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
Bit Piano - Play & Record
Designed for musicians, hobbyists, and everyone in between, BitPiano offers a unique way to engage with music anytime, anywhere.
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 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 Bit Piano - Play & Record: 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
Introduce more instrument sounds and customization options.
Assumption to check: Limited instrument options, primarily just piano sounds.
Validate with people who use this workflow before building.
Hypothesis 2
Add functionality to share recordings on social media.
Assumption to check: No social sharing features for recorded tracks.
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline access to recorded tracks.
Assumption to check: No offline playback for recorded tracks.
Validate with people who use this workflow before building.
Hypothesis 4
Implement audio editing features for recorded tracks.
Assumption to check: Basic recording functionality with no advanced editing tools.
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
Designed for musicians, hobbyists, and everyone in between, BitPiano offers a unique way to engage with music anytime, anywhere. Key Features: - Portable Piano: Turn your Apple Watch into a compact and intuitive piano. Play chords and melodies with ease, using just your fingertips. - On-the-Go Music Creation: Whether you're waiting for a bus or taking a break, your next musical inspiration is just a tap away. - Instant Recording: Got a melody in your head? Record it instantly on BitPiano and never lose a stroke of genius. - Playback and Enjoy: Relisten to your creations, refine them, or simply enjoy the melodies you've crafted. - Intuitive Interface: Designed with simplicity and ease of use in mind. - For Everyone: Whether you're a professional musician needing to capture a quick idea or someone who enjoys tinkering with tunes, BitPiano is for you.
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
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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.
