StratusOnline is the free online resource platform of Stratus Publishing, dedicated to aviation history, research, knowledge, and documentation. It brings together articles, photographs, color profiles, archives, searchable databases, and interactive features in Polish and English. Visitors can explore historical studies, biographies of notable aviators, aircraft histories, archival and contemporary photography, aircraft illustrations, museum listings, and photographic walk-around documentation. Modelers can find build articles, reviews, practical guides, an interactive FS and RAL color reference, and updates on kits, accessories, decals, and 3D prints.

The site also presents Stratus publications through book descriptions, sample spreads, illustrations, and a searchable catalog covering titles, series, authors, ISBNs, and publication years. Its digital archives include past magazines, books, reviews, and supplementary materials. Aviation databases offer searchable historical information, including aircraft records and serial numbers, museums, and monuments. Interactive aircraft development charts, daily aviation history entries, videos, and social media content extend the experience. StratusOnline connects enthusiasts and researchers with a broad collection of free resources, while directing readers to the publisher’s books and the Stratus shop.