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
Real Tanpura
RealTanpura is a simple and easy to use app that brings you high fidelity full-stereo recordings of a real acoustic Tanpura (a drone instrument used in Indian Classical music) recorded in a professional studio environment
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
64 ratings · Top 30%
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 included17 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 Real Tanpura: 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
Offer more diverse sounds and customizations.
Assumption to check: Limited sound options compared to real instruments
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to download and save sounds for offline use.
Assumption to check: No offline mode for playback
Validate with people who use this workflow before building.
Hypothesis 3
Implement a feature to save and manage user presets.
Assumption to check: Lack of user presets
Validate with people who use this workflow before building.
Hypothesis 4
Enable sharing presets or recordings on social media.
Assumption to check: No social sharing options
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
RealTanpura is a simple and easy to use app that brings you high fidelity full-stereo recordings of a real acoustic Tanpura (a drone instrument used in Indian Classical music) recorded in a professional studio environment. Once you get used to the full and rich natural overtones produced by a real acoustic Tanpura, you will no longer prefer to use your electronic tanpura or app that produces sounds of the tanpura using synthetic or mathematical algorithms. RealTanpura has been designed as an intuitive app that children, adults, and professionals alike will find easy to use. Key features: * Professionally recorded tanpuras in studio environment * High fidelity recordings in stereo * Tanpura tuned individually per shruthi / pitch * 100% natural recordings (no mathematical manipulation to change pitch) * Rich resonance of a real tanpura * Ma, Pa, Ni modes * Five and six beat pluck patterns * [New in v2.0] Completely redesigned as a 64 bit application * [New in v2.0] Background play - use other apps while using Real Tanpura * [New in v2.5] Support for portrait and landscape orientations * [New in v2.5] In-app volume control * Simple, clean, elegant easy-to-use interface * For music students, teachers, and performers * Use also for bhajan, kirtan, meditation, and yoga * Use on stage with Bluetooth speaker
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
Zustand
expo-av
react-navigation
react-native-slider
BUILD KIT DIFFICULTY
Starter
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.
