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
VJ-XY — live visual instrument
VJ-XY is a live visual instrument for your midi controller.
$24.99 · In-app purchases
PRICE
$24.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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
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A product spec, screen plans, and build steps for your coding agent.
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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 included19 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 VJ-XY — live visual instrument: 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
Incorporate user feedback mechanisms to improve features.
Assumption to check: Lack of user reviews and feedback.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a free trial or freemium model to increase user acquisition.
Assumption to check: High price point may deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a tutorial system to guide new users.
Assumption to check: Limited tutorials or onboarding guides.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize rendering performance for smoother interactions.
Assumption to check: Potential performance issues with complex visuals.
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
VJ-XY is a live visual instrument for your midi controller. prepare. connect. perform. build your sets on iPad, iPhone or Mac*. connect your midi controller over bluetooth or USB-C midi. play notes to launch clips and sweep vfx live as your track moves. send clean visuals to an external display while the iPad stays in your hands. *sets are not shared across devices. — prepare — create scenes and order them into a set. import your own videos, photos, and animated gifs, or use the built-in matrix clips. layer stills and gifs into canvas clips — a single 16:9 visual built from arranged, scaled, rotated layers. no footage required to start. — connect — pair your midi controller over bluetooth or USB-C midi. set each scene to a midi channel. notes from F3 upward trigger clips. cc1 to cc4 control four vfx slots, live. — perform — launch clips by playing notes. trigger canvas layers live. sweep vfx by moving cc. let your controller's patterns and scenes drive clip changes as the song progresses. mix between clips with transitions. blend layers and clips against a chosen background color. VJ-XY is your control surface; the external display is the room. what's inside · import videos, photos, and animated gifs · layered canvas clips · built-in matrix clips · vfx · custom vfx presets · blend modes and background color · loop modes · launch clips with notes · mix clips with transitions · sequence clips and vfx live · bluetooth and USB-C midi · external display output VJ-XY produces visuals only. it stays muted, so your audio setup is untouched. one-time price, no subscription. you buy it, you own it. made by thx. [email protected]
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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.
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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.
