Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Munching Squares
With this app you can paint the pixels selected by the Munching Squares algorithm in black and white and/or color to make an almost infinite variety of lattices.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Munching Squares: map the core Graphics & Design workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Offer more diverse tools and templates for creating designs.
Assumption to check: Limited design tools compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate a community sharing feature for user designs.
Assumption to check: Lack of user feedback features
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear explanations and benefits for each subscription tier.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline mode for users to work without internet access.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
With this app you can paint the pixels selected by the Munching Squares algorithm in black and white and/or color to make an almost infinite variety of lattices. Munching Squares is a classic computer graphics program mentioned in the celebrated MIT AI Lab memo HAKMEM. It was originally written in a few instructions of machine language for the DEC (Digital Equipment Corporation) PDP-1 Computer equipped with a Type 30 CRT point plotting display. Some more technical detail: Each step by Munching Squares on an NxN square paints N pixels in a pattern that is simplest if toggle switch 0 is on and the rest are off. As long as toggle switch 0 is on, after N steps, all pixels in the square will have been painted in a pattern controlled by the toggle switches. In general, the top left and bottom right quarters of the pattern will be the same as will the top right and bottom left quarters. And this will be true within each quarter, and so on. If toggle switch 0 is off but toggle switch 1 is on, only half the pixels will be painted. If toggle switches 0 and 1 are off but toggle switch 2 is on, only a quarter of the pixels will be painted. And so on.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
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Zustand
react-native-reanimated
expo-image-picker
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
