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.
music buddy – learn and memorize notes, key signatures (circle of fifths), and intervals, practice sight reading sheet music using flash cards principle.
$2.99 · 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 Music Buddy Lite – Learn notes: 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 interactive content may not engage users long-term.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: The app might lack personalized learning paths.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases may be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social features may limit user engagement.
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.
music buddy – learn and memorize notes, key signatures (circle of fifths), and intervals, practice sight reading sheet music using flash cards principle. read sheet music quickly and effortlessly like a pro. learn to recognize notes, key signatures, and intervals in the blink of an eye. three independent learning modules in one app. set aside five minutes a day for this app and you'll be reading sheet music like a professional musician in no time. the app uses an ingenious approach to memorizing information through repetition and visual patterns with a focus on hard-to-remember pieces of information. the simple, elegant, and intuitive interface allows you to switch between different note-naming systems used in major countries around the world: • c d e f g a b (major + minor, 大调 + 小调, 大調 + 小調) • c d e f g a h (dur + moll) • do re mi fa sol la si (mayor + menor, maior + menor, majeur + mineur, maggiore + minore) • дo рe ми фа coль ля си (мажор + минор) • ハ ニ ホ ヘ ト イ ロ (長調 + 短調) • 도 레 미 파 솔 라 시 (장조 + 단조) the learning experience starts by tapping the big frame with a graphical representation of selected options on the main screen of each module. a neat interface will efficiently teach you your coveted knowledge – after each session you will see a significant improvement. and you can follow your achievements on the results screen, where everything is summarized in a beautiful chart. every module has its own options that are accessible by tapping the options button in the top right corner of the main screen of the module. on the following screen you can then choose options to your liking. notes module: this module will teach you to quickly recognize notes without thinking about it – you’ll look at them and you’ll simply know them. key signatures module: this module will help you memorize the circle of fifths – a must for every musician. you will learn to recognize keys based on the number of sharps or flats in a key signature at the beginning of a staff. intervals module: this module is especially helpful for pianists. skilled pianists don't need to identify every note in a sheet. they recognize patterns based on the distance between notes (intervals) and automatically stretch their fingers accordingly. each module keeps its own history of your results, accessible using a dedicated history button, and also contains a music theory section accessible via the button with the same name. all exercises are accompanied by beautifully recorded sounds of a real acoustic grand piano. the sounds can be muted or unmuted for each module independently using a button below the staff on the exercise screen or in the options of the particular module. the volume can be set globally for the whole app in settings, or you can use the device hardware buttons. good luck on your journey toward becoming a great musician!
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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.