I co-founded Urban Guides app dev startup. Our first test on product/market fit was the Budapest Urban Guide tourist iOS & Android apps in 2011/12. (After several iterations came the second app SmartShopper.)
You can download the iOS & Android app via www.budapesturbanguide.com.
I dealt with the business / product development,
partly with the UI/UX / information architecture / visual design and content creation.
Co-founder partner - Balázs Varga
Back-end - Krisztián Kaizer
Android app dev - Sicz-Mesziár János
iOS app dev - Róbert Koltai
iOS app dev - Róbert Koltai
Content - László Láng
Logo / some parts of the graphic design - Bettina Tigyi