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
Gel Swatch Library
The Gel Swatch Library by Crossroads Motorsport, LLC., lets lighting production personnel browse, search, and compare more than 1,600 gel color filters made by the most popular manufacturers:
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
13 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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What's included18 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 Gel Swatch Library: map the core Reference 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 advanced search filters (e.g., by brand, popularity).
Assumption to check: Limited swatch search functionality
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to submit and share their own swatches.
Assumption to check: No user-generated content
Validate with people who use this workflow before building.
Hypothesis 3
Offer a freemium model with essential features for free.
Assumption to check: High price point compared to competitors
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing to enhance user engagement.
Assumption to check: No social sharing options
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
The Gel Swatch Library by Crossroads Motorsport, LLC., lets lighting production personnel browse, search, and compare more than 1,600 gel color filters made by the most popular manufacturers: - Apollo - GAM - Lee - Rosco The Gel Swatch Library lets you: - Search for gels by name or number - Sort gels by number or how they're arranged in the physical swatchbook (forwards or backwards in the swatch book) - Compare similar and complementary colors - Examine each color's detailed Spectral Energy Distribution graphs by turning the iPhone or iPod touch sideways - View CMY/RGB percentages or DMX values for any color - See the last 21 colors visited with the "Recently Viewed Colors" list - Send comments directly to the developers with the "Feedback" button We have added two great new features we think you will love: 1. Live view of colors in the gel item or gel comparison view with either front or back cameras. 2. Or see the same gel views over any photo in your library. Both of these features are available as an in app purchase. Both of the features can be previewed for free with our pre-chosen colors (G-101 & G-305). The Gel Swatch Library is perfect for: - Theatres - Churches - Cruise ships - Corporate events - Educational theater programs - Nightclubs - Theatrical dealers - And many more areas of the lighting world!
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
Axios
react-query
@react-navigation/native
Shadcn/UI
BUILD KIT DIFFICULTY
Intermediate
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.
