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
Harmonium Anywhere
Harmonium Anywhere as name says is a best alternate to a real Harmonium.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
462 ratings · Top 15%
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 included13 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 Harmonium Anywhere: 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
Implement offline access for all lessons after download
Assumption to check: Limited offline access to lessons
Validate with people who use this workflow before building.
Hypothesis 2
Add forums or chat for users to discuss lessons
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 3
Allow user accounts to sync across devices
Assumption to check: No support for multiple devices
Validate with people who use this workflow before building.
Hypothesis 4
Introduce more subscription payment methods
Assumption to check: Limited payment 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
Harmonium Anywhere as name says is a best alternate to a real Harmonium. If you are travelling or has no access to real harmonium, or just need a quick practice before performance, you will find Harmonium Anywhere pretty handy. Samples are recorded from a high quality Made in India Harmonium. For quick practice sessions, this is a must have application. Harmonium Anywhere provides: - 3 octaves. - Multi touch keyboard. - Coupler feature (Right Octave). - Real harmonium high quality sound with 3 sustain levels. - Reference/Highlighter key, to allow especially kids to remember the start note. - Scale changer up to 12 notes. - Note identifier in 3 different formats: Western, Gurmukhi, Devanagari Notations. - Scroll lock feature to lock accidental scroll of keyboard. - Display Optimized for both iPhones and iPads. - Designed keeping the needs of Kids who don't have real harmoniums. - Compatible with other music apps, e.g. tabla apps on app store. - Zoom button added to provide more keys especially on iPads. - Now you can either record: - Harmonium sound only - Any sound including Harmonium with the help of in-built microphone. - Playback recordings, share on social sites or with friends, teachers, etc. - Better sound clarity. - MIDI support - More features will follow based on user feedback/reviews. - Loop feature for each harmonium key
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
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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.
