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
Kids Paint: Heavy Equipment
Private offline coloring.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included14 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Kids Paint: Heavy Equipment: 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 brushes, textures, and stickers for enhanced creativity.
Assumption to check: Limited variety of painting tools and options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more intuitive save/share process with social media integration.
Assumption to check: Difficulty in saving and sharing artwork
Validate with people who use this workflow before building.
Hypothesis 3
Introduce challenges or contests to encourage kids to use the app more.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for better responsiveness on low-end devices.
Assumption to check: Slow performance on older devices
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
Private offline coloring. One purchase. No subscription. No ads. No in-app purchases. No account. Kids Paint: Heavy Equipment is a coloring app for kids with 272 big machine coloring pages. Explore excavators, bulldozers, cranes, and dump trucks from construction sites; tractors and combines from farms; mining machines, fire trucks, garbage trucks, snow plows, airport machines, port machines, and a tunnel boring machine. Each page is labeled, so kids learn what every machine is called and what it does. Kids color with a brush, draw freely, erase mistakes, undo changes, clear a page, save their work, and print finished pictures. Free Drawing offers a blank canvas for original pictures. Coloring works offline after installation. Artwork stays on your phone or tablet. Child Lock works with your device’s built-in single-app controls to help keep kids in the app. Buy it once, own it forever. Built by a mom and dad, for their kids. Just coloring.
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
Supabase
Zustand
react-navigation
react-native-reanimated
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.
