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
Color Picker – HEX, RGB, & HSL
Color Picker is the simplest way to create and explore color palettes.
$0.99 · In-app purchases
PRICE
$0.99
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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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 Color Picker – HEX, RGB, & HSL: 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
Add more color formats and conversion features.
Assumption to check: Limited color formats compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement color preview before saving.
Assumption to check: Lack of user feedback mechanisms.
Validate with people who use this workflow before building.
Hypothesis 3
Enable sharing of colors via social media.
Assumption to check: No sharing options for saved colors.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial or more free features to attract users.
Assumption to check: In-app purchase for basic features may deter users.
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
Color Picker is the simplest way to create and explore color palettes. Tap to create a color, view its HEX, RGB, HSL, and contrast readability values, and adjust each one precisely. Displays complementary, split, triadic, and monochromatic harmonies to expand your palette with perfect matches. Built for designers, artists, developers, and anyone who works with color. Features - View and edit Hexadecimal color values, #000000 - #ffffff - View and edit RGB color values,0 - 255 - View and edit HSL color values- View contrast visibility values 1.0-21.0 and human readable (good/better/best) - See complementary, triadic, and monochromatic colors - Copy color codes instantly - Easily share color swatches and values - Simple, minimal interface - No ads, no accounts, no data, completely offline Color Picker makes it easy to find the right shade, build balanced palettes, and keep your creative flow fast and distraction-free.
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
React Navigation
React Native Async Storage
Expo Slider
React Native Clipboard
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.
