New answers tagged deixis
The 2 are NOT interchangeable. Acá is used for near situations that use verbs of motion Example: Juan, ven acá (Juan, come here). Aquí is used for other near situations. Example: Puedes registrarte aquí (You can sign up here). For describing "less near" things, use allí. Example: El hombre allí no habla ingles (The guy over there doesn't speak English). ...
In the North of Mexico we always say "aquí" even when we say "ven aqui" and we also use "allá" instead of "allí" but in the south of Mexico and most of south America "acá" is used. What is correct depends on where you are. By the way I'm in Monterrey very close to the US
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