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Video speed controller + AI course notes from subtitles, chapters & timestamps. Udemy, Coursera, LinkedIn, Skillshare. 5 free/mo. CourseSpeed is a video speed controller built for online course students on Udemy, Coursera, LinkedIn Learning, and Skillshare. Control playback speed from 0.25x to 4x, generate AI study notes from subtitles or lecture audio, track learning progress, and bookmark key moments — all in one free Chrome extension. No sign-up required. 🎮 Video Speed Controller (0.25x–4.0x) Unlike generic speed controllers that lose your settings on refresh, CourseSpeed remembers your preferred speed and restores it automatically — even when switching lectures within a course (SPA navigation). Full keyboard control: • Shift+, / Shift+. — decrease / increase speed • ← → — skip 5 seconds (customizable on Premium) • Shift+H — toggle control bar visibility • Shift+B — bookmark current moment • Shift+/ — toggle between 1x and your last speed All shortcuts work out of the box and persist across browser restarts. ⚡ AI Subtitle Summary (One-Click) The fastest way to turn any lecture into structured study notes. Click the 📝 button on the video control bar — CourseSpeed reads the full lecture subtitles, sends them to AI, and returns organized notes with chapter headings and timestamps. Click any timestamp to jump straight to that moment in the video. • Full transcript captured in seconds — no need to watch the whole lecture • Chapters & timestamps generated automatically • Works on Udemy, Coursera, LinkedIn Learning & Skillshare • Subtitles are processed in memory only — never stored, never cached 🎙️ AI Study Notes (Audio Recording) For videos without subtitles, record lecture audio directly in the side panel. Audio is transcribed via speech-to-text, then processed into structured study notes with section headings. View all notes in a full-page reader. Works with DRM-protected content on Udemy, Coursera, LinkedIn Learning, and Skillshare. 📊 Learning Dashboard Track total watch time, time saved by speed listening, and session count. Free users get a 7-day free trial of the complete dashboard with unlimited AI notes. After the trial, upgrade anytime to unlock lifetime access, weekly watch time, learning streaks, total hours saved, weekly goal progress, and CSV export. 🔖 Bookmarks Save your spot with one click (Shift+B). View all bookmarks with timestamps. Jump back to any moment instantly. Free users: up to 3 bookmarks. Premium: unlimited. 📚 Supported Platforms Udemy | Coursera | LinkedIn Learning | Skillshare 💰 Free vs Premium 表格 | Feature | Free | Premium | | --- | --- | --- | | Speed Control (0.25x–4x) | ✅ Unlimited | ✅ Unlimited | | Speed Memory (persist across sessions) | ✅ | ✅ | | Keyboard Shortcuts | ✅ All | ✅ All | | AI Subtitle Summary | 5/month | Unlimited | | AI Study Notes (audio recording) | 5/month | Unlimited | | Timestamp Bookmarks | 3 total | Unlimited | | Learning Dashboard | 7-day free trial | Lifetime access | | Custom Skip Durations | 5s only | Any value | | CSV Data Export | — | ✅ | | Weekly Learning Goals | — | ✅ | Premium: $4.99/month or $39.99/year (save 33% — just $0.11/day) 🛡️ Privacy • Bookmarks, notes, and learning stats are stored locally on your device • No sign-up required for core features • No analytics, no tracking, no ads, no "browser history" permission • AI Notes audio is sent to our server solely for transcription, immediately discarded after processing — no audio is stored • Subtitle text is processed in memory only and released immediately after the summary is generated — never cached or saved ❓ FAQ Q: Is this different from YouTube summarizers? A: Yes. YouTube AI tools cannot access DRM-protected course content on Udemy, Coursera, or LinkedIn Learning. CourseSpeed can — because it captures audio locally while you watch, then transcribes. For subtitled lectures, it reads subtitles directly with zero recording needed. Q: Does this download or record courses? A: No. CourseSpeed controls video playback speed and captures audio for AI note generation only. It cannot and will not download, record, or redistribute course videos. Audio is discarded immediately after transcription. Subtitles are read from the player in memory only. Q: Is this allowed by learning platforms? A: Yes. CourseSpeed interacts only with the video playback interface, similar to adjusting volume or playback speed in any video player. It does not bypass DRM, access protected content, or interfere with platform authentication. Q: Why another speed controller when there are free ones? A: Most generic speed controllers lose your settings on page refresh, lack AI note-taking, and aren't optimized for course platforms. CourseSpeed was built because the developer personally lost hours of study notes when a generic speed controller's shortcuts reset mid-lecture.