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
T2L Electric Piano
A Virtual electric piano that feels and responds like a real instrument, not just in tone, but in spirit.
$24.99 · In-app purchases
PRICE
$24.99
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 included16 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 T2L Electric Piano: 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 sound library with premium packs and user-generated sounds.
Assumption to check: Limited sound options compared to physical pianos or advanced apps
Validate with people who use this workflow before building.
Hypothesis 2
Integrate MIDI functionality and a robust recording feature.
Assumption to check: No advanced features like MIDI support or recording capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Create onboarding tutorials and simplify the interface.
Assumption to check: User interface may be overwhelming for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free tier with limited features to attract more users.
Assumption to check: High cost for a niche audience
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 Virtual electric piano that feels and responds like a real instrument, not just in tone, but in spirit. T2L (True to Life) technology represents a hybrid synthesis approach that combines high-resolution Sampling with real-time physical Modeling to reconstruct the full behavior of an electric piano at a granular level. Main features: - Works in landscape and portrait mode - Works as a standalone application and as an AUv3 plugin - Supports automatic resizing within DAW software - Supports Backgroud audio mode - Optimized for low memory and CPU usage - 7 Platinum Electric Piano types - 71 Electric Piano presets, 18 Audio Effects, 24 Ambience types - 23 Temperament curves, 21 Velocity curves - Excellent audio quality (SRE: Smart Residual Engine) - Available for both iPad and iPhone
Written user reviews are not shown here. Check current App Store reviews >
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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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.
