Suhoor End Time

Salam aleykum everyone!

I hope this Ramadan has been going well for you all. I was wondering, what time do you all start your fast? Is it on the time of Fajr on the prayer apps? I’m based in the US, but grew up in a household where my parents believe we must start our fast at least 10 minutes before Fajr time, but many people I know end at the time of the Fajr athan.

Thank you all!