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.
choose an exercise: see the notes and hear them played
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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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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 Jazz ScaleHelper: 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 scale 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 interactive tutorials.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline functionality.
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.
choose an exercise: see the notes and hear them played play the exercise: get a score, see the notes you played and listen to your performance jazz scalehelper is the fast way to improve your playing. with actual feedback based on what you played, jazz scalehelper enables you to concentrate on the aspects of your playing that will help the most. jazz scalehelper has 3 modes: 1. play any scale: jazz scalehelper determines the exercise you have played and scores your performance. ideal for impromptu practise sessions. 2. choose a scale: choose the exercise you want to play and jazz scalehelper listens and gives you a score. ideal to improve a specific musical exercise. 3. challenge me: jazz scalehelper will ask you to play exercises from your challenge list that is based on your chosen syllabus. jazz scalehelper will identify what you need to practise and make sure you get exam ready while having fun on the way. ideal for practising a range of exercises. jazz scalehelper contains everything you need for the instruments covered by the jazz syllabuses from trinity guildhall and abrsm examining boards. jazz scalehelper will be there for you every step of the way as you grow as a musician. jazz scalehelper allows you to create your own syllabus from the exercises it supports: major scales; dorian modes; lydian modes; lydian flat 7 modes; mixolydian modes; melodic minor scales; jazz melodic minor scales; harmonic minor scales; pentatonic major scales; pentatonic minor scales; blues scales; diminished scales; chromatic scales; whole-tone scales; phrygian modes; locrian modes; altered modes; aeolian modes; major arpeggios; minor arpeggios; augmented arpeggios; major sevenths; minor sevenths; diminished sevenths; half-diminished sevenths; major/minor sevenths; and minor/major sevenths. all exercises are available starting from every tonic over 1 octave, 1 twelfth, 2 octaves, 2.5 octaves and 3 octaves. there is a range of exercise lists for popular music exams available for download. (jazz scalehelper lite only supports major scales, blues scales and major arpeggios over 1 octave) instruments supported include violin, viola, cello, guitar, bass guitar, clarinet, flute, oboe, saxophone, bassoon, recorder, trumpet, cornet, trombone and horn. a full list is available at www.jazz.scalehelper.com along with details of the rich feature set jazz scalehelper has to offer. at less than the price of a single music lesson the guidance that jazz scalehelper provides between your lessons builds on that teaching. you can dispense with the need to review scales by playing them in your lessons and instead reuse the time you gain to learn technique and perfect your pieces. jazz scalehelper supports multiple users, keeping each user's history for each of their instruments. you can save recordings to study later or to show and play to your teacher and friends. you can also email recordings to share them with others. have fun competing with your friends to see who can get the highest score or who can maintain the highest average.
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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.