Antiparos sits just off the west coast of Paros, so close that the hop between them feels more like a commute than a voyage. People staying on Antiparos cross over to catch a bigger ferry, pick up a rental car or spend an evening on Paros, and day-trippers based on Paros make the same trip in the opposite direction.
The two ends are very different places. Antiparos town is the island's main and only town, small and easy to walk, with its harbour at the bottom of the village. Paros is the bigger, busier island. Its main port, Parikia, puts you right beside the old town and the Panagia Ekatontapyliani church, while Pounta is the car ferry landing on the west coast, a drive away from Parikia.
That difference shapes your plan. If you have a car or scooter, the Pounta car ferry is the obvious choice. If you want to step off right in Parikia for the old town, the bus station or an onward ferry across the Cyclades, look at the boats that run from Parikia instead, which our port notes confirm also operate on this crossing. We do not hold times or fares for them, so check the booking page.
This is a cheap and short crossing, but it still pays to plan around it. Leave generous margin if the hop feeds a same-day connection from Parikia, and in summer allow for the fact that the car ferry can fill up. Our port notes suggest reaching the car ferry 20 to 30 minutes before the sailing you want.