Ad Orientem is a global directory dedicated to the Traditional Latin Mass, helping people discover where it is offered and supporting the preservation of its tradition. Its central feature is a searchable Mass finder, where visitors can look by city, church, diocese, or country, use their location, or explore an interactive world map. Listings identify churches and chapels around the world, along with the communities or clergy responsible for them, including diocesan clergy and groups such as the FSSP, SSPX, and ICKSP. The directory also includes planned and suspended locations, giving users a broader view of the worldwide Mass landscape.

Alongside its location tools, Ad Orientem provides information about the traditional liturgical calendar. Visitors can view the day’s observance, season, liturgical color, commemorations, and Mass propers, with references to the 1962 Roman Missal. The site also offers chant resources, including proper chants, the Graduale Romanum, the Kyriale Romanum, and Marian antiphons.