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.
LEARN — Map songs and understand complex rhythms.
$9.99 · 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 PolyNome: THE Metronome: 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 sound options compared to other metronomes
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Some users find the UI confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline access for saved patterns
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High price point compared to similar apps
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.
LEARN — Map songs and understand complex rhythms. PRACTICE — Plan, play, and track your progress. PERFORM — Build your band’s click Setlist in seconds. Designed by a musician, for musicians. Used by Vinnie Colaiuta, Peter Erskine, Virgil Donati, Dennis Chambers & more. ◆ THE BASICS ▶ Sample-accurate metronome for any time signature, with automatic and randomized tempo changes, subdivision faders, tap tempo, Big Numbers, and a classic pendulum. ▶ Choose from hundreds of sounds, including voice counting. With Premium, import or record your own samples. ▶ Use the repeat counter and timer to track your work or stop automatically at your target. ▶ Program two independent sequencers with overlapping rhythms or different time signatures. ▶ Built-in tuner with calibration (for example, A=442), plus hands-free control using Siri or Bluetooth/MIDI. NOTE: Playlists, Practice Log, Media Tracks, Konnakol, Custom Sounds, and more require an In-App Purchase. Eligible customers can try Premium free for one month. PolyNome Pro is a separate one-time purchase with all features available at purchase. ◆ LEARN › Learn songs faster and take the stress out of rehearsals with Media Tracks ▶ Import from Apple Music, YouTube, or your own audio and video files. ▶ Mark bars and sections in one pass, then jump anywhere with a tap—no scrubbing to find your place. ▶ Loop or slow down difficult passages, then create and annotate a clean, printable Lead Sheet. › Learn with interactive resources ▶ Install resources combining video, playable rhythms, scores, and notes—from the 40 Essential Rudiments to The Black Page—or create your own. › Hear, see, and understand complex rhythms ▶ Program virtually any rhythm—even irrational meters such as 4/5—and hear accents, flams, drags, rolls, and ties played precisely. ▶ Add automatic spoken and written counting, or use Stroke Guides to see the correct sticking for any rudiment. ▶ Build two- and three-way polyrhythms, hear how the parts fit together, and follow multiple animated visualizations. ◆ PRACTICE › Plan ahead. Then just play ▶ Use Goals to choose what to work on, when, and for how long—including overall targets that tell you when to move on. ▶ Build routines with Playlists, automations, repeats, and voice cues. Keep timers, charts, book pages, videos, and notes one tap away. ▶ Record the screen with a camera feed, then turn the video into a Media Track to annotate, loop, and slow down. › See the work add up ▶ PolyNome automatically logs every exercise, tempo, duration, and date. Follow streaks, spot neglected tempos, and compare practice periods. ▶ Add notes to any event and see your cumulative time on that exercise at that moment—revealing how long improvement took. ▶ Print PDF reports or export your history as CSV. Teachers can review what students practiced and read notes made while difficulties were fresh. ◆ PERFORM — Build your band’s click Setlist in seconds. ▶ Create clicks for originals, automatically find the tempo, key, and duration of covers, or import an Apple Music playlist. ▶ See the total running time as you build, and add interval or encore markers showing the duration above each break. ▶ Produce a professional printable Setlist in a couple of taps. › Take everything you need on stage ▶ Attach charts, PDFs, text notes, or forScore links so the right information appears with each click. ▶ If someone starts first, use Tap To Start to bring the click in at their tempo, or use haptics for a silent click you can feel. ◆ ORGANIZE, DISCOVER & SHARE ▶ Keep Rhythms, Clicks, Media, Playlists, Setlists, and Shortcuts organized—and find anything with search, labels, sorting, and filtering. ▶ Discover lessons and examples from Home, explore the free Public Library, or join the Practice Room for live Q&As, support, and courses. ▶ Share with PolyNome users or export MIDI and audio files. ▶ Supports VoiceOver. ▶ Send audio to other apps with Audiobus or Inter-App Audio.
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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.