Comment by steiger

I will generalize and answer about all main technologies involved:

1. Hot Apps Nearby uses Firebase as a Backend,

2. Kotlin & Android Studio 3 (Native Android App),

3. Github Pages for the landing page (http://hotappsnearby.download), tracking pixels with Facebook and events with Analytics to optimize advertising

4. Namecheap for buying the domain.

5. Adwords, Facebook Ads.