Before
Solo founder idea validator with AI
After
BSolo founder idea validator with AI for a narrow first customer segment, packaged as a four-week V1 with a measurable pain and a clear first channel.
Per-question score table
Who is this for, very specifically?
Tight demographic, clear background, specific runway, narrow product category — testable.
What pain are they paying for today?
Pain is real and quantified, but the buying behavior link is unproven.
Why now? What changed in the world?
Real tailwinds named, but no evidence behavior has actually shifted yet.
What's the V1 you can build in 4 weeks?
Scoped tight, shippable, clear scope boundaries, realistic timeline with buffer.
How will you reach the first 100 users?
Hope-based distribution, no named founder, no fallback channel, untested message.
What does success look like at month 6?
Numbers are specific but the leap to Series A at $7.6K MRR is delusional.
Homework
Three concrete next steps before you run the next session.
- 1Interview 5 people in the exact customer segment and write down the painful workflow in their words.
- 2Build a four-week V1 outline that solves only the highest-friction step.
- 3Send one concise outreach message to 20 likely first users and measure replies.
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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Research this idea →
5-axis market analysis in Garry's voice
Brainstorm variations →
6-angle idea expansion