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. 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
  2. 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
  3. 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
  4. Gupshup is one of Meta's largest India-focused BSPs and the most technical/flexible option for higher-volume senders, this... Gupshup Article · D2C The Ultimate Guide to WhatsApp Business API Gupshup In 2 answers
  5. The best global reference for SMS specifically, useful for the transactional/OTP fallback layer that still matters even in a... Klaviyo Article · D2C The Complete SMS Marketing Guide for Campaign Success Klaviyo In 2 answers
  6. A rare pricing comparison that actually breaks down BSP platform fees separately from Meta's per-conversation charges, which is... Codingclave Article · D2C WhatsApp API Pricing India 2026: Audited Costs From Rs 0/mo Codingclave In 2 answers
  7. A direct, practical head-to-head on the two tools founders ask about most, useful as the tie-breaker once you've narrowed your... Neogen Media Article · D2C WhatsApp Business API Agency Guide: Wati vs AiSensy Neogen Media In 2 answers
  8. A comprehensive, current D2C-specific guide covering setup through automation through compliance in one place, a good... Hawknest Article · D2C WhatsApp Marketing for D2C Brands: The Complete 2026 Guide Hawknest In 2 answers
  9. Makes the strongest ROI case for prioritising WhatsApp with concrete India performance figures, useful ammunition if you need... iMark Infotech Article · D2C WhatsApp Business Marketing in India: The Channel Driving 11x ROAS Most Brands Still Underuse iMark Infotech In 2 answers
  10. Written specifically for D2C sellers rather than generic taxpayers, it walks through the exact mistakes that block a first... ITRnGST Article · D2C The E-commerce & D2C GST Guide (2026): Registration, TCS & Refund Wins ITRnGST In 2 answers
  11. Shopify's own India tax documentation is the most direct answer for a founder building on Shopify specifically: what GST does... Shopify Help Center Article · D2C GST in India FAQ Shopify In 2 answers
  12. The one resource that goes past 'GST is mandatory' into the operational reality of quick commerce: separate GSTIN or APOB... Tax Garden Article · D2C GST and Compliance Guide for Blinkit, Swiggy Instamart, and Zepto Sellers (2026) Tax Garden In 2 answers
  13. Covers the one real exception to 'GST from order one': Meesho's Enrolment ID route for specific exempted categories under the... Gonukkad Article · D2C How To Sell On Meesho Without GST in 2025 Gonukkad In 2 answers
  14. The official onboarding document handed to every newly registered taxpayer, worth reading once end to end so you know exactly... GST Portal, Government of India Report · D2C Welcome Kit for New Taxpayers GST Portal, Government of India In 2 answers
  15. 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
  16. 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
  17. The Ken's Daybreak team unpacks GST 2.0, the biggest rewrite of the tax founders are registering into in 2026, in plain audio... The Ken (Daybreak) Podcast · D2C All You Need to Know About GST 2.0 The Ken (Daybreak) 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 clearest explanation of the fork in the road: some applicants get simple OTP based Aadhaar authentication, others get... IndiaFilings Article · D2C Aadhaar and Biometric Authentication for GST Registration IndiaFilings In 2 answers
  20. This is the actual GSTN checklist, a one-page table listing every document category, the exact file type and size limit (JPG or... GST Tutorial Portal (GSTN) Report · D2C Check-list of Documents Required For GST Registration Goods and Services Tax Network (GSTN) In 2 answers
  21. This is the actual CBIC circular that tells GST officers exactly which documents they are and are not allowed to demand, so it... CBIC, Ministry of Finance, Government of India (via PIB) Report · D2C Instruction No. 03/2025-GST: Instructions for processing of applications for GST registration Shrunkhala Kangale, Deputy Secretary, CBIC In 2 answers
  22. 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
  23. 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
  24. The contrarian case, worth reading precisely because it argues composition can protect early cash flow. Stress test our 'skip... TaxGuru Article · D2C GST Composition Scheme as a Growth Tool for B2C and D2C Startups TaxGuru In 2 answers

Show the next 24

The hubs

eChai Partner Brands The partnership →