Before
A browser extension that auto-summarizes long email threads for busy executives
After
CA Chrome extension that adds a 'Summarize Thread' button to Gmail, providing 3-bullet summaries that capture decision history and conversation flow rather than just individual emails. Initially targeting product managers at 50+ person companies who spend significant time preparing for meetings by reading email thread context.
Per-question score table
Who is this for, very specifically?
Needs a sharper customer, proof point, and next test.
What pain are they paying for today?
Needs a sharper customer, proof point, and next test.
Why now? What changed in the world?
Needs a sharper customer, proof point, and next test.
What's the V1 you can build in 4 weeks?
Needs a sharper customer, proof point, and next test.
How will you reach the first 100 users?
Needs a sharper customer, proof point, and next test.
What does success look like at month 6?
Needs a sharper customer, proof point, and next test.
Homework
Three concrete next steps before you run the next session.
- 1Interview 5 PMs at different companies this week: ask how much time they spend on email prep and if they've ever paid for email tools
- 2Document exactly when and why people need thread context: record 10 specific instances where you used thread history before meetings
- 3Research and explain 3 recent changes (AI capabilities, remote work, email volume) that make this solution more viable now than 2 years ago
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
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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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