Scan a clothing tag and see its estimated water and carbon footprint
Beginner8h1–2
Tesseract.jsNext.js
17/20Receipt Carbon Estimator
Shows the carbon impact of everyday purchases.
Intermediate36h2–3 people16/20 fit
Build Receipt Carbon Estimator for conscious shoppers in ~36h with 2–3 people. Stack: Next.js + OCR + LLM.
Why it wins: Tangible impact story with visual results.
Build flow
01 · Problem
People buy things every day but have no idea about the carbon cost.
02 · Solution
Upload a receipt. Estimate the carbon and suggest lower-impact alternatives.
03 · Build
- 1OCR receipt items
- 2Map items to emission factors
- 3LLM suggests swaps
- 4Results card
04 · Demo
Upload one receipt → show carbon number + one alternative suggestion.
MVP checklist
- Receipt upload
- Item-level CO₂
- Greener swaps
- Monthly total
Tech stack
| Tech | Role | |
|---|---|---|
| Next.js | Frontend + API routes | Web |
| OCR | Text from images | AI |
| LLM | Language model | AI |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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Beginner8h1–2Tesseract.jsNext.jsCharts17/20Climate
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Intermediate24h1–3ReactFirebaseChart.js16/20