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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. From an India-founded ML platform: how gateways make model choice reversible. truefoundry.com Article · How Founders Use AI Helicone vs OpenRouter: Key Differences TrueFoundry
  2. The lock-in insurance layer compared hands-on, including India-built Portkey. klymentiev.com Guide · How Founders Use AI LLM Gateway guide: OpenRouter vs LiteLLM vs Portkey vs Helicone Dmytro Klymentiev
  3. A second, eval-minded view on routing layers so you can switch providers in an afternoon. braintrust.dev Article · How Founders Use AI 6 best LLM gateways for developers Braintrust
  4. Video · How Founders Use AI How I use LLMs Andrej Karpathy
  5. A regularly refreshed plain-English rundown of the current frontier models and their sweet spots. codingscape.com Article · How Founders Use AI Most powerful LLMs (Large Language Models) Codingscape
  6. YC partners on how model progress should shape what founders build now versus wait on. creators.spotify.com Podcast · How Founders Use AI The 10 Trillion Parameter AI Model With 300 IQ (Lightcone) Y Combinator (Lightcone Podcast)
  7. The essay that made evals a founder-level topic; failed LLM products almost always skipped this. hamel.dev Article · How Founders Use AI Your AI Product Needs Evals Hamel Husain
  8. A free written masterclass version if you want the method without the course fee. aakashg.com Guide · How Founders Use AI How to Master AI Evals: Step-by-Step with Hamel and Shreya Aakash Gupta (Product Growth)
  9. Open-source, config-file evals that run in CI; used by OpenAI and Anthropic themselves. github.com Tool · How Founders Use AI Promptfoo Promptfoo
  10. Gets your first automated eval running in under an hour. datacamp.com Guide · How Founders Use AI Promptfoo Tutorial: A Hands-On Guide to LLM Evaluation DataCamp
  11. A current map of the eval tooling landscape so you pick once, correctly. braintrust.dev Article · How Founders Use AI Best Prompt Evaluation Tools (Tested and Compared) Braintrust
  12. Video · How Founders Use AI AI Engineer World's Fair 2025: Evals track AI Engineer conference
  13. A conversational companion to Hamel's essay with concrete team workflows. humanloop.com Article · How Founders Use AI Why Your AI Product Needs Evals, with Hamel Husain Humanloop
  14. A live-demo episode: watch error analysis actually being done on screen. podcasts.apple.com Podcast · How Founders Use AI Evals, error analysis, and better prompts | Hamel Husain How I AI (Claire Vo)
  15. Distils the conference's eval takeaways, including hunting implicit user feedback signals. vellum.ai Article · How Founders Use AI Big Ideas from the AI Engineer World's Fair Vellum
  16. How to make your AI coding tools carry the eval workload for you. hamelhusain.substack.com Article · How Founders Use AI Evals Skills for Coding Agents Hamel Husain
  17. Turning evals into a deploy gate so a bad prompt change never reaches users. braintrust.dev Article · How Founders Use AI Best AI Eval Tools for CI/CD Pipelines Braintrust
  18. A vendor-neutral ranking to cross-check the tool vendors' own comparisons. techsy.io Article · How Founders Use AI 8 LLM Eval Tools Ranked: No Product to Sell TECHSY
  19. A trusted independent voice explaining why iteration speed is the whole game. simonwillison.net Article · How Founders Use AI Simon Willison on "Your AI Product Needs Evals" Simon Willison
  20. How to use one model to grade another without inheriting its biases. deepeval.com Article · How Founders Use AI LLM-as-a-Judge: Top evaluation techniques and best practices Confident AI (DeepEval)
  21. A practical setup guide for automated judging, the technique that makes evals scale. agenta.ai Guide · How Founders Use AI LLM as a Judge: Guide to LLM Evaluation Best Practices Agenta
  22. The clearest end-to-end explainer of why hallucinations happen and the layered defences that work. lakera.ai Guide · How Founders Use AI LLM Hallucinations: Understand and Tackle AI's Most Persistent Quirk Lakera
  23. Separates factuality from faithfulness errors and matches each to its fix. getzep.com Article · How Founders Use AI How to Reduce LLM Hallucinations Zep
  24. A prioritized playbook: grounding and abstention first, verification where errors are expensive. futureagi.com Article · How Founders Use AI How to Reduce LLM Hallucinations: 7 Proven Strategies Future AGI

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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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