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. Video · How Founders Use AI Dara Denney Reveals the Biggest Creative Analysis Mistake Dara Denney
  2. Video · How Founders Use AI Performance Creative: Velocity, AI Tooling, and the Paid-Organic Relationship with Dara Denney Dara Denney (interview)
  3. Mainstream verification of the most cited small-team, big-spend AI app story. cnbc.com Article · How Founders Use AI 18-year-old CEO's calorie app Cal AI makes $1.4 million a month CNBC
  4. The full arc from teen side project to exit, including the paid growth engine. inc.com Article · How Founders Use AI He Built an AI App in High School, Made $40 Million, and Sold to MyFitnessPal Inc. (Ben Sherry)
  5. Breaks the growth playbook into replicable steps: creator network, paid, and retention. superframeworks.com Article · How Founders Use AI Cal AI Case Study: $0 to $50M+ ARR in 18 Months Superframeworks
  6. Dissects the 250-creator native-content engine behind Cal AI's paid TikTok machine. stormy.ai Article · How Founders Use AI The Cal AI TikTok Marketing Playbook: Scaling to $2M/Month Stormy AI
  7. Focuses on the AI tooling side of the same story for builders on a budget. metaschool.so Article · How Founders Use AI How 17-Year-Old Zach Used ChatGPT to Build Cal AI to $1M/mo Metaschool
  8. Bootstrapped founder explains the paid, sales, and influencer channels behind $10M ARR in 20 months. open.spotify.com Podcast · How Founders Use AI From $5K to $10M ARR: The ArcAds Founder's Playbook SaaS Interviews (feat. Romain Torres)
  9. Candid detail on running a lean AI ads company and the product ideas it surfaced. open.spotify.com Podcast · How Founders Use AI Romain Torres (Arcads AI): Growing to $7M ARR in 18 Months The Manav Podcast
  10. Video · How Founders Use AI $200K/mo with ONE AI Ad (We tell you HOW) Greg Isenberg (The Startup Ideas Podcast)
  11. Shaan and Sam break down the leanest AI-powered growth stories in consumer apps. mfmpod.com Podcast · How Founders Use AI The AI App Doing $6M With 1 Employee My First Million
  12. What AI avatars change about who can afford creator-style paid campaigns. open.spotify.com Podcast · How Founders Use AI How AI Influencers Are Replacing Human Creators (Romain Torres) Superhuman AI podcast
  13. The clearest picture of an agent-heavy, human-light marketing org actually running. intelligentartifice.net Podcast · How Founders Use AI This AI video startup founder scaled to 7 figures with more agents than employees Intelligent Artifice (feat. Romain Torres)
  14. Video · How Founders Use AI The Startup Automating 1,000+ Ads a Week (Romain Torres, Arcads) Work In Progress Podcast
  15. A solo operator's real numbers: 12 retainers on an under-$500/month AI stack. medium.com Article · How Founders Use AI One-Person Agency, 10x Output: How Solo Marketers Use AI to Scale Unkoa Marketing
  16. The counterweight: where the small-team AI stories still depend on human judgment. foxwelldigital.com Article · How Founders Use AI Why AI in Performance Marketing Still Needs Great Humans Foxwell Digital
  17. Three operators running big DTC budgets share exactly how lean AI-era teams are structured. podcasts.apple.com Podcast · How Founders Use AI Marketing Operators podcast Cody Plofker, Connor MacDonald, Connor Rolain
  18. How small DTC teams cut video production costs ~60% while scaling YouTube spend. adgpt.com Article · How Founders Use AI YouTube Ads AI: Scale DTC Creative Without Fatigue AdGPT
  19. Compares the analysis layer of the stack: Motion, Foreplay, Atria and more. tryatria.com Article · How Founders Use AI 7 Best AI Ad Tools for Creative Analysis in 2026 Atria
  20. Turns saved ad inspiration into storyboarded briefs your editor or AI tool can execute. foreplay.co Tool · How Founders Use AI Foreplay AI Briefs Foreplay
  21. Frames why founders should rebuild marketing around AI workflows, not headcount. x.com Thread · How Founders Use AI Vibe coding transformed dev cycles; vibe marketing is next Greg Isenberg
  22. All workflows, prompts, and tools in one 30-minute crash course. x.com Thread · How Founders Use AI The COMPLETE guide to MARKETING with AI (vibe marketing 101) Greg Isenberg
  23. The literal tool list a well-known operator runs, useful as a starting template. gralio.ai Article · How Founders Use AI Greg Isenberg's vibe marketing software stack Gralio
  24. Practical picks segmented by team size, including solo-founder-friendly options. marketerhire.com Article · How Founders Use AI Top 12 AI Marketing Tools Every Marketer Needs MarketerHire

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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