What Each One Actually Is
A screened porch is a structural addition to your house. It has a framed roof (usually tied into your home's roofline), framed walls or knee walls, and fixed screen panels. It is built by a contractor, sits on a foundation or an existing porch slab, and in most jurisdictions it is treated like any other addition: plans, permits, inspections, and sometimes HOA review. Requirements vary by city and county, so check local rules before you price one.
A bare pergola is an open shade structure: posts and a roof of fixed or adjustable slats, no walls, no screens. It filters sun and defines the space, and that is the whole job. Rain comes through unless the roof is solid or the louvers close, and there is nothing between you and the insects.
An Atlas louvered pergola in graphite and white, installed in Tierra Santa, San Diego, CA.
A screened-in pergola combines a louvered roof pergola with retractable motorized screens on the open sides. With the Atlas louvered roof by Apollo, the aluminum louvers rotate by remote, app, or wall switch: open for sun and airflow, closed to shed rain through a built-in gutter with engineered drainage designed to your specific installation. Add Apollo's motorized screens on the sides and the same structure converts from an open-air patio to a screened room in seconds, then back again.
That last part matters because Apollo manufactures both halves. The roof and Apollo's motorized screens are made by the same company, sized to the same structure, installed by the same dealer, and covered together rather than bolted on from two different brands.