Explore · The library

Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

What founders use most, ranked by how many answers lean on it.

  1. YouTube's free library of royalty-free production music and sound effects, copyright-safe for your YouTube videos, found in... support.google.com Guide · How Founders Use AI Use music and sound effects from the Audio Library YouTube
  2. Basic is free with 500 credits and 10 minutes of video a month, watermarked; Starter is $19 a month for 1,250 credits and... synthesia.io Tool · How Founders Use AI Synthesia pricing Synthesia
  3. How to scan yourself with a phone to make an avatar with your own visual and audio likeness, call it into any shot with @me,... support.google.com Guide · How Founders Use AI Create and use your avatar in Google Flow Google
  4. How YouTube adds translated audio tracks to your videos, who is eligible, and how to review a dub before it goes live. support.google.com Guide · How Founders Use AI Use automatic dubbing YouTube
  5. YouTube's inauthentic content rule: mass-produced, generic or repetitive videos are not eligible for monetisation, the line... support.google.com Guide · How Founders Use AI YouTube channel monetization policies YouTube
  6. Professional 2D animation and motion graphics for Mac and Windows, completely free to download and use for individuals, with... cavalry.studio Tool · How Founders Use AI Cavalry Cavalry (Canva)
  7. Blender's Grease Pencil tools for drawing 2D in a 3D viewport, with full animation support and onion skinning, in free and... blender.org Tool · How Founders Use AI Blender: story art and 2D animation Blender Foundation
  8. The free, open-source painting program's own guide to frame-by-frame animation, starting with a walk cycle. docs.krita.org Guide · How Founders Use AI Animation with Krita Krita
  9. A free frame-by-frame animation app for phones and tablets, the easiest place to start drawing animation by hand. flipaclip.com Tool · How Founders Use AI FlipaClip FlipaClip
  10. Animated character videos from a script or a document: Starter $58 a month billed yearly ($699 a year), Professional $100 a... vyond.com Tool · How Founders Use AI Vyond plans Vyond
  11. Runway's own video model, which it says ranked first on the Artificial Analysis text-to-video benchmark at launch. runway.com Article · How Founders Use AI Introducing Runway Gen-4.5 Runway
  12. The model for editing existing video: adding, removing and transforming objects, generating new angles of a scene, and changing... runway.com Article · How Founders Use AI Introducing Runway Aleph Runway
  13. Who Runway is, its research into world models, and its offices in New York, San Francisco, London, Tokyo and elsewhere. runway.com Article · How Founders Use AI About Runway Runway
  14. Runway's CEO Cristobal Valenzuela on where AI video is going and why the company is building world models. techcrunch.com Podcast · How Founders Use AI Is AI video just a prequel? Runway's CEO thinks world models are next TechCrunch Equity
  15. An independent report on the Gen-4.5 launch and where Runway stands against the big labs. cnbc.com Article · How Founders Use AI Runway rolls out Gen-4.5 AI video model that beats Google, OpenAI CNBC
  16. A free plan of 60 credits a month, where one credit is one minute of uploaded video; paid plans remove the watermark and export... vizard.ai Tool · How Founders Use AI Vizard pricing Vizard
  17. How to ask Gemini to find a video and summarise it, the setting it needs, and what it cannot do with your YouTube account. support.google.com Guide · How Founders Use AI Find and ask about YouTube content in Gemini Apps Google
  18. YouTube's built-in Ask feature for questions about the video you are watching: who can use it, on which devices, and its limits. support.google.com Guide · How Founders Use AI Ask YouTube on the watch page YouTube
  19. One-time packages with no subscription: Basic $29, Professional $39 for 50 headshots in 30 minutes, Executive $59, a free redo,... headshotpro.com Tool · How Founders Use AI HeadshotPro pricing HeadshotPro
  20. Basic, Standard and Executive packages for 40, 60 and 100 headshots, priced $35, $45 and $75 on the current offer, with a full... aragon.ai Tool · How Founders Use AI Aragon pricing Aragon
  21. Indian legal research that cites the judgments and statutes behind each answer, document review, translation into 23 languages... lexlegis.ai Tool · How Founders Use AI Lexlegis AI Lexlegis
  22. Legal AI agents used by more than 16,150 lawyers and 650 judges, the team behind the Karnataka High Court's move to paperless... jhana.ai Tool · How Founders Use AI jhana jhana
  23. The Indian legal research database with AI search, case management, compliance and contract tools added. manupatra.ai Tool · How Founders Use AI Manupatra legal tech suite Manupatra
  24. Which plans include Notion AI (Business and Enterprise), how Notion credits are spent, and how your data is handled. notion.com Guide · How Founders Use AI Notion AI FAQs Notion Help Center

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1327 questions GTM Go-to-market, from breaking in to how the best teams do it. 379 questions D2C Building a direct-to-consumer brand, India-first. 512 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 165 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 360 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 425 terms