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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. The compressed takeaways thread; a 2-minute read to align your team. x.com Thread · How Founders Use AI AEO is the biggest change in search in a decade Lenny Rachitsky In 2 answers
  2. The most data-driven annual read on what actually moves AI visibility. growth-memo.com Article · How Founders Use AI State of AI Search Optimization 2026 Kevin Indig In 2 answers
  3. One post consolidating a year of AI-search research findings. growth-memo.com Article · How Founders Use AI 2026 Growth Memo research summary Kevin Indig In 2 answers
  4. Video · How Founders Use AI Learn 80% of NotebookLM in Under 13 Minutes! Jeff Su In 2 answers
  5. Comet went free globally, making it the cheapest way to try agentic browsing. perplexity.ai Article · How Founders Use AI The Internet is Better on Comet (free worldwide) Perplexity In 2 answers
  6. The constructive half: the channels that still compound when search clicks die. sparktoro.com Article · How Founders Use AI When Google Stops Sending Clicks, What Still Works? Rand Fishkin, SparkToro In 2 answers
  7. The policy change (5-year retention if you opt in to training) every Claude user should know. anthropic.com Article · How Founders Use AI Updates to Consumer Terms and Privacy Policy Anthropic In 2 answers
  8. A legal read of the updated Claude terms for anyone handling client data. amstlegal.com Article · How Founders Use AI Anthropic's Claude AI Updates: Impact on Privacy & Confidentiality AMST Legal In 2 answers
  9. An independent privacy company's assessment of Claude's data handling. anonyome.com Article · How Founders Use AI Claude privacy: How Anthropic handles your data Anonyome Labs In 2 answers
  10. Five sharp prompts that pull the ICP out of your own customer history. forbes.com Article · How Founders Use AI 5 ChatGPT Prompts To Define Your Ideal Customer Profile Forbes (Jodie Cook) In 2 answers
  11. Goes beyond prompts to agents that enrich and update the ICP continuously. growthahoy.com Guide · How Founders Use AI How to build an Ideal Customer Profile with AI (and AI agents) Growth Ahoy In 2 answers
  12. Templates and examples so the AI output lands in a proven ICP structure. sybill.ai Guide · How Founders Use AI Ultimate ICP Guide: Build Your Ideal Customer Profile (Templates & Examples) Sybill In 2 answers
  13. A purpose-built generator when you want a structured first draft in minutes. m1-project.com Tool · How Founders Use AI AI ICP Generator M1-Project In 2 answers
  14. Methodical persona construction with the data-quality caveats spelled out. delve.ai Guide · How Founders Use AI How to Create Personas Using ChatGPT Delve AI In 2 answers
  15. Zapier's practical walkthrough, strong on wiring research into automations. zapier.com Guide · How Founders Use AI How to use ChatGPT for market research Zapier In 2 answers
  16. Setup, plan requirements, and current limits straight from the maker. support.claude.com Guide · How Founders Use AI Use Claude for Excel (official help) Anthropic In 2 answers
  17. A reusable Claude Skill that turns raw feedback into a consistent analysis every time. enterpret.com Article · How Founders Use AI Claude Skill for Customer Feedback Analysis: A Guide Enterpret In 2 answers
  18. Sixty tested prompts covering the exact models an early-stage founder needs. sidsaladi.substack.com Guide · How Founders Use AI Claude Financial Modeling 101: Setup Guide + 60 Prompts Sid Saladi In 2 answers
  19. A valuation firm's precise line between what AI drafts and what diligence demands. finrofca.com Article · How Founders Use AI AI Can Build Your Startup Financial Model. But It Can't Make It Investor-Ready. Finro In 2 answers
  20. The leading paid newsletter on turning ChatGPT and Claude into a real writing assistant. writewithai.substack.com Guide · How Founders Use AI Write With AI Nicolas Cole & Dickie Bush In 2 answers
  21. How to define your contrarian point of view before you let AI draft anything. patrickfrank.com Article · How Founders Use AI AI for Founders: Keep Your Voice Patrick Frank In 2 answers
  22. Social listening data: 82% of slop mentions are negative, so quality is the moat. meltwater.com Article · How Founders Use AI What the Rise of AI Slop Means for Marketers Meltwater In 2 answers
  23. The 45-90 minute brand voice prompt build, with hard constraint examples. genaiunplugged.substack.com Guide · How Founders Use AI How to Train Claude to Write in Your Exact Voice GenAI Unplugged In 2 answers
  24. Your literal voice: clone it for narration once your written voice is dialed. elevenlabs.io Tool · How Founders Use AI ElevenLabs Voice Cloning ElevenLabs In 2 answers

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1046 questions GTM Go-to-market, from breaking in to how the best teams do it. 352 questions D2C Building a direct-to-consumer brand, India-first. 482 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 154 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 278 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 390 terms
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