Griller does not interrogate you. It first turns a rough idea into 12 core decisions, then bakes the PRD and vertical-slice implementation prompts into one Blueprint.
“An app that helps solo travelers save places and plan an easy day route”
Instead of planning an entire trip, focus on arranging 3–7 places the user already saved into one day route.
You do not need to write a planning document. Griller structures the product decisions first and makes every deliverable use the same confirmed decision set.
The 12 free decisions remain inside Auto's 45 and Refined's 60. Existing values stay in place while only the decisions needed for more depth are added.
The most important core decisions
Standard product decisions + deliverables
Deep decisions + selective refinement
We do not hide unsupported assumptions inside a polished PRD. Every recommendation includes its reason, confidence, impact, source, and connections.
One confirmed decision set produces the PRD and 6–8 Auto or 9–12 Refined vertical-slice implementation prompts. Copy only the slice you need and hand it straight to your agent.
When a user selects 3–7 places, suggest a visit order and show it in both a map and a list.
Includes the problem, users, scope, flows, constraints, success criteria, tests, risks, and open questions.
Auto creates 6–8 and Refined creates 9–12 reviewable units of user value in build order.
Copy one prompt or download the full package for the coding agent you prefer.
No subscription and no credits. Review the free result first, then choose only the depth you need.
Start here to see what you enter, what you receive, and how the free and paid options differ.
Enter one idea and review the 12 most important product decisions first.