The real gstack
Garry Tan's product planning tool. 58K stars on GitHub. Now in your browser.
Free grade, Pro deep-dive
Get a free grade card instantly. Go Pro for market research, alternatives, and full design docs.
Share your grade
Get your A-F grade card. Share it on Twitter/Threads. Flex or learn.
Your idea might suck. Let's find out.
6 forcing questions. No hand-holding. No "great idea!" BS. Just the truth about whether your startup has legs.
01
Drop your idea
Type your startup idea. One sentence or a novel -- we don't care.
02
Get grilled
6 questions that expose whether there's real demand, real users, real timing.
03
Get your grade
A-F. No sugarcoating. Share it, or upgrade for the full deep-dive.
Simple pricing
Free to try. $19/mo to go deep.
Free
$0/forever
Quick Eval. 1 per month. Public only.
- 6 forcing questions
- A-F grade card
- Shareable public URL
- OG card for social
- Push back / follow-up
- Market research
- Design document
- Private sessions
RECOMMENDED
Pro
$19/month
Full Office Hours. 10 sessions/month.
- Everything in Free
- Unlimited push back (20 turns)
- Market research (web search)
- Premise challenge
- Alternative generation
- Full design document
- Public or Private
- Session history
- PDF/Markdown export