@wisteria, actually there’s a lot of cross applications to Brown, Hamilton and Wesleyan given open curriculum, academic profile, vibe, demographics. While only 2 kids opinions, DD’s felt Vassar had a different vibe than others due to male/female ratio.
That said, as the OP asked “I’m interested in Brown and was wondering if anyone could suggest similar schools. I like the open curriculum, size, and the “Brown bubble” while it’s still in a city.”, I’m not certain that there is a great match as few are in a city location as cool as East Providence has become; maybe Tufts, but it doesn’t have the same campus feel and isn’t an open curriculum.