"Make something people want"
Y Combinator's investment thesis centers on finding founders who can execute rapidly and demonstrate clear evidence of product-market fit. They prioritize startups that show measurable traction, even at small scale, because early growth patterns often predict future success. YC believes strongly in the power of determined founders who can iterate quickly based on user feedback.
"The most successful founders are the ones who are most determined, not the ones who are most brilliant."
Key Investment Principles
Talk to Users
Direct user feedback trumps market research. YC founders are expected to have deep, ongoing conversations with customers.
Launch Fast
Ship a minimum viable product quickly and iterate. Perfectionism is the enemy of progress.
Do Things That Don't Scale
Early-stage startups should focus on manual, high-touch approaches before automating.
Focus on Growth
Week-over-week growth is the primary metric. 5-7% weekly growth is considered good for YC startups.
What They Look For
- Founders with deep domain expertise or unique insight
- Evidence of rapid iteration and learning
- Clear, measurable traction metrics (users, revenue, engagement)
- Large addressable market (but niche entry point is fine)
- Technical founders who can build independently
- Determination and resilience in founders
- Speed of execution and decision-making
Red Flags
- Founders who haven't talked to potential customers
- Overly complex products without clear user value
- Founders focused on fundraising over building
- Inability to articulate weekly growth metrics
- Co-founder conflicts or unclear equity splits
- Slow decision-making or analysis paralysis
Scoring Dimensions
Evidence of grit, resilience, and ability to overcome obstacles
Measurable user/revenue growth and engagement metrics
Total addressable market potential, even from niche starting point
Clear articulation of what you're building and for whom
Evidence of rapid shipping, iteration, and learning
Look up these terms in the glossary
Plain-English definitions for the jargon Y Combinator investors lean on most.
Glossary terms that point to this page
Other glossary entries link back to Y Combinator through their related terms, jump straight to the definitions that reference this framework.
Pitch deck pillar pages
How Y Combinator weighs each of the slides investors weigh hardest, long-form deep dives.
Investment Profile
Technical founder with domain expertise who ships fast and talks to users obsessively
$500K for 7% equity (standard YC deal)
Fix the deck before you send it.
Use the framework, slide template, self-audit worksheet, and fully scored example to rebuild your deck. One-time purchase, no subscription.
- Slides Template with 14 investor-ready layouts
- Self-Audit Worksheet with 10 checkpoints
- Framework brief and a fully scored Crestline example