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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. Video · How Founders Use AI I Tested Claude in Excel and It Has Blown my Mind Excel Champs
  2. Video · How Founders Use AI How to Use Claude for Excel: Complete Beginner Guide Teacher's Tech
  3. Independent evidence of a full working spreadsheet built from a single prompt. x.com Thread · How Founders Use AI Ethan Mollick: Claude's Excel ability is the best I have seen (406 formulas from one prompt) Ethan Mollick
  4. Why the same model gives different quality depending on how the spreadsheet agent works. x.com Thread · How Founders Use AI Ethan Mollick: Claude in Excel vs Microsoft's own Excel agent Ethan Mollick
  5. A skeptical outside view on where the add-in fits against Copilot. techradar.com Article · How Founders Use AI Anthropic's Claude just invaded Excel TechRadar Pro
  6. A veteran analyst's balanced scorecard, useful before you trust it with your model. dataanalysis.substack.com Article · How Founders Use AI Claude for Excel: What It Does Well and Where It Still Falls Short Olga Berezovsky (Data Analysis Journal)
  7. Google's own map of what Gemini can do inside Sheets, from charts to insights. workspace.google.com Guide · How Founders Use AI Gemini in Google Sheets (official hub) Google Workspace
  8. The reference for =AI("prompt", range), the single most useful Sheets AI primitive. support.google.com Guide · How Founders Use AI Use the AI function in Google Sheets Google
  9. The primary-source changelog on Gemini generating and filling data in Sheets. workspaceupdates.googleblog.com Article · How Founders Use AI Generate data with Gemini in Google Sheets Google Workspace Updates
  10. Video · How Founders Use AI How to Use the NEW Google Sheets AI Function Peter's Google Tips
  11. Video · How Founders Use AI Use the AI Function in Google Sheets Flipped Classroom Tutorials
  12. Video · How Founders Use AI Work Smarter with Google Sheets AI (Gemini Tutorial) Stewart Gauld
  13. Worked examples of categorizing and summarizing data in cells without add-ons. kdnuggets.com Article · How Founders Use AI A Beginner's Guide to Mastering Gemini + Google Sheets KDnuggets
  14. Video · How Founders Use AI How to Use Copilot in Excel: Full Tutorial (2025) Lisa Crosbie
  15. An India-based data community's practical walkthrough with prompt examples. analyticsvidhya.com Article · How Founders Use AI How to Use Gemini in Google Sheets Analytics Vidhya
  16. A quick, neutral capability matrix across the big three chat tools. geeksforgeeks.org Article · How Founders Use AI ChatGPT vs Claude vs Gemini for Data Analysis: A Comparative Overview GeeksforGeeks
  17. Tests the models on actual marketing datasets rather than benchmarks. improvado.io Article · How Founders Use AI Claude vs ChatGPT vs Gemini vs DeepSeek: Which AI Drives Faster Marketing Insights? Improvado
  18. A head-to-head on the same dataset, exactly the comparison a founder needs. datacareerpodcast.com Podcast · How Founders Use AI ChatGPT vs Julius AI: Who Analyzes Data Better? (ep 169) Data Career Podcast (Avery Smith)
  19. Video · How Founders Use AI Julius AI Review: Data Analysis, Charts, AI Insights Tested ThesisAI
  20. Clarifies the chat-tool vs notebook-platform split so you don't overbuy. deepnote.com Article · How Founders Use AI Hex vs Julius AI: a side-by-side comparison Deepnote
  21. Vendor-written but unusually candid about when plain ChatGPT is the right answer. julius.ai Article · How Founders Use AI Julius AI vs ChatGPT: What's Better for Data Analysis and You? Julius AI
  22. A recent, detailed comparison including reasoning depth and hallucination tendencies. elephas.app Article · How Founders Use AI ChatGPT vs Claude vs Gemini: A Comprehensive Data Analysis Elephas
  23. A builder's shortlist that cuts the market down to five real options. guptadeepak.com Article · How Founders Use AI Top 5 AI Data Analysis Tools: Julius AI vs ChatGPT vs the Rest Deepak Gupta
  24. Where to graduate when your team needs SQL, notebooks, and shared data apps. hex.tech Tool · How Founders Use AI Hex: the AI analytics platform Hex

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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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