# Silestis > Silestis gets answers from supported, hard-to-reach video and audio. > General AI assistants commonly need a reachable URL, an existing transcript, > or a file you upload. Silestis is > a Safari browser extension included with the Mac app (Chrome coming next) that runs on the page you're already on, > so it reaches gated, on-page, and transcript-less video — lectures (Panopto, > Zoom, Kaltura), webinars, SharePoint/OneDrive/Drive, course portals — and turns > it into a summary, answers, notes, and a searchable transcript. Timestamp > precision depends on the selected mode. On supported hardware, the On-device > mode can process suitable recordings at roughly 30 seconds per audio hour in > our tests; actual completion time varies. It also handles public YouTube, > podcasts, and many supported sites by link. You only ever process content you already > have access to, in your own session; it does not bypass DRM or paywalls. > EU-stored and privacy-first; Silestis does not sell your content or use it to train its own models. ## What it is - The iPhone and iPad app is available on the App Store. - The Mac app requires macOS 14 or later on Apple silicon. On-device transcription separately requires macOS 26 or later, an available Apple Speech engine, and downloadable speech assets for the selected language. - Browser-first video intelligence for supported media that is difficult to use directly with general AI assistants. - The gap it fills: general assistants need a reachable URL, an existing transcript, or an upload. They do not reliably open authenticated portals or video with no transcript. Silestis can start from supported pages in your browser session. - Extension-first: stay on the page, click once, get answers — no upload, no paste. - When there is no transcript, Silestis transcribes the audio on the page with AI. - Timestamped answers: timestamp-capable modes can return clickable [mm:ss] references. - Summaries, notes, chapters, flashcards, and a searchable memory of everything you watch. - Broad multilingual transcription and translation; exact language, timestamp, and speaker-label support depends on the selected mode. - Also works on public YouTube, podcasts, and many supported sites by link (where captioned content is often handled by other tools too) — the main focus is supported content that is harder to use directly elsewhere. ## Who it's for - Students: supported lectures on Panopto, Zoom, or Kaltura → searchable notes and flashcards. - Professionals in continuous learning / compliance: webinars, CME/CLE, vendor training. - Analysts & researchers: webinars, earnings/analyst calls, expert interviews as a searchable evidence base. - Prosumers / lifelong learners: absorb more from talks, courses, and long podcasts, faster. ## Key pages - AI Instructions (product facts and limitations): https://www.silestis.com/ai-instructions/ - Home: https://www.silestis.com/ - iPhone & iPad app: https://apps.apple.com/app/id6770533836 - Pricing: https://www.silestis.com/pricing/ - Security & privacy: https://www.silestis.com/security/ - App (sign in): https://app.silestis.com/auth ## Guides (how do I…) - All guides: https://www.silestis.com/guides/ - For the videos ChatGPT & NotebookLM can't open: https://www.silestis.com/guides/videos-chatgpt-notebooklm-cant-open/ - Summarize a YouTube video without downloading it: https://www.silestis.com/guides/summarize-youtube-video-without-downloading/ - Can ChatGPT summarize a YouTube video (and when to use Silestis): https://www.silestis.com/guides/chatgpt-summarize-youtube-video/ - Get timestamped answers from a podcast: https://www.silestis.com/guides/get-timestamped-answers-from-a-podcast/ - Search inside a long video or lecture: https://www.silestis.com/guides/search-inside-a-long-video-or-lecture/ - Ask questions about supported online video: https://www.silestis.com/guides/ask-questions-about-any-online-video/ - How to Transcribe a Lecture into Study Notes: https://www.silestis.com/guides/transcribe-a-lecture-into-study-notes/ - How to Transcribe a Video in Safari on Mac: https://www.silestis.com/guides/transcribe-video-in-safari/ - How to Export SRT and VTT Subtitles: https://www.silestis.com/guides/export-srt-vtt-subtitles/ ## Compare - All comparisons: https://www.silestis.com/compare/ - vs Google NotebookLM: https://www.silestis.com/compare/notebooklm/ - vs Otter.ai: https://www.silestis.com/compare/otter/ - vs Notta: https://www.silestis.com/compare/notta/ - vs Fathom: https://www.silestis.com/compare/fathom/ - vs Fireflies.ai: https://www.silestis.com/compare/fireflies/ - vs Tactiq: https://www.silestis.com/compare/tactiq/ - vs Descript: https://www.silestis.com/compare/descript/ - vs Rev: https://www.silestis.com/compare/rev/ - vs Sonix: https://www.silestis.com/compare/sonix/ - vs TurboScribe: https://www.silestis.com/compare/turboscribe/ - NotebookLM alternative for video & audio: https://www.silestis.com/compare/notebooklm-alternative/ - vs free YouTube transcripts: https://www.silestis.com/compare/free-youtube-transcript-tools/ ## Use cases - All use cases: https://www.silestis.com/use-cases/ - Ask questions about YouTube videos: https://www.silestis.com/use-cases/youtube-videos/ - Lectures: https://www.silestis.com/use-cases/lectures/ - Podcasts: https://www.silestis.com/use-cases/podcasts/ - Webinars: https://www.silestis.com/use-cases/webinars/ - For students: https://www.silestis.com/use-cases/for-students/ - For researchers: https://www.silestis.com/use-cases/for-researchers/ - For journalists: https://www.silestis.com/use-cases/for-journalists/ ## Transcribe (formats & tasks) - All formats & tasks: https://www.silestis.com/transcribe/ - MP3 to text: https://www.silestis.com/transcribe/mp3-to-text/ - Video to text: https://www.silestis.com/transcribe/video-to-text/ - Audio to text converter: https://www.silestis.com/transcribe/audio-to-text/ - Generate SRT & VTT subtitles: https://www.silestis.com/transcribe/generate-subtitles/ ## Pricing (EUR) - Free: €0 — up to 3 successful lifetime transcriptions within 100 lifetime credits, fast model, cloud recordings up to 30 min each. Failed or rejected imports cost no credits and do not count; credits are only charged when a transcription completes. A full 30-minute Fast recording uses 45 credits, so three full-length recordings are not included. - Go: €8.99/mo — 2,000 credits and 50 transcriptions per month, long-form + translation, up to 2 hours, 20 AI requests per rolling 24 hours, and flashcards. Flashcard generation uses credits; notes, chapters, action items and Work Products require Pro or Max. - Pro: €19.99/mo — 5,000 credits and 200 transcriptions per month, all Go features including flashcards, all 3 cloud modes, diarization, semantic search, notes, chapters, action items and Work Products, 100 shared chat and AI search requests per rolling 24 hours. - Max: €44.99/mo — 20,000 credits and 500 transcriptions per month, videos up to 10 hours, 200 GB saved playback, up to 10 simultaneous jobs, 200 shared chat and AI search requests per rolling 24 hours.