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
Drawing Grid
Drawing Grid helps artists transfer proportions from a reference image to paper or canvas.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
18 ratings · Top 30%
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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 Drawing Grid: map the core Photo & Video 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
Include more brushes, textures, and shapes.
Assumption to check: Limited drawing tools compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud storage for saving and retrieving drawings.
Assumption to check: No cloud backup of drawings
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with more themes and customization settings.
Assumption to check: Basic UI with minimal customization options
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance for handling larger canvases and complex drawings.
Assumption to check: Performance issues with larger drawings
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
Drawing Grid helps artists transfer proportions from a reference image to paper or canvas. Choose a canvas preset or enter a custom physical size. Configure the grid by row and column count or by cell size, add diagonal overlays, and choose the line color, width, and opacity. Image Editing mode keeps image gestures separate from canvas navigation. Move, pinch, rotate, crop, center, fit, fill, reset, or adjust the reference opacity. Canvas Navigation mode is available whenever you want to pan or zoom the workspace. Your complete last-used workspace is saved on-device. Export produces a deliberate 2048-pixel PNG containing the reference and grid without menus, selection borders, indices, or other editor controls. Drawing Grid 3.4 requires iOS or iPadOS 17.0 and supports iPhone, iPad, rotation, Split View, resizable windows, VoiceOver, Dynamic Type, dark mode, Increase Contrast, Reduce Transparency, and Reduce Motion.
Written user reviews are not shown here. Check current App Store reviews >
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
Zustand
React Navigation
React Native Reanimated
SVG for Graphics
BUILD KIT DIFFICULTY
Intermediate
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.
