"We asked ourselves what do people always talk about - the weather and the price of gas."
The app would not exist unless people contributed to it - "there's no money in it for anyone, you just add to it to be a part of the community you live in".
Rising petrol prices were a "massive problem and a huge part of a weekly household spend", Mr Green said.
He said it was nonsensical that there was 20-30 cents difference between petrol stations a kilometre from each other.
"How consumers choose will put pressure on Big Oil - a generic term for oil companies. It tells them we want competitive petrol prices. The best way to create change is through consumer patterns."
Gaspy also had a fun side to it, with a gaming aspect where people could compete with other users in the "carmunity".
People could win fuel vouchers for updating, confirming and sharing prices on the app.
At the end of January AA called for fuel companies to explain why the national price of fuel rose 5c per litre during January despite no increase in commodity prices or a drop in the exchange rate.
AA spokesman Mark Stockdale said the rise in costs was unusual as normally retail prices rise following an increase in the cost of importing fuel, but that was not the case in January.
Energy Minister Judith Collins soon after signalled there would be an announcement next week about an inquiry into rising petrol margins.
At the time she said ensuring a competitive market was the best way to keep fuel costs down. Mrs Collins was discussing it with the Ministry of Business, Innovation and Employment.
Gaspy
- free to download
- users share and confirm fuel prices to keep data updated and correct
- download from Google play store
