Every resource founders actually use, in one library.

What founders use most, ranked by how many answers lean on it.

1. A free, no signup whiteboard with a deliberately hand drawn look, ideal for sketching screens and flows without falling into... Excalidraw Tool · Starting Up Excalidraw Excalidraw In 2 answers
2. When a developer needs to walk you through a feature but you are twelve hours apart, a short recorded screen video does what a... Loom (Atlassian) Tool · Starting Up Loom (asynchronous video updates) Loom (Atlassian) In 2 answers
3. This is a ready-to-use set of lightweight templates for recording why technical decisions were made, so the reasoning survives... GitHub (joelparkerhenderson) Template · Repo with templates · Starting Up Architecture Decision Records: Templates and Examples Joel Parker Henderson In 2 answers
4. A fast way to check whether a screen reads clearly in the first impression, which is often where clunky starts. Show people a... Five Second Test (Lyssna) Tool · Starting Up Five Second Test Five Second Test (Lyssna) In 2 answers
5. A finance-grade reference for the actual formulas, with a calculator so you can sanity-check your TAM, SAM, and SOM arithmetic.... Wall Street Prep Tool · Starting Up Market Sizing: Formula and Calculator Wall Street Prep In 2 answers
6. Riley spends dozens of hours per report distilling an emerging market into a five minute read with players, opportunities, and... trends.vc Tool · Starting Up Trends.vc Dru Riley In 2 answers
7. A ready to use version of the 40 percent very disappointed survey, so you can measure real attachment instead of guessing from... LearningLoop Template · quick setup · Starting Up Sean Ellis Product-Market Fit Survey Sean Ellis (framework) In 2 answers
8. If ONDC is your opening, this is the primary source for how the network actually works and how to join it, including... ONDC Tool · Starting Up ONDC (official network) ONDC In 2 answers
9. The official rules for posting to Hacker News's Show HN section, worth reading before you try this channel again: it tells you... Hacker News Tool · Starting Up Show HN Guidelines Y Combinator In 2 answers
10. Once you find your champion, the deal usually stalls on a security questionnaire, and do you have a SOC 2 report is often the... Vanta Tool · Starting Up An actionable guide to SOC 2 compliance for startups Vanta In 2 answers
11. This guide's central argument matches our answer exactly: most prospect lists fail at definition, not sourcing, so precision... Clay Tool · Guide + tool · Starting Up How to Build a Targeted Prospect List Clay In 2 answers
12. A short, free checklist you can hold next to your draft while writing your first cold email, not just the subject line but the... Josh Braun Template · Starting Up 15 Cold Email Copywriting Principles Josh Braun In 2 answers
13. Before you send a single cold email to a real prospect, send one to this tool. It gives you a spam score out of 10, checks your... mail-tester.com Tool · Starting Up Mail Tester mail-tester.com In 2 answers
14. A ready made list of open, past behavior questions you can literally bring into your next call, grouped so you're not... Indie Hackers Template · Starting Up 24 User Interview Questions you can use (free template too!) Joshua Tabansi In 2 answers
15. This is the practical way to act on the route around your inner circle entirely part of your short answer: it is a marketplace... Respondent.io Tool · Starting Up Respondent Respondent.io In 2 answers
16. This is a genuinely usable, free spreadsheet template plus a five step process for writing down your ICP with real specificity... Notion Capital Template · Starting Up Get uncomfortably narrow with an Ideal Customer Profile template Notion Capital In 2 answers
17. The actual front door, register-now button, fee structure, category list. Everything else in this pool is commentary on what... sell.amazon.in Tool · D2C Amazon Seller, Sell Your Products Online on Amazon India Amazon In 2 answers
18. A free, official Amazon tool that surfaces real demand and gap data pulled directly from Amazon's own search and purchase... Sell on Amazon Tool · D2C Product Opportunity Explorer Amazon In 2 answers
19. A free, structured course to get a Shopify store from zero to its first sale fast - the cheapest way to test whether Shopify's... shopifyacademy.com Course · D2C First Day To First Sale Shopify Academy In 2 answers
20. Combines duty and GST/IGST into a single estimate, useful as a second opinion when your DutyDecoder or ICEGATE numbers need a... seair.co.in Tool · D2C Customs Duty Calculator with GST Seair Exim In 2 answers
21. A cohort-and-retention analytics platform purpose-built for Shopify/Amazon DTC brands - RFM, cohort revenue and cohort... 1800dtc.com Tool · D2C Peel Overview 2026: Used By 50 Brands 1-800-D2C In 2 answers
22. One of the most-used Shopify affiliate/referral/ambassador tools among fast-growing global DTC brands - it turns customers and... socialsnowball.io Tool · D2C Social Snowball - Influencer, Affiliate & Referral Platform for DTC Social Snowball In 2 answers
23. Founded in Pune and grown into a genuinely global loyalty platform, Zinrelo is the Indian-origin option that scales past a... zinrelo.com Tool · D2C Zinrelo - Loyalty Platform for CPG, Retail, and DTC Brands Zinrelo In 2 answers
24. Straight from the platform, so it stays current as Shorts format rules change (length caps, editing tools, monetisation). The... youtube.com Tool · D2C Create Shorts on YouTube YouTube for Creators In 2 answers

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