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.
Immediate access to fingerings (with alternates) for each instrument’s entire playable range
$1.99 · 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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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 Fingering Brass for iPhone: 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 number of instruments available
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of interactive features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline access to charts
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent user interface
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.
Immediate access to fingerings (with alternates) for each instrument’s entire playable range. Get fingerings from the written or concert pitch. Instruments: F/Bb Double French Horn, A, Bb, C and D Trumpets (Cornet, Flugelhorn), Bb/F Tenorbass and Bb/F/Gb/D Bass Trombones, Euphonium and Baritone, BBb, CC, Eb and F Tubas The 'Piano' instrument simultaneously displays the note names, the locations on the piano, and the musical notations of up to 5 pitches in either Treble, Alto, Tenor or Bass clef. The Notation can be transposed for most all instrumental transpositions. • Trombones include position guides for the different valve combinations. Common Clefs for Select Instruments: • Bb/F Tenorbass Trombone, Bb/F/Gb/D Bass Trombone, Euphonium and Baritone include Treble, Tenor and Bass clefs. • F/Bb Double French Horn, BBb Tuba, CC Tuba, Eb Tuba, and F Tuba include Treble and Bass clefs. Treble clef on the brass instruments follow British Band tradition of being in transposing notation for non-transposing instruments. Affects Bb/F Tenorbass and Bb/F/Gb/D Bass Trombones, Euphonium, Baritone, and BBb, Eb and F Tubas. How to Use: Pick a written note (touch the staff) and have the fingering displayed and concert pitch played. Touch a button and reveal the note on the piano. Play a concert pitch on the piano, and have that pitch's fingering displayed. Touch a button and reveal the transposed note written on the staff. • If there are alternate fingerings available for a note, a button will allow you to navigate through them. • Use the 'Play Note' button to repeatedly hear what's being displayed. • Use the mute button to access the fingerings without hearing the pitches. Selecting a Pitch: Using the Staff (transposed for the current instrument): Simply touch and slide up and down on the staff to select the note, slide to the right or left of the note for sharps and flats. Using the Piano (concert pitch): drag in the area below the keyboard to move the keyboard, touch to play notes, touch & slide to change the pitch. When you glissando up the keyboard, notes will be notated as a raised value (sharps), when you glissando down, notes will be notated as lowered values (flats). Use the up and down arrows to move chromatically up and down without touching the music staff or piano keyboard.
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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.