Sinai.ai

Sinai.ai is an AI-native reading platform turning books into interactive, multimodal experiences through its trademarked aiBook format. Readers can converse with the text, generate study guides and quizzes, translate into dozens of languages, and switch between reading and listening - all on fully licensed publisher content. Founded in 2024 and headquartered in San Francisco, the company closed a $1.45M pre-seed round in April 2026.