Granite compatibility is not explicitly stated, and product chemistry is not established in the evidence.
Why
Windex Original is identified as a hard-surface cleaner, and ordinary use on finished granite is generally reasonably compatible, but the evidence does not verify the finish or chemistry.
What to do
Use only as directed on the label; test first in an inconspicuous area and wipe/rinse residue promptly. Avoid use on unsealed or damaged granite.
pH
Not stated in the provided evidence.
Relevant chemistry
The provided evidence identifies it as a hard-surface cleaner but does not establish pH or specific chemistry classes.
Source: official product page ↗