Before
startup validation AI with Garry Tan
After
Bstartup validation AI with Garry Tan for a narrow first customer segment, packaged as a four-week V1 with one measurable pain, one acquisition channel, and a clear month-six success target.
Per-question score table
Who is this for, very specifically?
Specific persona with role, life stage, capital state, and a clear trigger moment.
What pain are they paying for today?
Clear budget number, but the "paying advisors" claim needs proof, not assertion.
Why now? What changed in the world?
"LLMs got good" applies to every AI startup; not a specific unlock for this idea.
What's the V1 you can build in 4 weeks?
Concrete stack, scoped feature set, aggressive timeline, correct sequencing on auth.
How will you reach the first 100 users?
Real channels and zero-spend is right, but "one tweet" assumes a favor you may not have.
What does success look like at month 6?
Hard numbers across revenue, users, and social proof — all measurable and falsifiable.
Homework
Three concrete next steps before you run the next session.
- 1Interview 5 people in the exact customer segment and write down the words they use for the painful workflow.
- 2Build a clickable V1 outline that solves only the highest-friction step from those interviews.
- 3Send one concise outreach message to 20 likely first users and measure replies, not likes.
What founders say about gstack
“gstack's forcing questions are sharper than most advisors I have paid for.”
@founder_a
“Used this to pressure-test our YC application. We got in.”
@yc_alum_b
“58K GitHub stars for a reason. The framework is legit.”
@indie_dev_c
“It saved me from building the wrong thing. Twice.”
@pm_dana
Your next step
Apply to YC
- 1.5% acceptance rate
- 3 to 6 months until the next batch
- One idea reviewed
- Weeks to hear back
Go Pro
- Start today, no waiting
- 10 idea evals every month
- Full results in 5 minutes
- Private sessions and history
$19 / month
Applying to YC is still worth it. Use Pro to sharpen the idea before you do.
Go Pro
$19/month for 10 Full Sessions, private results, session history, and homework follow-up emails.
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5-axis market analysis in Garry's voice
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6-angle idea expansion