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 Harmony by Powsty
Do you need to find the perfect combination of colors for your project? Maybe you have a photograph that you really like and want to convert to the palette of colors? Maybe you have your dream color chosen and want to...
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
12 ratings · Top 15%
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 Color Harmony by Powsty: 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
Introduce advanced editing features like gradients and textures.
Assumption to check: Limited functionality in color manipulation tools.
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud storage for user palettes.
Assumption to check: Palettes can only be saved locally without cloud sync.
Validate with people who use this workflow before building.
Hypothesis 3
Add social features to share and rate palettes.
Assumption to check: No community features for sharing palettes with other users.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a guided onboarding process to educate new users.
Assumption to check: User onboarding is minimal, leading to confusion.
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
Do you need to find the perfect combination of colors for your project? Maybe you have a photograph that you really like and want to convert to the palette of colors? Maybe you have your dream color chosen and want to know which colors are harmonic? Download this app and explore its capabilities! FEATURES: • 3 different ways to create palettes (harmonic, from image, and custom) • Variety of color modes (RGB, HSV, RAL, CMYK) • Variety of algorithms of color harmony • Matching colors in camera mode • Organizing palettes into favorites and collections • Translating colors to RAL format (the color matching system used in Europe) • Stunning design with a clean look and feel LANGUAGES: • English • Spanish • Polish • German • Italian • Portuguese • Turkish
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
Axios
Async Storage
React Native Color Picker
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.
