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. What Notion AI does across a workspace: writing, search across connected apps, agents and meeting notes. notion.com Tool · How Founders Use AI Notion AI Notion
  2. Notion's bot-free meeting recorder, which writes summaries and action items into your workspace. notion.com Tool · How Founders Use AI AI Meeting Notes Notion
  3. The official Gemini app, with more than 1 billion downloads. play.google.com Tool · How Founders Use AI Google Gemini on Google Play Google LLC
  4. The official ChatGPT app, with more than 1 billion downloads and in-app plan purchases. play.google.com Tool · How Founders Use AI ChatGPT on Google Play OpenAI
  5. The official Claude app, with more than 50 million downloads. play.google.com Tool · How Founders Use AI Claude by Anthropic on Google Play Anthropic
  6. The official Perplexity app, with more than 10 crore (100 million) downloads. play.google.com Tool · How Founders Use AI Perplexity on Google Play Perplexity AI
  7. Meta's standalone assistant app, with more than 100 million downloads; the same assistant is built into WhatsApp. play.google.com Tool · How Founders Use AI Meta AI on Google Play Meta
  8. Perplexity's AI browser for Mac, Windows, iPhone and Android, for research and errands across tabs. perplexity.ai Tool · How Founders Use AI Comet Perplexity
  9. A digital worker that browses, researches and builds in the background, including recurring tasks. perplexity.ai Tool · How Founders Use AI Perplexity Computer Perplexity
  10. The regulator's searchable list of registered investment advisers, 1,077 as of 9 November 2026: check any adviser here before... sebi.gov.in Tool · How Founders Use AI SEBI register of Investment Advisers SEBI
  11. DeepL's paid plans: Individual EUR 7.49 a month billed yearly with 300,000 characters and 3 file translations a month, Team EUR... deepl.com Tool · How Founders Use AI DeepL Pro plans DeepL
  12. Google's free Android app that writes speech as text in real time in over 80 languages and dialects, with custom words for... play.google.com Tool · How Founders Use AI Live Transcribe and Sound Notifications Google
  13. OpenAI's open-source speech recognition model, which you install and run on your own machine, so a confidential recording never... github.com Tool · How Founders Use AI Whisper OpenAI (open source)
  14. Adobe's free browser editor for text boxes, comments, highlights, form fields and signatures; changing existing text needs... adobe.com Tool · How Founders Use AI Free online PDF editor Adobe
  15. An open-source PDF editor with 60+ tools that runs on your own machine or server, for people who do not want sensitive files on... stirling.com Tool · How Founders Use AI Stirling PDF Stirling
  16. A free, open-source desktop app that splits, merges, rotates, mixes and extracts pages on your own computer, with no watermarks... pdfsam.org Tool · How Founders Use AI PDFsam Basic PDFsam
  17. Adobe's free online merge tool; the page states files are handled on Adobe's servers and deleted unless you sign in to save them. adobe.com Tool · How Founders Use AI Merge PDFs for free Adobe
  18. Adobe's free online splitter for dividing one PDF into several files in the browser. adobe.com Tool · How Founders Use AI Split PDF files for free Adobe
  19. The free Basic plan covers the essential tools with limited processing; Premium is 500 INR billed monthly or 2,900 INR a year,... ilovepdf.com Tool · How Founders Use AI iLovePDF pricing iLovePDF
  20. Apple's free editor for iPhone and iPad, for joining clips, adding titles and music. apps.apple.com Tool · How Founders Use AI iMovie on the App Store Apple
  21. A free, open-source AI image upscaler for Linux, macOS and Windows that runs on your own computer. github.com Tool · How Founders Use AI Upscayl Upscayl (open source)
  22. 10 free credits on sign-up with a watermark on free results; Starter is $9 a month billed annually ($12 monthly) for 100 credits. letsenhance.io Tool · How Founders Use AI Let's Enhance pricing Let's Enhance
  23. A Mac recorder for product demos that handles zooms, motion and framing; $29 a month or $9 a month billed yearly. screen.studio Tool · How Founders Use AI Screen Studio Screen Studio
  24. Adobe's free online PDF to DOCX converter. Your file is handled on Adobe's servers and deleted unless you sign in to save it. adobe.com Tool · How Founders Use AI Convert PDF to Word for free Adobe

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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
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