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
Gravitarium Live - Music Visualizer +
Join us on a divine journey with the real Music Visualizer or in the words of a fan: "A Mature Masterpiece of Living Art”
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.1
102 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 Gravitarium Live - Music Visualizer +: map the core Music 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
Support more audio formats for broader usability.
Assumption to check: Limited audio format support
Validate with people who use this workflow before building.
Hypothesis 2
Optimize visual rendering for better performance.
Assumption to check: Performance issues on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to personalize visual settings.
Assumption to check: Lack of customization options for visuals
Validate with people who use this workflow before building.
Hypothesis 4
Introduce user interactions like touch effects on visuals.
Assumption to check: Limited interactivity
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
Join us on a divine journey with the real Music Visualizer or in the words of a fan: "A Mature Masterpiece of Living Art” * The only particle based visualizer with beat detection technology! * Over 9.5k App Store reviews world-wide & about 1k Facebook fans * Now with MIC ON "dancing flow" option for your favorite streaming media * Quick help with guides and user feedback via built-in UserVoice * Stun your friends with amazing abstract line art drawings! Take an unforgettable trip into a world of thousands of particles with the ultimate multitouch particle visualizer and its unique music visualization capabilities! Gravitarium has evolved into an amazing tool you can use to visualize your own iTunes tracks or draw amazing abstract line art that makes a personal, elegant wallpaper for your device. In the traditional sense you can always just guide the particle flow with your fingertips to achieve 10 different animations depending on the number of touches on the screen: 1 - Rocket, 2 - Sparkle, 3 - Energy flow, 4 - Atomic, 5 - 3D freeze, 6 - Circularium, 7 - Fish, 8 - Vortex, 9 - Lasers, 10 - Lightning. Gravitarium Plus Features: ► Sticky flow option allows for the animation to stay active without any fingers on the screen ► Dancing flow animates the particles at 60fps while sensing and responding to background music ► Lines / Specks Drawing modes provide for unique abstract art creations ► Ability to Save, Edit and Share your creations or use the built in “Wallpaperizor" to make a parallax optimized image ► Includes 10 original tracks by Silent Strike + allows for selection from your iTunes library ► Provides the ability to use the built-in microphone and have the particles react to other sound activity (such as Pandora or own voice) ► Incorporates a multiplayer dexterity training game and a multiplayer drawing / flow mode to play with a friend via Game Center ► Animation options with the ability to save and load presets ► Cross-device play capable: iPad to iPad, iPhone to iPhone, iPhone to iPad…etc. Included Apple Watch App adds the ability to control options and playlists from your wrist like a remote. Tip: Got a Projector? Try it with AirPlay mirroring for the ultimate party fun ;-) Unleash your creativity and make your own unique masterpiece today!
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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
expo-av
react-native-animated
react-native-file-picker
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.
