Find & validate your idea

Find a problem worth solving, then prove people want it before you build.

What founders use for find & validate your idea, ranked by how many answers lean on it.

  1. The single best thing ever written on customer conversations. It teaches you to ask about the customer's life and past... momtestbook.com Book · ~130 pages The Mom Test Rob Fitzpatrick In 76 answers
  2. The definitive essay on where good ideas come from: notice problems you personally have, don't force it. Use it as the lens for... paulgraham.com Essay · ~20 min read How to Get Startup Ideas Paul Graham In 74 answers
  3. The essay that put 'product-market fit' into the startup vocabulary. Read it for the gut-level description of what PMF feels... pmarchive.com Essay · ~15 min read The Only Thing That Matters Marc Andreessen In 39 answers
  4. Turns the vague feeling of product-market fit into a number you can move. Ask users how they would feel if they could no longer... First Round Review Article · ~20 min read How Superhuman Built an Engine to Find Product/Market Fit Rahul Vohra In 32 answers
  5. The permission slip to recruit users by hand, do things manually, and deliver 'insanely great' experiences to your first few... paulgraham.com Essay · ~15 min read Do Things That Don't Scale Paul Graham In 26 answers
  6. Entering an unfamiliar industry means you cannot see the walls and dead ends that veterans already know. Dixon explains that a... cdixon.org Essay · short read The Idea Maze Chris Dixon In 22 answers
  7. Thiel pushes you to look for ideas hidden in plain sight by asking what important truth very few people agree with you on. It... Peter Thiel and Blake Masters Book · About 220 pages Zero to One Peter Thiel and Blake Masters In 20 answers
  8. The origin text for the modern MVP and validated-learning vocabulary every founder now uses. Read it for the mental model that... theleanstartup.com Book · ~330 pages The Lean Startup Eric Ries In 15 answers
  9. Todd Jackson studied how dozens of now-large companies validated their very first idea. The pattern that repeats: deliver the... Lenny's Newsletter Article · ~15 min read How to Validate Your Startup Idea Todd Jackson In 15 answers
  10. The definitive short read on why disruptive ideas get dismissed as toys, and why that dismissal is your opening. It reframes... cdixon.org Article · ~5 min read The Next Big Thing Will Start Out Looking Like a Toy Chris Dixon In 13 answers
  11. Before you sweat which side to seed, Gurley helps you judge whether your marketplace is even structurally worth building. He... Above the Crowd Essay · 20 min read All Markets Are Not Created Equal: 10 Factors to Consider When Evaluating Digital Marketplaces Bill Gurley In 13 answers
  12. Most market sizing advice online is generic TAM SAM SOM filler. This one is written by an investor, backed by a survey of 30... Pear VC Essay · ~15 min read Market Sizing Guide Ian Taylor In 12 answers
  13. Thiel makes the counterintuitive case that dominating a tiny market first is a feature, not a bug: every lasting monopoly... Penguin Random House India Book · ~224 pages Zero to One: Notes on Startups, or How to Build the Future Peter Thiel with Blake Masters In 12 answers
  14. The cleanest distillation of the one framework that turns a customer chat into a relationship instead of a survey. The three... Sachin Rekhi's Blog Article · 10 min read A Primer on Talking to Customers From Rob Fitzpatrick's The Mom Test Sachin Rekhi In 12 answers
  15. Lenny interviewed founders of Gong, Notion, Figma, Amplitude, Retool and more to trace where their idea actually came from. The... Lenny's Newsletter Article · About 15 min read How the Most Successful B2B Startups Came Up With Their Original Idea Lenny Rachitsky In 12 answers
  16. A short, pointed essay on why the best ideas grow organically out of the founder's own life and knowledge, the essence of... paulgraham.com Article · ~5 min read Organic Startup Ideas Paul Graham In 10 answers
  17. Currier's whole argument is that founder-market fit is more than the one line on a resume that says 'domain expert'. He breaks... NFX Article · ~12 min read The 4 Signs of Founder-Market Fit James Currier In 10 answers
  18. Blume's annual report is the single best data-grounded read on what is actually happening in Indian internet and consumption,... Blume Ventures Article · ~180 charts Indus Valley Annual Report 2025 Sajith Pai, Anurag Pagaria and team (Blume Ventures) In 10 answers
  19. Altman's condensed operating manual for founders, including sharp guidance on focus, spending your time on what only you can... playbook.samaltman.com Article · long Startup Playbook Sam Altman In 8 answers
  20. Before you build for a home market outside the big startup hubs, you need the real economics, and this is the essay that maps... Sajith Pai (Blume Ventures) Article · ~20 min read The Indus Valley Playbook Sajith Pai In 8 answers
  21. Your first filter is whether this is a problem you understand, and this short essay is the clearest statement of why that... cdixon.org Essay · ~5 min read Founder/Market Fit Chris Dixon In 8 answers
  22. The definitive founder essay on why raw ideas are worth very little and why secrecy is the wrong instinct. Graham's argument... paulgraham.com Essay · ~15 min read Ideas for Startups Paul Graham In 7 answers
  23. When there is no category report to point at, you have to build the number yourself, and this is the essay that teaches you... Andreessen Horowitz Essay · ~20 min read 16 More Startup Metrics Anu Hariharan, Frank Chen, Jeff Jordan In 7 answers
  24. Once you are testing an idea, this piece gives you concrete signals that tell you whether it is actually working, from... Lenny's Newsletter Article · about 15 min read How to Know If You've Got Product-Market Fit Lenny Rachitsky In 7 answers

Show the next 24

The questions

Finding & shaping ideas 18

Find a problem worth years of your life.

I want to start a startup but I don't have an idea. Where do I even begin? 19 → How do I come up with startup ideas that aren't just 'Uber for X'? 19 → Should I solve a problem I personally have, or chase a bigger market? 19 → How do I know if my idea is a real problem or just a 'nice to have'? 19 → I have too many ideas. How do I pick which one to actually work on? 19 → All 18 questions in Finding & shaping ideas →
Validating your idea 21

Get evidence before you write code.

What does 'validating an idea' actually mean? 20 → How do I know if my idea is any good? 18 → How do I validate an idea without building anything? 18 → How do I talk to customers without getting false positives? 19 → How many people should I talk to, and how do I find them? 17 → All 21 questions in Validating your idea →
Market size & timing 18

Is it big enough, and why now?

How big does my market need to be for this to be a real business? 19 → What are TAM, SAM, and SOM and how do I actually calculate them? 18 → Why does 'why now?' matter so much for a startup idea? 17 → My market is small right now but growing fast. Is that a problem? 16 → How do I size a market for India specifically when data is messy? 19 → All 18 questions in Market size & timing →
Founder-market fit 17

Why you, and why this problem?

What is founder-market fit and how do I know if I have it? 18 → Do I need to be an expert in an industry to start a company in it? 19 → I'm passionate about an idea but have zero background in it. Should I still do it? 19 → How much does 'why you?' actually matter to investors and to success? 19 → As a woman founder, or one building outside the big startup hubs, how do I turn my background into an edge? 19 → All 17 questions in Founder-market fit →
Spotting trends & opportunities 18

Live in the future and build what's missing.

How do I spot trends early enough to build a startup on them? 20 → How do I tell the difference between a real trend and a passing fad? 20 → Everyone says the next big thing looks like a toy. What does that actually mean? 16 → Where do I look to find emerging opportunities before they're obvious? 19 → What are the biggest emerging opportunities in India right now? 18 → All 18 questions in Spotting trends & opportunities →
eChai Partner Brands The partnership →