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. An honest experiment exposing where AI validation helps and where it flatters you. ideadose.dev Article · How Founders Use AI Can ChatGPT Validate Your Startup Idea? We Tested 3 Ideas to Find Out IdeaDose In 2 answers
  2. A ruthless 30-minute kill-or-continue protocol you can run tonight. ai.plainenglish.io Article · How Founders Use AI The 30-Minute Startup Test: How I Use ChatGPT to Validate (or Kill) Any Business Idea Ashok Reddy In 2 answers
  3. A broad prompt bank covering TAM/SAM/SOM, personas and pricing research. juma.ai Guide · How Founders Use AI 28 ChatGPT Prompts For Market Research That Work Juma AI In 2 answers
  4. Step-by-step Gemini workflow, plus how it compares to ChatGPT and Claude for CI. mindstudio.ai Guide · How Founders Use AI How to Use Gemini Deep Research for Competitive Intelligence and Market Reports MindStudio In 2 answers
  5. The most ambitious version of customer-conversation mining you can steal ideas from. lennysnewsletter.com Article · How Founders Use AI How I AI: CEO turned 25,000 hours of sales calls into a self-learning GTM engine Lenny's Newsletter (How I AI) In 2 answers
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  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. Updated 9 November 2026: a social-first roundup of writing, design, video and scheduling tools from a team that runs its own... buffer.com Article · How Founders Use AI 17 best AI tools for social media content creation (tested for 2026) Buffer In 2 answers

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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
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