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
Chroma Key | Green Screen
CHROMA KEY is the essential tool if you need a green screen with tracking mark in your iPhone, iPad, Mac or AppleTV
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
19 ratings · Top 30%
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
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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 Chroma Key | Green Screen: map the core Photo & Video 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
Provide a larger library of backgrounds and effects.
Assumption to check: Limited background options for editing
Validate with people who use this workflow before building.
Hypothesis 2
Focus on stability and performance optimization.
Assumption to check: Occasional crashes during image processing
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchase process and offer clear value propositions.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Streamline UI for a more focused editing experience.
Assumption to check: User interface can be cluttered
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
CHROMA KEY is the essential tool if you need a green screen with tracking mark in your iPhone, iPad, Mac or AppleTV How many times have you heard: “This will be solved in postproduction”? Being surrounded by the suitable tools let your results become flawless. Chroma Key can help you with: - Day or Night / Green or Blue: Whether if you need a bright wallpaper or one in complete darkness. Green and blue chromas to help you in both situations just in one finger tap. - Tracking marks: to facilitate the work of your VFX guys, the app has differents tracking mark to select. It doesn’t matter in which situation your filming, choose the default tracking marks or the high contrast ones, designed specifically for tough situations. - Hold down: Whether if you have to interact with the iPhone or if in your chroma everything is visual, the app adapts to you. Choose the best option for every moment. You are the one deciding how and when you leave the chroma view. - Intuitive y minimalist: We have polished every detail so that you don’t find any problem. Everything is where it is supposed to be. You don't need to adapt to the app, the app will adapt to you. «Today, with computer-generated visual effects, everything is possible. So we've seen everything. If it can be imagined, it can be put on screen.» Gabriel Campisi
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 Navigation
expo-image-picker
expo-status-bar
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.
