Sac4kids is an iPhone application developed by USA4Kids LLC. It is a free online resource guide designed for families with kids in the Greater Sacramento area. The app aims to provide easy access to a variety of resources and activities for children in the region.

Users can explore a wide range of features including Events, Things To Do, Schools & Kids Activities, Arts, Music, Birthday Parties, Summer Camps, Child Care, Classes, Deals & Discounts, Field Trips, Health Providers, Kids Eat Free venues, Places To Go, Sports, and resources for Special Needs children. Sac4kids is a comprehensive platform that caters to the diverse needs of families with kids in the Sacramento area.