Three software-only tools that turn everyday footprints into numbers you can act on. No sensors, no integrations, no excuses: each one is buildable in a single hackathon day.
WattWiseReWearGreenPlate
Press ↓ or space to present
The idea behind all three
Same move, three domains.
A bill, a wardrobe, a plate: each hides its footprint, and what stays invisible never changes. Each tool reveals one honest number, then hands the user one action worth taking.
EnergyWattWiseyour electricity bill, itemized appliance by appliance
ClothesReWearyour wardrobe, back in circulation through local swaps
FoodGreenPlateyour plate, scored A to E before you eat it
01 · Energy
WattWise
Your electricity bill, finally itemized. One number in euros becomes three actions worth taking.
WattWise · The solution
Reads the meter you already have.
Millions of European homes carry smart meters that record consumption every 15 to 30 minutes. WattWise turns that dormant data into advice, with zero new hardware.
01Disaggregates the profile. The fridge's steady cycle, the water heater's sharp spikes, the AC's afternoon plateau: each appliance leaves a signature WattWise can name.
02Shows where the kWh actually go. A breakdown replaces the single mystery total.
03Ranks tips by euro impact. "Your water heater is 31% of your bill; a timer switch saves about €95 a year." Specific beats guilt.
04Answers "what if" before you commit. Toggle a tip and watch the bill redraw itself.
Appliance-level feedback cuts household use by about 12%, roughly three times what monthly bills achieve (Armel et al., Energy Policy, 2013). Demo runs on bundled 7-day sample households with transparent rules; no live meter needed.
Where your kWh go · week 24
Water heater31%
Fridge18%
Aircon16%
Washer9%
Everything else26%
Top tip · saves ≈ €95/yrPut the water heater on a timer switch.
Bill with tip applied:€78→€64
02 · Clothes
ReWear
The most sustainable wardrobe is the one already hanging in your closet.
ReWear · The solution
Swapping, made easier than shopping.
A digital wardrobe plus a local swap network. Garments stop being clutter and start being currency, with the environmental savings counted out loud.
01Catalogue what you don't wear. Type, material, size, condition; each item shows the footprint it carries. One cotton tee is about 2,700 litres of water.
02Wishes meet offers. "Maria wants a denim jacket, size M. Elena listed one, 1.2 km away."
03Matches become swap parties. The app bundles matched pairs into events at youth centres: a place, a date, a reason to come.
04Every swap counts. Water and CO2 kept in use accumulate on a visible impact counter.
EU citizens discard roughly 11 to 12 kg of textiles a year and under 1% of clothing is recycled into new garments. Demo runs on a built-in footprint table and mock listings; builders can seed it live with their own wardrobes.
Your wardrobe · 7 items listed
Denim jacket
Size M · good condition · listed 2 days ago
keeps 3,800 L of water in use
New matchElena wants a denim jacket (M) · 1.2 km awayNext swap party: Sat 17:00, Larnaca Youth Centre
11,400 Lwater kept in use23 kgCO2e avoided9swaps completed
03 · Food
GreenPlate
A Nutri-Score for the planet, computed before you eat.
GreenPlate · The solution
One plate. One score. One swap.
Food drives roughly a quarter of a European household's footprint, yet no one can see a meal's impact at the moment of choosing. GreenPlate closes that loop in seconds.
01Build the plate. Pick ingredients and portions from a built-in database of about 30 staples; CO2 and water totals appear instantly.
02Read the grade. A to E, colour-coded. One glance is enough, no spreadsheet required.
03Take the one swap. Not a lecture: "half the beef to lentils cuts CO2 by 62%," with seasonal suggestions that switch between Larnaca, Budapest, and Kaunas.
04Watch the habit form. A weekly trend turns single meals into progress: your average plate moved from D to B.
The EU wastes about 59 million tonnes of food a year, roughly 132 kg per person. Footprint values and swap rules ship inside the app as lookup tables; the country toggle is the built-in transnational angle.
Tonight's plate · beef souvlaki
E
as built
B
with swap
Beef, 150 g9.0 kg CO2e
Pita and vegetables0.8 kg CO2e
Yogurt sauce0.5 kg CO2e
Suggested swap · in season in CyprusHalf the beef → lentils: −62% CO2e, −710 L water
Your week so far: D → C → B
Why these three
Built for one day. Aimed at every day.
Three domains, one design principle: reveal the number, hand over the action. Each demo stands on mock data and lookup tables, so the whole pitch works without a single external dependency.
WattWise
ReWear
GreenPlate
Reveals
which appliances drive the bill
the water and CO2 inside each garment
a meal's footprint, graded A to E
Hands you
three tips ranked by euro savings
a local swap match and an event
one swap with the % improvement
Demo moment
toggle a tip, watch the bill redraw
list a real garment, match it live
beef plate E becomes lentil plate B
SDGs
7 · 12 · 13
12 · 6 · 13
12 · 13 · 2
Software onlyNo hardwareNo external dataDemoable in one day
