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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. How an always-on agent is fenced in: its own sandboxed computer, read-only background research, auto-review of actions and... openai.com Article · How Founders Use AI How we build safety, security, and privacy into dots OpenAI In 4 answers
  2. Google's own post on Gemini Omni Flash in Flow: generate, then refine a clip conversationally with characters kept consistent. blog.google Article · How Founders Use AI New agents, mobile apps and Gemini Omni for Google Flow and Google Flow Music Google In 4 answers
  3. One chart of which assistants people actually use, from a February 2026 survey. pewresearch.org Article · How Founders Use AI ChatGPT tops the list of chatbots Americans use, across age groups Pew Research Center In 4 answers
  4. Explains the three Pro plans (Pro 100, Pro 200, Pro 500) introduced in September 2026, so you know what the $100-plus tiers buy. help.openai.com Guide · How Founders Use AI About ChatGPT Pro tiers OpenAI Help Center In 4 answers
  5. Clickstream study through April 2026: AI platforms send 0.32% of all web traffic, ChatGPT about three quarters of it and Gemini... seranking.com Article · How Founders Use AI AI traffic grew 16x from 2024 to 2026: Here are the top AI search engines driving visits to websites SE Ranking In 4 answers
  6. OpenAI's own table of Free, Go, Plus and Pro: what each includes, from GPT-6 chats and memory to voice, projects and deep... chatgpt.com Tool · How Founders Use AI ChatGPT Plans and Pricing OpenAI In 4 answers
  7. How to start a Work task, what to put in the request, and how Scheduled Tasks repeat a job or watch for changes. help.openai.com Guide · How Founders Use AI ChatGPT Work and Codex OpenAI Help Center In 4 answers
  8. Sarvam's own account of its two open models, how it tests 22 languages in native and English-letter script, and why its... sarvam.ai Article · How Founders Use AI Open-sourcing Sarvam 30B & 105B models Sarvam AI In 4 answers
  9. Video · ~15 min · Starting Up Companies That Grow Without Ads (Delta-4 Theory) Kunal Shah (Founder, CRED) In 3 answers
  10. A PM-turned-founder's playbook that treats defining the right customer and problem as a sequence of concrete hurdles, not... First Round Review Article · ~18 min read · Starting Up 8 Product Hurdles Every Founder Must Clear First Round Review In 3 answers
  11. The fastest way to mine real customer complaints and comparisons about your competitors, the negative reviews are a free... G2 Tool · ongoing · Starting Up G2, software reviews and competitive comparison G2 In 3 answers
  12. The simplest way to build client portals and internal tools on top of Airtable, Notion, or Sheets. Low learning curve, fast to... softr.io Tool · platform · Starting Up Softr, Portals & Internal Tools, No Code Softr In 3 answers
  13. A high-signal, battle-tested framework for evaluating engineering talent from a leader who's done it hundreds of times.... First Round Review Article · ~20 min read · Starting Up My Lessons from Interviewing 400+ Engineers Over Three Startups Marco Rogers In 3 answers
  14. A crisp, visual reference of the psychology principles behind good UX, perfect for a founder who wants the 'why' without a... lawsofux.com Article · reference site · Starting Up Laws of UX Jon Yablonski In 3 answers
  15. A tight, example-driven breakdown of naming approaches from one of the best practical marketing writers online, memorable and... Marketing Examples Article · 5 min read · Starting Up Four (not boring) ways to name a new product Harry Dry In 3 answers
  16. A landmark Indian example of content-led growth, Zerodha built trust and a huge audience by teaching in public for free. The... Zerodha Varsity Article · Resource hub · Starting Up Varsity by Zerodha, learn to build an audience by teaching Zerodha In 3 answers
  17. Fifty-plus recent YC founders answer the exact question every early founder asks. The pattern across their answers is the lesson. YC Startup Library Article · ~10 min read · Starting Up Founder FAQ: How did you get your first customer? Y Combinator (50+ founders) In 3 answers
  18. A candid Q&A where a top sales founder answers real early-founder questions on outreach, persistence, and closing.... Stripe Atlas Guides Article · ~15 min read · Starting Up AMA with Steli Efti (Stripe Atlas) Steli Efti / Stripe Atlas In 3 answers
  19. The canonical explanation of why linear funnels break and self-reinforcing growth loops compound, from the team that trains... Reforge Blog Article · ~15 min read · Starting Up Growth Loops Are the New Funnels Brian Balfour & Reforge team In 3 answers
  20. The canonical book on making community a competitive advantage, from someone who trained community teams at Facebook, Airbnb,... Wiley Book · Book (~256 pages) · Starting Up The Business of Belonging David Spinks In 3 answers
  21. YC's Startup Library is the canonical, no-fluff reference on how startups actually make money, curated from partners who've... ycombinator.com Article · browsable library · Starting Up Business Models & Metrics, Y Combinator Startup Library Y Combinator In 3 answers
  22. David Sacks (PayPal, Yammer, Craft Ventures) distills the metrics that actually predict a SaaS company's health, including the... sacks.substack.com Article · essay · Starting Up The SaaS Metrics That Matter David Sacks In 3 answers
  23. Paul Graham's essays introduced the idea of 'ramen profitability' and default-alive thinking that underpins modern... paulgraham.com Essay · essay · Starting Up How to Make Wealth / Startup = Growth (essays) Paul Graham In 3 answers
  24. The strongest articulate case for NOT raising, from the 37signals co-founder who built a massively profitable business with... Lenny's Podcast / Lenny's Newsletter Podcast · 90 min · Starting Up Jason Fried challenges your thinking on fundraising, goals, and growth Lenny Rachitsky (host), Jason Fried (guest) In 3 answers

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