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.
Symphony is the premiere notation app and notepad for professional musicians, composers, and students alike, allowing to you create anything from piano sheet music to large orchestrations directly on your iPhone.
$4.99 · 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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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 Symphony – Music Notation: 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 export options for scores
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficult to use for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Occasional bugs in note placement
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No collaboration features
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.
Symphony is the premiere notation app and notepad for professional musicians, composers, and students alike, allowing to you create anything from piano sheet music to large orchestrations directly on your iPhone. The Pencil tool allows you to tap anywhere on the canvas to quickly add notes and chords with the multi-staff & multi-voice editor. Powerful editing features like vertical drag to transpose and On-Screen piano lets you compose even more quickly. Switch to the other Select tool to highlight one or more notes to modify duration, transpose, erase, cut, or paste multiple tracks & bars anywhere you want. To hear your performance, choose from 100+ acoustic instruments available for live, low-latency, multi-track playback. Import an existing Symphony/SP project or a MIDI/XML file to bring your music collection to life, with an interactive score display & interface optimized for the small screen. To send your work to a different editor or to a sheet music viewer, Symphony can print your score with AirPrint, share it as a PDF attachment, or as a MIDI, MusicXML, or audio file to DropBox and iCloud Drive. More Features: • Write notes using direct touch, an on-screen instrument, a MIDI input device, or even a QWERTY keyboard • Notate beautifully formatted chord charts & lead sheets using the Chord Symbol and Lyric tools. • Import MusicXML, MIDI, MXL, or Symphony files • Export as a PDF, MusicXML, MIDI, AAC, or Symphony file • Print the score from your iPad with AirPrint • Edit grace notes and percussion/drum set notation • Intuitive score and document navigation • Up to 15 instruments, 45 staves, 4 voices/layers per score • Record MIDI to notation in real-time using a click track • Backup & sync scores with iCloud • Edit tablature and standard music notation • Large selection of articulations & dynamics in the Expressions menu • Copy/Paste function can select multiple measures & staves, and cut single or multiple voices/layers • Unlimited undo and redo • Customizable stem directions & note beaming • Transposing instruments & concert pitch options • Change tempo or clef at any point in the score • Stream audio or share your screen wirelessly with AirPlay • Advanced document management support • Customizable part groupings for SATB and instrument families • Customizable chord symbol, lyric, and annotation font • Loop playback between a region selection • Auto-save For more info, please visit: • Product overview: http://symphonypro.net/iphone • Ask support questions by visiting forums.symphonypro.net • Like us on Facebook at facebook.com/symphonyapp ************************************************** • Symphony iPhone is now a paid app before download: – Free Edition users who have never upgraded can now enable Symphony: Full Edition by rating or reviewing the app
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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.