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. Purpose-built specifically for product-drop waitlists, not generic SaaS launches, so it handles the countdown, early-access... LaunchList Tool · D2C LaunchList - Waitlist Software for Ecommerce & Product Drops LaunchList In 2 answers
  2. One of the more established Amazon/marketplace ad-automation platforms, positioned for brands who want hands-off bid management... Perpetua Tool · D2C Perpetua, Ecommerce Advertising Software Perpetua In 2 answers
  3. A major third-party inspection firm's own AQL explainer and calculator, useful both to learn the standard and to see who you... qima.com Tool · D2C Acceptable Quality Limit, AQL QIMA In 2 answers
  4. A more managed onboarding route for founders who don't want to navigate the ONDC registry/seller-app landscape solo, worth... SellerApp Tool · D2C ONDC Seller Registration, Pathway to Trustworthy Digital Commerce SellerApp In 2 answers
  5. Cashfree's own live pricing page, broken out by payment method (cards, UPI, net banking, EMI, international cards), the fastest... cashfree.com Tool · D2C Payment Gateway Charges: Lowest Pricing & UPI Payment Gateway Fees in India Cashfree In 2 answers
  6. A working Indian private-label cosmetics manufacturer's own site, useful both as a resource and as a live example of what a... hcpwellness.in Tool · D2C Private Label & Third Party Cosmetic Manufacturer India HCP Wellness In 2 answers
  7. Free, structured courses on product development and manufacturing logistics, a good weekend crash course before your first... shopify.com Course · D2C Develop and Manufacture Products (Shopify Learn) Shopify In 2 answers
  8. A privacy-compliant, statistically grounded alternative to pixel-based attribution, worth understanding even if you don't buy... Triple Whale Tool · D2C AI-Powered MMM Platform for Ecommerce Growth Triple Whale In 2 answers
  9. A literal checklist, not a wall of theory, written by the platform most Indian D2C brands actually run on, so every tip maps... shopify.com Template · D2C SEO Checklist: 50 Tips to Optimize Your Online Store Shopify In 2 answers
  10. A multi-carrier orchestration layer built for exactly the problem scaling Indian brands hit, unifying tracking, NDR and EDD... ClickPost Tool · D2C ClickPost, Post-Purchase Experience Platform ClickPost In 2 answers
  11. The most concrete India-specific breakdown of what a returned COD order actually costs - forward + reverse shipping, packaging,... hillteck.com Tool · D2C True Cost of RTO for Indian D2C Brands: Formula + Calculator HillTeck In 2 answers
  12. One of the leading India-first 3PLs built specifically for D2C, marketplace and quick-commerce fulfillment together, its 20+... WareIQ Tool · D2C eCommerce Fulfillment India: 3PL for D2C, Marketplace & Quick Commerce WareIQ In 2 answers
  13. An India-based, official WhatsApp Business Solution Provider with a genuinely free forever tier, a low-risk way to test... AiSensy Tool · D2C AiSensy, Smartest WhatsApp Marketing Platform AiSensy In 2 answers
  14. The most direct Shopify-to-WhatsApp bridge available, auto-syncs your catalog and turns WhatsApp carts into real orders, the... Interakt Tool · D2C WhatsApp Commerce, Setup WhatsApp Store & Sell Online (Interakt) Interakt In 2 answers
  15. Built specifically around automation triggers, cart recovery, promotional broadcasts, customer segments, on the official API,... Wigzo Tool · D2C WhatsApp Marketing (Wigzo) Wigzo In 2 answers
  16. A ready GST compliant invoice format, with CGST, SGST, IGST, and HSN fields already built in, so your first invoice does not... Wise Template · D2C GST Bill Format and Invoice Format Wise In 2 answers
  17. A free, step by step walkthrough of the actual registration screens for e-commerce sellers, useful if you would rather watch... Udemy Course · D2C Free Goods and Services Tax (GST) Tutorial: New GST Registration Process 2025 & Shipping Bill under GST Udemy In 2 answers
  18. The single most useful thing to print out before you start: a checklist by business constitution so you gather every document... ClearTax Template · D2C GST Registration Documents Required: Complete List for 2026 ClearTax In 2 answers
  19. The official portal's own reference tool, broken out by taxpayer category (normal taxpayer, non-resident, GST practitioner and... GST Portal (gst.gov.in) Tool · D2C GST Document Advisor: Documents Required for New Registration Application Goods and Services Tax Network (GSTN) In 2 answers
  20. The fastest way to solve the GST portal's tight 100 KB to 1 MB upload limits when a phone-scanned document comes out too large,... iLovePDF Tool · D2C Compress PDF online, same PDF quality less file size iLovePDF In 2 answers
  21. The workflow layer most performance teams use on top of the raw Ads Library, for saving, tagging and briefing creative that is... Foreplay Tool · D2C Foreplay.co Foreplay In 2 answers
  22. Meta's own free training portal, the closest thing to a structured curriculum on how its ad products actually work, straight... Meta Blueprint Course · D2C Browse free courses from the Blueprint catalog Meta Blueprint In 2 answers
  23. A free, no login spreadsheet template for running structured creative tests, useful before you can justify paying for a tool... GrowthFullStack Template · D2C How to automate your creative testing for free in Google Spreadsheets GrowthFullStack In 2 answers
  24. Most guides stop at it's connected. This one is for the founder who wants to know if it's connected well. Meta Blueprint Course · D2C Optimize Meta Conversions API Meta Blueprint In 2 answers

Show the next 24

The hubs

eChai Partner Brands The partnership →