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.
From the creator of Flashnote Derby comes a fun and educational app that helps kids learn about rhythm and how it is written with music notation.
$3.99 · 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.
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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 Rhythm Swing- Music Drills: map the core Education 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 variety of drills available
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficult navigation for new 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.
From the creator of Flashnote Derby comes a fun and educational app that helps kids learn about rhythm and how it is written with music notation. Students will love outwitting the nasty crocodile by tapping rhythms correctly. A variety of levels take students from simply keeping a steady beat up through all different types of notes and rests. The humorous gameplay will keep them motivated to master each new concept. Each level of Rhythm Swing has a brief instructional video which explains the new rhythm concept. Students can view and listen to short musical phrases and hear exactly how they sound. In practice mode, you can attempt hundreds of rhythms until they are mastered. Helpful feedback will guide you in fixing any mistakes. When the student is ready, they can progress to the game, which requires precise accuracy. Types of Rhythms Covered: Quarter Notes and Quarter Rests Half Notes and Half Rests Whole Notes and Whole Rests Dotted Half Notes Eighth Notes and Eighth Rests 4/4, 3/4, and 2/4 Time Signatures More levels featuring more complex rhythms are coming soon! Here's what some of our early reviewers are saying... "My students and I LOVED Rhythm Swing. It was a real eye opener as to which of my students could instinctively keep a steady beat." - K. W., piano teacher "This is a great app. I am using it with beginners. It helps to maintain the steady beat ...at different tempos. What makes it different from other rhythm apps is that it requires holding half notes for two full counts, it progresses slowly enough to use with beginners and it uses different tempi in each level. Thank you!" - J. Z., piano teacher "After playing with Rhythm Swing for awhile my students and I have grown to enjoy it. Most of them like the practice section better than the game because they feel less pressure but eventually they all get around to playing the game. I have all positive things to say about it so far... Keep up the great work!" - S. C., piano teacher
Written user reviews are not shown here. Check current App Store reviews >
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.