Periplus

Periplus is an AI-powered learning platform that transforms any topic, question, or PDF into structured educational content with interconnected explanations, assessments, and study tools. Connected exploration lets users open documents side by side and follow a knowledge graph to see how ideas connect, while course generation creates structured, hierarchically organized learning paths. A personal library keeps everything a user explores organized for later reference, and spaced repetition automatically turns any document into quizzes and flashcards to reinforce retention. Interactive learning support includes maps, mathematics, and visual elements. Pricing spans a free Basic tier (core features, no PDF support) and Premium at $14/month or $168/year (26% annual discount), which adds full PDF access and unlimited course creation.