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
Merengue Rhythms - BeatLab
Master the rhythm and instruments of Merengue!
$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/
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 Merengue Rhythms - BeatLab: 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 diverse library of samples and instruments, including user-generated content.
Assumption to check: Limited variety of instruments and samples available
Validate with people who use this workflow before building.
Hypothesis 2
Implement social sharing options to allow users to share their creations easily.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to download tracks for offline playback.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Include onboarding tutorials to help users understand how to create music.
Assumption to check: No tutorials or guidance for new users
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
Master the rhythm and instruments of Merengue! Want to improve your musical ear, understand the instruments of merengue, or dance with better timing and musicality? BeatLab is the ideal tool for dancers, musicians, and instructors. KEY FEATURES • Interactive Instrument Control - Listen to and study each instrument separately: tambora, güira, piano, bass, and more. • Adjustable BPM Control - Practice at your own pace, from a slow tempo for learning to full party energy. • Multiple Rhythmic Variations - Explore different arrangements and styles within merengue (Classic, Urban, Orchestral). • Volume Mixer - Adjust the volumes of individual instruments to focus on details like the tambora's tumbao or the güira's pulse. • Beat Counting - An integrated counting voice helps you keep time and find the "1". IDEAL FOR: • Merengue Dancers - To develop better timing and musicality for a more fluid and authentic dance. • Music Students - To learn to identify and understand the role of each instrument in merengue. • Dance Instructors - To teach students the structure of merengue, tambora patterns, and rhythmic foundations. • Musicians - To practice playing along with authentic merengue arrangements. INCLUDED INSTRUMENTS: • Tambora • Güira • Piano • Bass • Saxophone • Trumpet • Accordion • Maracas IMPROVE YOUR MERENGUE SKILLS Whether you struggle to find the beat, want to refine your dance technique, or need to understand how merengue is built around the tambora's pulse, this app gives you the tools to accelerate your learning. Train your ear to distinguish each instrument and develop the musical foundation that separates good dancers from great ones. Start your merengue journey today and feel the rhythm like never before!
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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
Zustand
@react-navigation/native
expo-av
react-native-gesture-handler
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.
