Does one published app on starter plan mean that I can launch 1 mobile app for both android and ios at the same time.???
Yep, you’ll be able to have the app in both app stores alongside a PWA for web browsers with 1 “published app”
Hello, as @diegozane has mentioned, one published app can be published to Google Play, App store and PWA (Progressive Web App).
Thank you!
Ok thanks… One more thing!
My app has a map and location pin for easy navigation, now I’m planning to upgrade to starter but I’m seeing “Geolocation” on Professional pack. Does it mean that my map will not work on the starter pack?
I would recommend launching your app and finding out, that’s how I figured out a lot of the possibilities and limitations 
That means it’s a no!