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. Treats AI visibility as a research system rather than a rank tracker, the right mental model. growth-memo.com Article · How Founders Use AI 2026 Growth Memo research summary Kevin Indig (Growth Memo)
  2. HubSpot's CMO and growth lead demo and debate AI visibility measurement on air. podcasts.apple.com Podcast · How Founders Use AI Marketing Against The Grain (AEO tooling episodes) Kipp Bodnar & Kieran Flanagan (HubSpot)
  3. A YC-backed take on GEO tooling from ex-Google Search PMs, worth watching as the space matures. ycombinator.com Article · How Founders Use AI Launch YC: AthenaHQ, Get Your Brand Discovered on ChatGPT AthenaHQ (Y Combinator)
  4. Large-scale evidence that mentions and citations are different things, and how each is earned. semrush.com Article · How Founders Use AI How AI Search Really Works: Findings from Our AI Visibility Study Semrush
  5. Shows even one assistant cites differently by mode, so you must test prompts, not assume. semrush.com Article · How Founders Use AI Only 25% of cited sources overlap between ChatGPT's reasoning modes Semrush
  6. 3.7M citations analyzed: 91% of cited URLs appear in only one engine, which changes your whole strategy. growth-memo.com Article · How Founders Use AI The Consensus Gap Kevin Indig (Growth Memo)
  7. Video · How Founders Use AI How AI Search Engines Work (Ahrefs AEO Course 1.1) Ahrefs (Sam Oh)
  8. Video · How Founders Use AI How Ranking in Google AI Overviews, ChatGPT, and Perplexity Differ (Ahrefs AEO Course 1.2) Ahrefs (Sam Oh)
  9. Reputation specialists explain the authority and extractability signals engines reward. fiveblocks.com Article · How Founders Use AI How do AI-powered search engines like Perplexity rank and cite sources? Five Blocks
  10. Primary source on how ChatGPT rewrites queries and picks sources when it searches the web. help.openai.com Guide · How Founders Use AI ChatGPT Search (official help article) OpenAI
  11. The Perplexity founder explains RAG and citations in his own words, straight from the source. open.spotify.com Podcast · How Founders Use AI Aravind Srinivas: Perplexity CEO on the Future of AI, Search & the Internet Lex Fridman Podcast / Aravind Srinivas
  12. Original research on 31k keywords showing what answer engines actually cite versus what ranks. graphite.io Article · How Founders Use AI AI Content In Search & LLMs Graphite
  13. A quarter-million responses analyzed to show where models' brand opinions actually come from. seerinteractive.com Article · How Founders Use AI The GEO Olympics Study: What 231,347 LLM Responses Reveal About AI Brand Visibility Seer Interactive
  14. A plain-language walkthrough of the founding research if you skip the arXiv PDF. thegeocommunity.com Article · How Founders Use AI The Original GEO Paper: Princeton & IIT Delhi Study Findings Explained The GEO Community
  15. How the leading AI visibility platform frames retrieval, understanding, and citation mechanics. tryprofound.com Article · How Founders Use AI What is answer engine optimization (AEO)? Profound
  16. Separates training-data representation from live retrieval, the distinction most founders miss. ultrascout.ai Article · How Founders Use AI How Does ChatGPT Decide Which Brands to Recommend? UltraScout
  17. Digs into Perplexity's curated authority lists and freshness weighting. datastudios.org Article · How Founders Use AI How Does Perplexity Choose and Rank Its Information Sources? Data Studios
  18. Actionable list of the signals that get a page through Perplexity's reranking filters. keyword.com Guide · How Founders Use AI Perplexity AI ranking factors: A guide for SEOs Keyword.com
  19. Connects the citation mechanics directly to brand tactics you can execute this quarter. trysight.ai Article · How Founders Use AI How ChatGPT Cites Brands: Mechanics, Signals & Strategy Sight AI
  20. Focused specifically on earning Perplexity citations, the engine most founders ignore. tryanalyze.ai Guide · How Founders Use AI Perplexity AI Ranking Guide: What Drives Citations Analyze AI
  21. A living, community-vetted index of GEO research, tools, and guides to go deeper. github.com Guide · How Founders Use AI awesome-generative-engine-optimization (curated repo) Amplifying AI (GitHub community)
  22. Video · How Founders Use AI Webflow AEO Case Study (Graphite) Webflow x Graphite
  23. The biggest public dataset showing how heavily ChatGPT leans on Reddit and Wikipedia as evidence. semrush.com Article · How Founders Use AI Semrush Releases Expanded 2026 AI Visibility Index (126M prompts) Semrush
  24. Distills G2's answer-economy research into concrete moves for SaaS founders. foundationinc.co Article · How Founders Use AI How AI Search Is Rewiring B2B Software Buying (G2 Report analysis) Foundation Marketing

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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