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
Colors!
Colors! provides a fun and simple painting experience and invites the user to browse and participate in an online gallery consisting of countless beautiful paintings.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
25 ratings · Below Average
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Colors!: map the core Entertainment 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
Introduce more advanced mixing options and presets.
Assumption to check: Limited color mixing features
Validate with people who use this workflow before building.
Hypothesis 2
Add options for users to share their favorite colors on social media.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the UI with animations and color transitions.
Assumption to check: User interface is not very engaging
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance for faster loading and smoother interactions.
Assumption to check: Performance issues with large color datasets
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
Colors! provides a fun and simple painting experience and invites the user to browse and participate in an online gallery consisting of countless beautiful paintings. SIMPLE BUT POWERFUL Designed to have a quick and non-intrusive workflow, Colors! provides the tools you need, without any of the distractions. INTEGRATED GALLERY Half of the fun of painting is to show others the result. In Colors! you can easily upload your works to the vibrant Colors! community, or just share it on Facebook/Twitter. Get feedback, make friends and participate in our regular painting challenges. PLAYBACK ANY PAINTING Colors! always records the full painting process. View your own playback, and branch it off at any point to take it in a different direction. Or view the playback of any painting in the gallery to learn from other artists. HIGH RESOLUTION Taking full advantage of the Retina screens, you can paint in 2048x1536 resolution and export your finished painting in even higher!
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
Expo Linear Gradient
BUILD KIT DIFFICULTY
Expert
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.
