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
iVocal-Melodic Bliss
iVocal， your personal music world
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,751 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.
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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 included17 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 iVocal-Melodic Bliss: 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
Provide a wider range of exercises and allow users to customize their training.
Assumption to check: Limited exercise variety and customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate gamification elements to maintain user interest.
Assumption to check: User engagement drops after initial use.
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing options to encourage community and competition.
Assumption to check: Lack of social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 4
Implement detailed analytics and feedback on user progress.
Assumption to check: Difficulties in tracking long-term progress over time.
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
iVocal， your personal music world. You can listen to your beloved playlist Unlimited: No Wifi or Internet SAVE the most data and ENJOY the most trending/hot songs. Audio Player for All Type of Audio Formats Not only an MP3 player, Music Player supports all music and audio formats including MP3, MIDI, WAV, FLAC, AAC, APE, etc. And play them in high quality. - While using other apps, you can play music in the background for free with all audio files - Create a favorite playlist. - One tap to play offline music. - Save music for offline playing. - As powerful as your wish When you open the app, the first thing that catches your eye is the carefully uploaded song list, each song displayed on the homepage with a beautiful cover, name, and artist name. This is not just a showcase, but also a reflection of your musical taste. Clicking on any song will take you to a unique page designed specifically for playback, providing an immersive experience that makes you feel as if you are in a music scene. Furthermore, by clicking on the "More" option, you will discover a hidden treasure - the Rename function. Through this feature, you can freely modify the name of the current song, whether for personalization or to better organize your music library. In addition, the player is equipped with a default equalizer that is turned off. Once activated, you can enter the sound effect adjustment interface for the current song. By sliding different frequency sliders, you can adjust bass, treble, and more according to your preferences, customizing your music experience. This is not just a player, it is a tool to make your music more vivid. iVocal is the fastest way to discover popular and latest music. Now download it and enjoy it!
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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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Expo
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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.
