AI can't read your mind (yet).
A guided conversation about your idea - topic by topic. It finds the gaps in your thinking and produces a document you can build from.
Free spots are limited - no credit card needed.
Start with whatever you have - a sentence, a paragraph, a half-formed thought. No wrong answers. Sharpener meets you where you are.
Sharpener walks you through your idea topic by topic: users, features, scope, success criteria, edge cases. It finds the gaps in your thinking - the ones that would cost you hours later.
When you're done, export a structured Product Requirements Document. Paste it into Claude Code, Cursor, Lovable, or whatever you build with. Watch the difference a clear brief makes.
Someone typed one sentence. Here's what Sharpener did with it.
“A mobile app where users upload an image of their pantry and AI suggests meals they can make with the items available.”
One sentence. That's all Sharpener needs to start.
The questions you hadn't thought of yet:
Does it need to use ONLY what's visible in the photo, or can it assume pantry staples like salt, oil, and eggs? If it assumes wrong, the user is halfway through a recipe with no eggs.
How do you handle dietary restrictions? A recipe suggestion that ignores someone's allergy isn't a feature - it's a liability.
What about ingredients that are about to expire? Do you prioritize recipes that use the stuff going bad first - turning food waste into a feature?
Not convinced? Stress-test your thinking with 11 built-in techniques:
Shark Tank
“Supercook already lets you type in ingredients and get recipes. What does the PHOTO add that typing 'chicken, rice, broccoli' doesn't? Is the camera a real advantage or a gimmick that adds friction without adding value?”
## Executive Summary
A mobile-first app that turns a photo of your pantry into personalized meal suggestions - accounting for dietary restrictions, expiration priorities, skill level, and household size. Not just “what can I make” but “what SHOULD I make tonight.”
## User Types
Three distinct users with different needs: the weeknight scrambler (20 min or less, whatever's available), the meal prepper (use everything before grocery day), the dietary-restricted user (allergies, preferences, household conflicts)...
## Success Criteria
Recipe-tried rate >30% (user actually makes the suggestion). 7-day retention >40%. Average meals suggested per session: 3-5. Food waste reduction measurable via repeat pantry scans...
+ 6 more sections: Feature Set, Scope Boundaries, Domain Considerations, Innovation Analysis, Functional Requirements, Non-Functional Requirements
That started with one sentence. Imagine what your idea looks like after Sharpener.
“I really like how it's shaping my thinking.”
- Brian, building a game concept with Sharpener
“Really really good question btw”
- Brian, building a game concept with Sharpener
“That's appealing to me if it lets me drive decisions.”
- Brian, building a game concept with Sharpener
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Sharpener is built and funded by one person. The free tier has limits because I'm paying for the AI costs myself. If it's useful to you, subscribing keeps it going.
Today: software product briefs. Soon: games, books, courses, and anything else worth thinking through.