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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. Video · How Founders Use AI How to Size Your Addressable Market (TAM, SAM, SOM, top-down vs. bottom-up) YouTube creator (startup education)
  2. Video · How Founders Use AI How To Size Your Market (TAM, SAM, SOM Explained Simply) YouTube creator (startup education)
  3. Video · How Founders Use AI Must watch before you start up | TAM SAM SOM | Market size calculation YouTube creator (startup education)
  4. Current investor expectations, including the Carta data on presenting both sizing directions. waveup.com Guide · How Founders Use AI TAM, SAM, SOM: How to calculate market size Waveup
  5. Reverse-engineers the evaluator's checklist so your AI-assisted numbers answer the real questions. goingvc.com Article · How Founders Use AI How Investors Use TAM, SAM, SOM to Evaluate Startups GoingVC
  6. A practical sizing guide from an Indian product studio, useful for India-market examples. f22labs.com Guide · How Founders Use AI TAM, SAM & SOM: How To Calculate the Market Size? F22 Labs (India)
  7. A free AI calculator to generate a first-draft TAM/SAM/SOM you then verify. founderpal.ai Tool · How Founders Use AI AI Market Size Calculator (free, no email) FounderPal
  8. Structured inputs stop you from letting the AI invent the assumptions. pmtoolkit.ai Tool · How Founders Use AI Free TAM SAM SOM Calculator: Investor-Ready Market Sizing in 10 Minutes PM Toolkit
  9. A pitch-deck consultancy's view on presenting the numbers investors will not roll their eyes at. spectup.com Guide · How Founders Use AI TAM, SAM, SOM: The Founder's Guide To Market Sizing Spectup
  10. Benchmarks to sanity-check whether the number your AI produced is even plausible for your industry. worthbuild.io Article · How Founders Use AI What Is a Good TAM for a Startup? Benchmarks by Industry WorthBuild
  11. Video · How Founders Use AI Market research with ChatGPT YouTube creator (AI tutorials)
  12. Video · How Founders Use AI ChatGPT Deep Research: Turn Market Analysis into Revenue (Full Guide) YouTube creator (AI for business)
  13. Video · How Founders Use AI Unlocking ChatGPT's Deep Research: Marketing Innovation w/ HubSpot CMO Kipp Bodnar HubSpot (Kipp Bodnar)
  14. Video · How Founders Use AI How to Use ChatGPT Deep Research: Generate Reports YouTube creator (AI tutorials)
  15. Video · How Founders Use AI How I used ChatGPT to do my niche's market research (in 20 min) YouTube creator (solopreneurship)
  16. One well-constructed research prompt, dissected so you can adapt it. inc.com Article · How Founders Use AI This Single ChatGPT Prompt Can Do Hours of Market Research in Minutes Inc. (Ben Sherry)
  17. A VC's view of the founder use cases where deep research replaces a hired consultant. iaglobal.vc Article · How Founders Use AI How to Grow Your Startup Using ChatGPT Deep Research IA Global VC
  18. Ready-made Perplexity prompts tuned for market questions. useme.com Guide · How Founders Use AI Quick Guide to Perplexity for Market Research (with Prompts) Useme
  19. Nine real tests that show where Perplexity's reports are strong and where they thin out. secondtalent.com Article · How Founders Use AI Perplexity Deep Research Review: 9 Real-World Tests Second Talent
  20. Prompt patterns you can adapt from marketing research to market research. godofprompt.ai Guide · How Founders Use AI 10 ChatGPT Deep Research Prompts For Marketing God of Prompt
  21. Covers Gemini's killer feature: editing the research plan before the agent runs. digitalapplied.com Guide · How Founders Use AI Google Gemini Deep Research: Complete Guide Digital Applied
  22. The gentlest on-ramp if deep research agents are new to you. exploreaitogether.com Guide · How Founders Use AI How to Use Gemini Deep Research: Complete Beginner's Guide Explore AI Together
  23. Business-research-specific comparison including cost per useful report. aryabhconsulting.com Article · How Founders Use AI Deep Research AI Tools Comparison: Gemini vs ChatGPT vs Perplexity for Business Research Aryabh Consulting
  24. Video · How Founders Use AI [The Mom Test] AI can't run your customer interviews (but it *can* help in other ways) Rob Fitzpatrick

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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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