Compare running cost and emissions of your current system with an efficient one
Beginner8h1–2
Next.jsCharts
17/20Appliance Energy Label Comparator
Photograph energy labels in a store and compare lifetime running costs.
Beginner8h1–2 people17/20 fit
Build Appliance Energy Label Comparator for shoppers buying appliances in ~8h with 1–2 people. Stack: Tesseract.js + Next.js + Charts.
Why it wins: In-store use case that turns a label into money.
Build flow
01 · Problem
Star ratings hide the real difference in running cost over ten years.
02 · Solution
OCR the label, extract annual consumption and compute lifetime cost and CO2 for each model with the user's tariff.
03 · Build
- 1OCR the label
- 2Parse consumption
- 3Compute lifetime cost
- 4Chart the comparison
04 · Demo
Scan two fridge labels and show the ten-year cost difference.
MVP checklist
- Label OCR
- Lifetime cost
- CO2 comparison
- Saved comparisons
Tech stack
| Tech | Role | |
|---|---|---|
| Tesseract.js | OCR in the browser | AI |
| Next.js | Frontend + API routes | Web |
| Charts | Data visualisation | UI |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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