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. The paper that named RAG: a model paired with a retriever over a document index, answering more factually than the model alone. arxiv.org Article · How Founders Use AI Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks Patrick Lewis et al.
  2. A plain explainer of how retrieval, augmentation and generation fit, and why RAG is cheaper than retraining a model. aws.amazon.com Article · How Founders Use AI What is RAG? AWS
  3. Anthropic's measured fix for the weak step in RAG: contextual chunks cut failed retrievals by 49%, and by 67% with reranking. anthropic.com Article · How Founders Use AI Introducing Contextual Retrieval Anthropic
  4. The quickest hosted RAG: upload files to a vector store and let the model search them, with no database of your own. developers.openai.com Guide · How Founders Use AI File search (OpenAI API) OpenAI
  5. Video · How Founders Use AI What is Retrieval-Augmented Generation (RAG)? IBM Technology
  6. Google's explainer, including when RAG beats fine-tuning and how grounding reduces made-up answers. cloud.google.com Article · How Founders Use AI What is retrieval-augmented generation? Google Cloud
  7. Google's steps to create a key in AI Studio, what happens for new and existing Cloud users, and how to keep it safe. ai.google.dev Guide · How Founders Use AI Using Gemini API keys Google
  8. The free and paid tiers by model: Gemini 3.8 Flash is free on the free tier ($0.75 / $3.75 per million tokens paid until 31... ai.google.dev Tool · How Founders Use AI Gemini Developer API pricing Google
  9. OpenAI's first steps: create an API key in the dashboard, export it as an environment variable and make your first call. developers.openai.com Guide · How Founders Use AI Developer quickstart OpenAI
  10. Which kind of key to use for your own testing, a deployed app or automation, and why one developer's key should not run... developers.openai.com Guide · How Founders Use AI API keys and service accounts OpenAI
  11. Pro plans include $100, $200 or $500 of API credits a month and Business seats $20 or $100, claimed by linking the subscription... developers.openai.com Guide · How Founders Use AI API credits for ChatGPT subscribers OpenAI
  12. The same steps for Anthropic's API, if you want a Claude key as well. platform.claude.com Guide · How Founders Use AI Get started with Claude Anthropic
  13. An AI research assistant for academic papers, with a free plan, for screening and extracting data from many studies. elicit.com Tool · How Founders Use AI Elicit pricing Elicit
  14. A tool that tracks how often ChatGPT, Perplexity and Google's AI answers mention and cite your brand against competitors. tryprofound.com Tool · How Founders Use AI Profound Profound
  15. How to keep sessions, files, instructions and connected tools in one shareable workspace. perplexity.ai Guide · How Founders Use AI What are Projects? Perplexity
  16. The discounted plan for verified students and educators, with everything in Pro. perplexity.ai Guide · How Founders Use AI What is Education Pro? Perplexity
  17. Video · How Founders Use AI How To Use Perplexity AI (Best AI Research Tool) Paul J Lipsky
  18. Google's help page: how AI Mode searches subtopics at once, and the full list of countries (India included) and languages it... support.google.com Guide · How Founders Use AI Get AI-powered responses with AI Mode in Google Search Google
  19. Google's launch post on what AI Mode is for and how it differs from AI Overviews. blog.google Article · How Founders Use AI Expanding AI Overviews and introducing AI Mode Google
  20. Google's own page: AI Overviews are a core feature that cannot be turned off, the Web filter shows only text links, AI in... support.google.com Guide · How Founders Use AI Find information in faster & easier ways with AI Overviews in Google Search Google Search Help
  21. How to add a custom site search in Chrome and make it the default, which is how the udm=14 Web view becomes your everyday search. support.google.com Guide · How Founders Use AI Set your default search engine Google Chrome Help
  22. The article that found the udm=14 parameter behind Google's Web filter and shows how to set it as the default in each browser. tedium.co Article · How Founders Use AI How I made Google's 'Web' view my default search Ernie Smith (Tedium)
  23. A free page that runs your search straight into Google's Web view with no AI Overview, from the people who documented udm=14;... udm14.com Tool · How Founders Use AI &udm=14 Tedium
  24. What AI Mode is and how it differs from AI Overviews, so you know which of the two you are looking at. support.google.com Guide · How Founders Use AI Get AI-powered responses with AI Mode in Google Search Google Search Help

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The hubs