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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. Heller sold Casetext for $650M; he explains exactly where the defensibility lived. creators.spotify.com Podcast · How Founders Use AI Why Vertical LLM Agents Are The New $1 Billion SaaS Opportunities Y Combinator with Jake Heller (Casetext)
  2. When everyone has the same models, taste and product quality become the differentiator. open.spotify.com Podcast · How Founders Use AI Figma's CEO: Why AI makes design, craft, and quality the new moat Lenny's Podcast with Dylan Field
  3. A crisp synthesis of the Gil and Tavel schools applied to today's AI stack. ntkris.substack.com Article · How Founders Use AI Defensibility in AI Krishna's Newsletter
  4. The contrarian 2026 update: distribution, not technology, decides who wins. forbes.com Article · How Founders Use AI Every Company Is Now An AI Wrapper So GTM Is The New Moat Josipa Majic (Forbes)
  5. A taxonomy of AI-era moats with named startup examples for each. eoncodes.substack.com Article · How Founders Use AI The Startup Moats Defining the AI Era Andre J (Substack)
  6. How systems design makes usage data inseparable from the product, the subtlest moat. latitudemedia.com Article · How Founders Use AI In the age of AI, can startups still build a moat? Latitude Media
  7. Practitioners on building with LLMs without getting outmaneuvered by the labs. oreilly.com Article · How Founders Use AI What We Learned from a Year of Building with LLMs (Part III): Strategy Eugene Yan, Hamel Husain, et al.
  8. Why speed itself is now a moat, and what that demands of a small team. a16z.com Podcast · How Founders Use AI How AI Created the Fastest Product Cycle in History a16z (Anish Acharya)
  9. The manifesto that successful agents are mostly well-engineered software with LLM sprinkled at key points. github.com Guide · How Founders Use AI 12-Factor Agents: principles for production LLM software Dex Horthy (HumanLayer)
  10. A working engineer's decision criteria with cost and reliability tradeoffs spelled out. towardsdatascience.com Article · How Founders Use AI A Developer's Guide to Building Scalable AI: Workflows vs Agents Towards Data Science
  11. Short and sharp: if the steps are known in advance, a workflow wins on every axis. redis.io Article · How Founders Use AI AI Agents vs Workflows: When to Use Each Redis
  12. A neutral reference explainer to align your team on terminology before the build debate. promptingguide.ai Guide · How Founders Use AI AI Workflows vs AI Agents Prompt Engineering Guide (DAIR.AI)
  13. How a regulated enterprise makes the call, useful discipline for any founder. medium.com Article · How Founders Use AI AI agents vs. predefined workflows: practical decision guide Capital One Tech
  14. Brings the production data: only 23% of orgs have scaled an agent anywhere. intuitionlabs.ai Article · How Founders Use AI AI Agents vs. AI Workflows: Why Pipelines Dominate IntuitionLabs
  15. The founder-flavoured argument against reaching for the harder, smarter-sounding option. buildmvpfast.com Article · How Founders Use AI AI Workflows vs Agents: Why Workflows Win BuildMVPFast
  16. Video · How Founders Use AI Everything Gets Rebuilt: The New AI Agent Stack Harrison Chase (LangChain)
  17. The Sierra founder on where agents genuinely outperform, from thousands of deployments. open.spotify.com Podcast · How Founders Use AI Transforming Customer Service through Company Agents, with Bret Taylor No Priors (Sarah Guo and Elad Gil)
  18. The next interaction pattern: agents that act on events, with humans approving at checkpoints. inferencebysequoia.substack.com Article · How Founders Use AI Ambient Agents and the New Agent Inbox Sequoia Capital
  19. The developer-facing detail on what is stored, for how long, and how to reduce it. developers.openai.com Guide · How Founders Use AI Data controls in the OpenAI platform OpenAI
  20. The policy to quote when a customer asks whether their data trains the model. openai.com Guide · How Founders Use AI How your data is used to improve model performance OpenAI
  21. Anthropic's own account of what its API keeps: your prompts and Claude's outputs are not retained by default, with zero data... platform.claude.com Guide · How Founders Use AI API and data retention (Claude docs) Anthropic
  22. Where to pull compliance artifacts when an enterprise customer sends a security questionnaire. anthropic.com Guide · How Founders Use AI Anthropic's Transparency Hub Anthropic
  23. The ten security risks unique to LLM apps, with prompt injection at number one. aembit.io Article · How Founders Use AI OWASP Top 10 for LLM Applications, explained Aembit
  24. Concrete examples of each attack and the layered defences OWASP recommends. oligo.security Guide · How Founders Use AI OWASP Top 10 LLM: Examples and Mitigation Strategies Oligo Security

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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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