Having used it, BeReal sort've gets close to this, but in reality people are posting the entire day after that two-minute window and people can still react to your photos throughout the day.
Not everyone ends up posting within that two minute window and the only "punishment" for not doing so is that it just says they posted late.
BeReal is a great concept regardless, just pointing out the differences and the realities of it.
Most people I know are definitely not on top of their notifications like that. I'd be lucky if they respond to my texts within an hour. Even I who am on top of my notifications still somehow miss it sometimes, either because the phone was on the table or I just didn't feel the vibration.
That being said, I like it as a way to just journal a picture a day, even without any contacts in the app.
I like the idea that you need to contribute a post before you can see other peoples posts and some of the controls around having to post something in the moment instead of something curated.
Not everyone ends up posting within that two minute window and the only "punishment" for not doing so is that it just says they posted late.
BeReal is a great concept regardless, just pointing out the differences and the realities of it.