The data exists. The official portal is broken.
Portuguese drivers fill up 2-4 times a month, and prices can vary by €0.10/L on the same street. The official DGEG portal at `precoscombustiveis.dgeg.gov.pt` has every price, by law — every station must report changes within 24 hours under Decreto-Lei 117/2020. The portal works, technically. It just looks like 2009 and breaks on mobile.
Existing private aggregators are ad-heavy, slow, and miss the daily-utility features drivers actually want: distance sort from 'where I am', alerts when a station I care about drops below a price I picked, a clean mobile UI you can open in a car park at night.
The brief: ship a thin, fast, dark-by-default layer on top of the official data that makes the daily decision — 'where do I fill up' — answerable in five seconds.
