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.
Harmonomics is a deep, flexible ear-training studio for musicians at every level—from first intervals to advanced harmony.
$9.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Harmonomics Ear Training: 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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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
Assumption to check: Limited exercise variety compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No feedback mechanism for users
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Harmonomics is a deep, flexible ear-training studio for musicians at every level—from first intervals to advanced harmony. Build real listening skills through more than 50 exercises covering intervals, melodies, chords, chord progressions, scales, music theory, perfect pitch, and relative pitch. Harmonomics goes beyond basic identification with exercises for chord inversions, altered dominant chords, simultaneous pitches, scale degrees, root movement, and much more. PRACTICE YOUR WAY • Customize each exercise with focused, exercise-specific settings. • Create your own exercises for the exact skills you want to develop. • Work with a large library of more than 35 chord types in multiple inversions. • Choose from multiple in-app color themes, with light and dark appearance options. • Use keyboard shortcuts on supported devices for fast, hands-on practice. SEE YOUR PROGRESS • Review accuracy, question counts, response time, and detailed results. • Explore your history for each exercise and see how your performance changes over time. • Stay motivated with daily goals, streaks, achievements, and personal records. • Revisit completed sessions in your reports archive. FROM FUNDAMENTALS TO ADVANCED HARMONY Start with essential interval, melody, and chord recognition, then move into advanced exercises that challenge you to hear inversions, chord tones, altered harmonies, multiple simultaneous pitches, and complex sequences. Every exercise can be shaped around your level, your instrument, and the music you want to master. Whether you are beginning ear training, preparing for school, sharpening your improvisation, or maintaining professional-level listening skills, Harmonomics gives you room to keep growing. From the creator of Metronomics.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.