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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. Canva's own image model, in the editor and through its API, with editable outputs and accurate text in images. canva.com Article · How Founders Use AI Introducing Canva Craft Canva
  2. Current per-token prices for every GPT-6 tier, with cached input and batch rates side by side. developers.openai.com Tool · How Founders Use AI API pricing (OpenAI docs) OpenAI
  3. Anthropic's cheap, fast tier for classification and routing, about 75% cheaper to run than Haiku 4.5, plus a cut to cache-read... anthropic.com Article · How Founders Use AI Introducing Claude Haiku 5.5 Anthropic
  4. OpenAI says it nearly matches GPT-6 Astra at a fifth of the price, with cached input at $0.10 per million tokens. openai.com Article · How Founders Use AI Introducing GPT-6.1 Sol OpenAI
  5. Anthropic's own guide to which Claude model to start with, with prices and what each tier is for. platform.claude.com Guide · How Founders Use AI Models overview (Claude docs) Anthropic
  6. How OpenAI's everyday and cheap tiers relate to GPT-6 Astra, and why it halved their API prices. openai.com Article · How Founders Use AI Introducing GPT-6 Sol and Luna OpenAI
  7. Google's flagship model page; its pricing page shows the lower introductory rate that ends on 30 November 2026. ai.google.dev Guide · How Founders Use AI Gemini 4 Argon (Gemini API docs) Google
  8. Reports the 16 Jul 2026 rename of NotebookLM to Gemini Notebook, so the older NotebookLM guides here still make sense. androidauthority.com Article · How Founders Use AI Google's handy NotebookLM tool is dropping the worst part of its name Taylor Kerns (Android Authority)
  9. Explains what the EU's labelling rules mean for marketing: AI product images and CEO avatar videos count as deepfakes, and... ictrecht.nl Article · How Founders Use AI Heads up! AI Act transparency obligations now in effect ICTRecht
  10. How browser agents read a page (screenshots, HTML, the accessibility tree) and what to change so they can use your forms and... web.dev Guide · How Founders Use AI Build agent-friendly websites Kasper Kulikowski and Omkar More (web.dev)
  11. Google's 15 October 2026 changes to AI Mode and AI Overviews: more inline links higher up, a test of an official-sites section,... blog.google Article · How Founders Use AI More ways to connect with the web from Search Hema Budaraju (Google)
  12. A preregistered experiment with 1,100 real Google users: forcing AI Mode cut clicks to outside sites by 18.8 points, and... arxiv.org Article · How Founders Use AI AI in Search Reduces Publisher Referrals Without Improving User Experience: Experimental Evidence Wang, Gleason, Bart, Wilson and Metaxa (Northeastern and Penn)
  13. What GA4's AI Assistant channel (added 13 May 2026) counts, what it misses, and how to build a channel group that does not... searchenginejournal.com Guide · How Founders Use AI How To Track AI Traffic In GA4 Without Undercounting It Itamar Blauer (Search Engine Journal)
  14. Google's Universal Cart, live in the US from 15 October 2026 across Search and the Gemini app, with checkout through the... blog.google Article · How Founders Use AI An intelligent new shopping cart Google
  15. Why OpenAI moved away from Instant Checkout, with its own statement, and what that means for merchants. digitalcommerce360.com Article · How Founders Use AI OpenAI shifts checkout plans in its agentic commerce strategy Digital Commerce 360
  16. Meta's post on its ads MCP server and CLI: report, create and edit campaigns from the AI tools you already use, with a July... facebook.com Article · How Founders Use AI Introducing Meta Ads AI Connectors: Manage Your Meta Ads From the AI Tools You Already Use Meta
  17. What Google's 5 August notice said: which Search campaigns moved to AI Max on 1 September and which settings come on by default. ppc.land Article · How Founders Use AI Google Ads broad match campaigns face AI Max auto-upgrade on September 1 PPC Land
  18. Includes 'the competitor spy', a prompt that has an agent sign up for your top three competitors and report every new feature... x.com Thread · How Founders Use AI 9 cool GPT 6 Astra prompts worth trying Greg Isenberg
  19. What Work is (an agent for longer jobs that end in a spreadsheet, report or presentation), which plans include it and how its... help.openai.com Guide · How Founders Use AI ChatGPT Work and Codex OpenAI
  20. The launch of Claude in a Sheets sidebar: formulas, pivot tables, native charts, and Python for joins and cleanup written back... claude.com Article · How Founders Use AI Claude now works with Google Docs, Sheets, and Slides Anthropic
  21. OpenAI's own guide to its spreadsheet sidebar: who gets it, how to install it, and the review steps it asks you to follow. help.openai.com Guide · How Founders Use AI ChatGPT for Excel and Google Sheets OpenAI
  22. Google's note that each cell Gemini fills from the web now shows its source, so you can check the values before using them. workspaceupdates.googleblog.com Article · How Founders Use AI Fill with Gemini now provides cell-level citations for web sources and supports larger requests Google Workspace Updates
  23. The launch of Claude Dashboards: connect BigQuery, Snowflake, Databricks or Salesforce, ask in plain words, and get a dashboard... claude.com Article · How Founders Use AI Build live dashboards and animate explainers with Claude Anthropic
  24. A BI founder on why cheaper answers create more follow-up questions for someone with data in their title, and why agents may do... benn.substack.com Article · How Founders Use AI How to find insights Benn Stancil

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