LongCut

LongCut turns long-form YouTube videos into a structured learning workspace. Paste a URL and the app generates highlight reels, timestamped AI answers, and a place to capture your own notes so you can absorb an hour-long video in minutes.

AI highlight reels with Smart (quality) and Fast (speed) generation modes, Play All playback, and theme-based re-generation. AI-powered quick preview, structured summary, suggested questions, and memorable quotes surfaced in parallel. AI chat grounded in the transcript with structured JSON responses, timestamp citations, and fallbacks when the provider rate-limits. Transcript viewer that stays in sync with the YouTube player; click any sentence to jump or capture the quote. Personal notes workspace with transcript, chat, and takeaway sources plus an /all-notes dashboard for cross-video review. Authenticated library pages for saved analyses, favorites, generation limits, and Supabase-backed profile preferences. Aggressive caching of previous analyses, background refresh tasks, and rate limits for anonymous vs. signed-in users. Security middleware that enforces CSP headers, CSRF protection, body-size caps, and Supabase-backed rate limiting.