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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. Explains traces, spans, and generations with the main tools side by side. langflow.org Article · How Founders Use AI LLM Observability Explained (Langfuse, LangSmith, LangWatch) Langflow
  2. The operations chapter: daily habits of teams that keep LLM features healthy in production. oreilly.com Article · How Founders Use AI What We Learned from a Year of Building with LLMs (Part II): Operations Eugene Yan, Hamel Husain, et al.
  3. A menu of AI-specific metrics beyond DAUs, from acceptance rate to cost per active user. mixpanel.com Article · How Founders Use AI 30+ AI product metrics to track today Mixpanel
  4. Includes the killer diagnostic: compare AI-user retention curves against your product baseline. institutepm.com Guide · How Founders Use AI AI Product Metrics That Actually Matter Institute of Product Management
  5. Connects AI feature metrics to the board-level numbers investors ask about. thesaasbarometer.substack.com Article · How Founders Use AI AI Metrics that Matter in 2025 SaaS Barometer
  6. Last's first outside interview on the practical engineering of a reliable AI product at scale. open.spotify.com Podcast · How Founders Use AI How Notion Cofounder Simon Last Builds AI for Millions of Users AI and I (Dan Shipper, Every)
  7. A setup-to-dashboards walkthrough for self-hosting the free stack. prismix.dev Guide · How Founders Use AI Langfuse Guide: Open-Source LLM Observability and Tracing Prismix
  8. An India-based engineering firm's field guide to the metrics and tooling that matter. cloudraft.io Article · How Founders Use AI LLM Observability: Monitoring Large Language Models CloudRaft (India)
  9. Monitoring and optimization together, from an India-founded AI quality platform. getmaxim.ai Article · How Founders Use AI How to Reduce LLM Cost and Latency: A Practical Guide for Production AI Maxim AI (India)
  10. Updated adoption frameworks that treat AI feature usage as its own funnel. userpilot.com Article · How Founders Use AI How to Measure Product Adoption: Metrics for Human Users and AI Agents Userpilot
  11. Useful for B2B founders whose buyers now ask for AI usage reporting. capably.ai Article · How Founders Use AI Measuring AI Adoption Metrics Capably
  12. Why accuracy alone is a vanity metric and what to track instead. stackai.com Article · How Founders Use AI Measuring Enterprise AI Success: Essential KPIs Beyond Accuracy StackAI
  13. Video · How Founders Use AI How Perplexity works | Aravind Srinivas and Lex Fridman Lex Fridman
  14. Video · How Founders Use AI Can Perplexity beat Google? | Aravind Srinivas and Lex Fridman Lex Fridman
  15. Video · How Founders Use AI Perplexity CEO explains RAG: Retrieval-Augmented Generation Lex Fridman
  16. Video · How Founders Use AI Nikhil Kamath ft. Perplexity CEO Aravind Srinivas | WTF Online Ep 1 Nikhil Kamath (WTF)
  17. The Wharton professor's definitive framing of the shift from searching for links to delegating research. oneusefulthing.org Article · How Founders Use AI The End of Search, The Beginning of Research Ethan Mollick
  18. The primary source on how ChatGPT blends live web results with a conversational interface. openai.com Article · How Founders Use AI Introducing ChatGPT search OpenAI
  19. Google's CEO pressed hard on what AI answers do to the web, straight from the incumbent's mouth. podcasts.apple.com Podcast · How Founders Use AI Google's Sundar Pichai on AI-powered search and the future of the web (Decoder) Nilay Patel, The Verge
  20. A hands-on, regularly updated comparison of the two tools founders reach for first. zapier.com Article · How Founders Use AI Perplexity vs. ChatGPT: Which AI tool is better? Zapier
  21. Side-by-side query tests that show concretely when AI search saves time and when Google still wins. felloai.com Article · How Founders Use AI Google Search vs. Perplexity: The Best Search Tool for Daily Use in 2025 Fello AI
  22. A structured teardown of how the answer-engine experience differs from the link-list experience. llmrefs.com Article · How Founders Use AI Perplexity vs Google: A Head-to-Head SEO and UX Analysis LLMrefs
  23. The official quick-start covering Search, Research and Labs modes so you use the right one per task. perplexity.ai Guide · How Founders Use AI Getting Started with Perplexity Perplexity
  24. Video · How Founders Use AI How To Use Perplexity AI For Research - Terrifyingly SMART! AI educator (YouTube)

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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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