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
FindPaintColor
Trying to find a paint color to match an unknown existing wall (or other surface) color? Or maybe find lighter or darker colors of the same hue, or possibly complementary colors?
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.6
21 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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What's included16 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 FindPaintColor: map the core Utilities 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
Implement machine learning for improved accuracy.
Assumption to check: Accuracy of color detection can be inconsistent.
Validate with people who use this workflow before building.
Hypothesis 2
Expand the database with user-contributed colors.
Assumption to check: Limited color database for matching.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify onboarding and provide user tutorials.
Assumption to check: User interface can be confusing for first-time users.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for users to create and save color palettes.
Assumption to check: No advanced features for color palette creation.
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
Trying to find a paint color to match an unknown existing wall (or other surface) color? Or maybe find lighter or darker colors of the same hue, or possibly complementary colors? FindPaintColor finds the best-match paint colors from thousands available from major paint vendors, by analyzing a photo of your unknown color with a specified white color chip available free from your paint dealer. The photo is taken within the app, and must be taken in natural (window) lighting only. Although other high-accuracy solutions require an external color sensor, FindPaintColor uses the iPhone camera and advanced image processing, so no separate color measurement device is required. Accuracy is similar to external color sensing devices, and will identify the nearest few color chips for your final match, including the many that are available but not usually on display at your paint store. The app can save multiple trips back and forth to your dealer and eliminates the vexing need to bring in a sample. It finds paints from these four major paint vendors: Behr, Benjamin Moore, PPG, and Sherwin Williams. The app also finds paints darker or lighter than your color, and complementary colors, using industry-standard color wheel methods. It provides industry-standard ‘sRGB’ (standard Red Green Blue) values, to allow finding paints from other vendors. It also shows HSV (Hue Saturation Value) and LRV (Light Reflectance Value) numbers, to help you compare colors numerically as well as by eye. The required white color chip is used by the app to measure ambient light – a must for accuracy, and as long used by professional photographers to ensure color accuracy. This white chip may be any one of the following, available free from your paint dealer: Behr: PR-W15 (PPU18-06) Ultra Pure White PR-W14U Bit of Sugar Benjamin Moore: OC-65 (2120-70) Chantilly Lace OC-68 Distant Gray PPG: PPG1172-1 Snow Storm PPG1049-1 Snowy Mount Sherwin Williams: SW 7757 Highly Reflective White SW 7006 Extra White Any one of the above chips will work to find the closest colors from all four paint vendors. The app provides simple instructions for use, and trial demonstration photos to ensure a smooth start.
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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/native
expo-camera
@react-native-async-storage/async-storage
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
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.
