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
PC Color Mixer
For artists using polymer clay, PC Color Mixer is an exciting, unique way to get the perfect clay colors for your project
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
9 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Add to a Remix
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/
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 PC Color Mixer: 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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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 mixing features like gradients or palettes.
Assumption to check: Limited color mixing options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add sharing functionality for social media.
Assumption to check: No ability to share colors directly to social platforms
Validate with people who use this workflow before building.
Hypothesis 3
Implement a tutorial or onboarding process.
Assumption to check: Inadequate help or tutorial for new users
Validate with people who use this workflow before building.
Hypothesis 4
Offer tiered subscriptions for advanced features.
Assumption to check: Single payment limits features
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
For artists using polymer clay, PC Color Mixer is an exciting, unique way to get the perfect clay colors for your project. Most colors can be mixed using Sculpey Premo's® or Fimo Professional® primary colors Sculpey Premo® colors: cobalt, fuchsia, and zinc, along with black and white Fimo Professional® colors: true blue, true magenta, tru yellow, black and white The color to be mixed can be selected 5 different ways - by entering a 6 digit hex code, using the handy Color Picker from a color spectrum, choosing the color from an image on your device, or by entering the color's RGB or CMYK code in the app. The user designates the amount of clay desired (in ounces), the brand of clay (Sculpey or Fimo), and the app goes to work, does the math, and calculates the exact weight in grams of the 5 primary clay colors needed to mix the chosen color. A scale is needed that can weigh grams to two decimal places. For suggestions on where to buy a scale or the necessary Sculpey Premo® or Fimo Pro® clay colors, or ideas on where to find good color palettes and hex codes to use, visit www.pccolormixer.com/help For more information: www.pccolormixer.com
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-native-gesture-handler
expo-linear-gradient
TypeScript
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.
