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
Beat Blocks - Rhythm Practice
Master Rhythm with Beat Blocks!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
8 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 included17 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 Beat Blocks - Rhythm Practice: 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
Expand song library with user-generated content or premium songs.
Assumption to check: Limited song library may not satisfy users.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce social sharing options for users to showcase their progress.
Assumption to check: No social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify in-app purchase options with clear descriptions.
Assumption to check: In-app purchase structure may confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Implement detailed analytics to help users understand their timing improvements.
Assumption to check: Lack of advanced feedback on practice sessions.
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 Rhythm with Beat Blocks! Transform the way you practice with Beat Blocks, the interactive rhythm trainer designed for musicians of all levels. Whether you’re a beginner picking up your first instrument or a pro sharpening your timing, Beat Blocks turns drills into a fun, gamified experience. Key Features: - Infinite Creation: No limits, no boundaries. Create endless rhythm drills tailored to your specific goals. - Custom Beat Editor: Build any pattern in seconds. Our intuitive editor lets you adjust tempo and notes easily. - Real-Time Feedback: Play the notes directly in the app and receive instant accuracy judgments. See exactly how close you are to the perfect beat! - Immersive Musical Notation: Bridge the gap between playing and reading. Toggle Notation Mode to see drills in standard sheet music format to master sight-reading naturally. - Advanced Mode: Push your limits with complex subdivisions, syncopation, and sustained notes (halves, wholes, and dotted quarters). - Fully Customizable: Make the practice space yours. Customize colors, themes, and sound kits to stay engaged and focused. Rhythm is the foundation of all music. Beat Blocks provides a visual, tactile system that makes timing feel like second nature. Download Beat Blocks today and level up your musicality!
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
React Native
Expo
React Navigation
react-native-slider
expo-av
react-native-reanimated
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.
