Simple Pricing

Free to try. $19/mo to go deep.

No tricks. No hidden fees. Start free, upgrade when you need the full YC office hours experience.

Free

Quick Evaluation

$0/forever

What you get

1 evaluation per month
6 forcing questions
A-F grade card
Public shareable URL
OG card for Twitter/Threads
Push back / follow-up questions
Market research (web search)
Premise challenge
Alternative generation
Full design document
Private sessions
Session history
PDF/Markdown export
RECOMMENDED

Pro

Full Office Hours

$19/month

10 full sessions per month

Everything in Free, plus

10 full sessions per month
Unlimited push back (20 turns/session)
Market research with web search
Premise challenge & reframing
Alternative approach generation
Full design document output
Startup Mode or Builder Mode
Public or Private sessions
Session history & dashboard
PDF & Markdown export
Founder signal analysis
Personal Garry-style feedback

Side-by-side comparison

Feature
Free
Pro $19/mo
Sessions
1/month
10/month
6 Forcing Questions
Push Back
1 round
Unlimited (20 turns)
Market Research
Premise Challenge
Alternative Generation
Design Document
Grade Card
Social Sharing
Private Sessions
Session History
PDF/MD Export

Common questions

Is this the real gstack?

We use the same framework and forcing questions from Garry Tan's open-source gstack (58K stars, MIT license). This is a web interface for that methodology.

Do I need to sign up for the free version?

No. Just type your idea and get graded. We only ask for email if you want to save your result.

What does a Pro session include?

Everything: 6 questions with unlimited push-back, AI market research, premise challenge, alternative generation, and a full design document. Like having a YC partner grill you for 15 minutes.

Can I cancel anytime?

Yes. No contracts. Cancel in one click. Your existing sessions and results stay accessible.

What AI model do you use?

Claude Sonnet (Anthropic). The same class of model used in the original gstack CLI tool.

Still thinking? Start free.