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
Pistoneer - Brass Instrument
A new kind of music app that lets you play using trumpet-style piston valve fingerings.
$1.99 · In-app purchases
PRICE
$1.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Pistoneer - Brass 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
Enhance interactivity through gamification and progress tracking.
Assumption to check: Limited interactive features compared to other music learning apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement a robust progress tracking system with visual feedback.
Assumption to check: Difficulty in tracking progress over time
Validate with people who use this workflow before building.
Hypothesis 3
Add social features like discussion boards or user forums.
Assumption to check: Lack of community features for peer learning
Validate with people who use this workflow before building.
Hypothesis 4
Expand lesson library to cover more genres and techniques.
Assumption to check: Insufficient variety of lessons for different skill levels
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
A new kind of music app that lets you play using trumpet-style piston valve fingerings. It supports realistic performance techniques and even allows expression through MIDI breath input. You can shake your iPhone to add vibrato to the sound. With MIDI output compatibility, you can connect to external sound modules, and choose from 16 built-in instrument sounds. Also ideal for brass instrument training / practice. * The maximum number of touches on iPhone is 5. Over 5 touches is not allowed. Sound List: - Trumpet - Horn - Tuba - Muted Trumpet - Alto Saxophone - Clarinet - Flute - Harmonica - Organ1 - Organ2 - Violin - Cello - Strings - Brass Section - Square Wave - Saw Wave Settings: [Control] - Key Shift - Octave Shift - Expand Partial Area - Synth Sound (16 Sounds) - 4th Valve - Static Partial Area - Suppress the 5th Partial - Displays Actual Notes - Finger Width - Finger Guide [Touch / Breath] - Touch to Breath - Require Touch in a Partial Area - Velocity - Receive Control - Breath Threshold - Send Control 1 - Send Control 2 - Send Control 3 - Send Control 4 [Leaning Motion] - Motion Enable - Breath Modulation - Minimum Send Value - Maximum Send Value - Sensitivity - Threshold - Send Control 1 - Send Control 2 - Send Control 3 - Send Control 4 [Shaking Motion] - Pitch Modulation - Sensitivity - Threshold - Direction - Receive Pitch-bend [MIDI Devices] - MIDI Source - MIDI Destination - Bluetooth MIDI [MIDI] - Receive Channel - Send Channel - MIDI Thru [Synthesizer] - Mute - Reverb Level - Buffer Size [Others] - Reset Settings Note that: The application and description contain AI-generated contents.
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
Supabase
Zustand
React Navigation
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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.
