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
PocketCanvas Drawing Studio
BUILT FOR PRIVACY · Everything stays on your device
$2.99
PRICE
$2.99
No 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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included
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 PocketCanvas Drawing Studio: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
BUILT FOR PRIVACY · Everything stays on your device. No accounts. No cloud. No tracking. PocketCanvas is a stable, pocket-sized drawing studio built for artists who value reliability and ownership. WHY POCKETCANVAS • Crash-free engine — optimized memory handling, zero background sync overhead • Dedicated Undo/Redo buttons — always visible, plus two-finger tap undo, three-finger tap redo • Buy once, own forever — $4.99, no subscription, no IAP, no ads • 100% offline — works on airplane mode, zero data leaves your device • Pro-grade tools — layers, blend modes, pressure-sensitive brushes, custom canvas sizes CORE FEATURES • Canvas: multi-layer, blend modes (Normal/Multiply/Screen/Overlay), up to 4096×4096 px • Brushes: 12 preset brushes (pencil, ink, watercolor, marker, airbrush…), fully customizable • Gestures: two-finger undo, three-finger redo, pinch zoom/rotate, quick color picker • Export: PNG, JPEG, layered PSD, .pocketcanvas project file • Privacy: no analytics, no crash reporting, no network permission requested DESIGNED FOR IPHONE & IPAD Native rendering optimized for Apple Pencil (Pro) hover, squeeze, and barrel rotation. WHO IT'S FOR PocketCanvas is for illustrators, designers, and journaling enthusiasts who want a dependable sketching tool that respects their privacy. Whether you're commuting, capturing a flash of inspiration, or building a layered illustration, PocketCanvas gives you professional tools without the subscription tax. Privacy Policy: https://louiscai.cn/privacy | Support: https://louiscai.cn/support
Written user reviews are not shown here. Check current App Store reviews >
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
Incorporate a wider variety of brushes and shapes.
Assumption to check: Limited drawing tools compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Enable real-time collaboration on drawings.
Assumption to check: No collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Add cloud storage and sync capabilities.
Assumption to check: Lack of cloud sync
Validate with people who use this workflow before building.
Hypothesis 4
Introduce guided tutorials for new users.
Assumption to check: No tutorial or onboarding experience
Validate with people who use this workflow before building.
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
react-navigation
expo-gesture-handler
react-native-reanimated
expo-file-system
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
