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
VocalTune
VocalTune makes your vocals sound amazing in seconds
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 VocalTune: map the core Entertainment 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
Integrate with music APIs to expand song selection
Assumption to check: Limited song library for practice
Validate with people who use this workflow before building.
Hypothesis 2
Add features to share practice results on social media
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement analytics to track user improvement over time
Assumption to check: Lack of detailed progress tracking
Validate with people who use this workflow before building.
Hypothesis 4
Allow multiple user profiles for families or groups
Assumption to check: Single profile limit
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
VocalTune makes your vocals sound amazing in seconds. Whether you're a content creator, singer, or just having fun, get professional-grade pitch correction right on your iPhone. SIMPLE & POWERFUL • Select any video from your library or record a new one • Auto-detects the musical key and scale • One tap to apply pitch correction • Real-time preview - hear changes instantly PROFESSIONAL CONTROLS • Adjustable tuning speed (subtle to instant) • Tuning strength control for natural or heavy effects • Preserve natural vocal character with formant correction • Humanize feature prevents robotic sound STUDIO-QUALITY EFFECTS • Professional reverb with multiple room types • Vocal compression for polished, radio-ready sound • Real-time effect adjustments • Preview before you save PERFECT FOR • TikTok and Instagram creators • Singers wanting quick vocal touch-ups • Musicians creating content • Anyone who wants better-sounding videos EASY WORKFLOW 1. Select or record a video 2. Let the app detect your key (or choose manually) 3. Adjust tuning strength and effects 4. Preview, save, and share Save your tuned videos directly to Photos or share to any app. Your original videos are never modified. Tips for best results: Use videos with clear, isolated vocals. Use headphones while recording for the cleanest sound.
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
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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.
