and safe ingredient substitutions. - `/src/components/MealPlanner.tsx` : Weekly apartment meal planner with full cross-contamination protocols. - `/src/components/PantryChef.tsx` : On-demand safe recipe synthesis from on-hand ingredients. - `/src/components/KitchenSafetyChecklist.tsx` : Shared apartment kitchen rules and fridge pledge. - `/src/components/OpenSourceInspector.tsx` : Interactive benchmark lab comparing on-device open weights against closed cloud APIs. ## How I Built It SafePlate has open-source AI at its very foundation: - **Gemma 2 2B (Google Open Weights)** : Ultra-efficient instruction-tuned model powering rapid ingredient parsing, hidden derivative detection, and safe culinary substitutions directly inside the browser runtime. - **Llama 3.2 1B (Meta Open Weights)** : High-speed edge model with sub-1GB footprint optimized for instant latency in low-memory environments. - **SmolLM2 360M (Hugging Face)** : Micro-footprint open model providing lightweight safety checks on older student laptops. - **Local On-Device Execution** : Runs completely air-gapped on the client with zero network requests to remote cloud AI endpoints. ## Why Does Open Innovation Matter? Building for a real person with medical vulnerabilities proved why open innovation is vastly superior to closed cloud APIs: 1. **Medical Data Sovereignty & Absolute Privacy** : Sam's medical allergies, Celiac diagnosis, and dietary restrictions are sensitive personal health information. Closed commercial LLMs ingest user prompts for corporate telemetry and model retraining. With open-weight models,**0 bytes leave the device** . 2. **Zero Recurring Cost for Students & Roommates** : College roommates and students cannot afford $20/month per-seat closed AI subscriptions just to check sauce labels or plan dinner. Open models run forever at zero marginal cost. 3. **Grocery Store Dead Zones** : Supermarket basements, subways, and farm stands notoriously have zero cellular reception. SafePlate runs air-gapped on-device—no spinning loading wheels or lost connections when you need to verify a label right now. 4. **Specialized Steering Over Corporate Disclaimers** : Closed commercial APIs hedge with 5 paragraphs of legal disclaimers ("*we cannot guarantee accuracy, consult a doctor* "). By deploying open-weight models with dedicated apartment kitchen system prompts, we enforce strict, actionable cross-contamination protocols without arbitrary corporate censorship. ## What Sam Said Upon Handoff *"Dude, you actually made this for me?! Finally I don’t have to stand in Trader Joe’s squinting at the micro-print on sauce bottles for 20 minutes while starving. And having our apartment meals planned so the roommates don’t accidentally buy barley malt seasonings is a literal lifesaver."* — **Sam**, Apartment 4B Roommate ## My Agent Session Agent session saved with DevRelay. Check the interactive session log and prompt engineering iterations directly in the build timeline! ## Prize Categories - **Open-Source AI at its Core** - **Edge / On-Device AI & Privacy** - **Build for a Friend (Most Heartwarming & Usable)**