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.
App Overview
zpunk
zpunk
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for zpunk: 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Add personalized recommendations and a better search algorithm.
Assumption to check: Limited music discovery features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social media sharing options for playlists and songs.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Offer limited offline listening for free-tier users.
Assumption to check: No offline listening for free users
Validate with people who use this workflow before building.
Hypothesis 4
Continuously improve the app based on user feedback.
Assumption to check: Poor user ratings due to lack of features
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
zpunk zpunk is a pocket groovebox built for fast music creation. Tap in a beat, chop a sample, sketch a bassline, and build patterns in seconds. Inspired by classic hardware grooveboxes, zpunk brings a fast, hands-on workflow to mobile so you can capture ideas anytime. Whether you're experimenting with rhythms, building loops, or sketching full grooves, zpunk keeps the focus on speed and creativity. Features Drum Sequencer Program rhythms on a 16-step drum grid with multiple drum voices. • Kick, snare, clap, hats, and percussion • Fast step editing workflow • Per-drum volume controls • Multiple hits per step Sample Chopper Load audio and slice it into playable pieces. • Import your own samples • Automatic or manual slice points • Trigger slices from the sequencer • Pitch control for creative sampling Synth Step Sequencer Create basslines and melodies with a built-in synth sequencer. • Step-based note editing • Adjustable note lengths • Live editing while the sequencer runs Chord Track Build chord progressions quickly. • Step-based chord sequencing • Ideal for pads and harmonic layers • Combine with drums and samples Pattern Chaining Arrange patterns into longer sequences. • Build song structures from patterns • Chain multiple grooves together • Ideal for live sketching and experimentation Designed for fast workflow zpunk focuses on quick musical ideas, not complicated menus. Create beats, chop samples, and build patterns in seconds with a simple touch interface designed for mobile. Perfect for • Beat makers • Electronic music producers • Live loop creation • Musical sketching and experimentation Import your own sounds Load your own samples through the Files app and start building beats immediately. Built for mobile music creation zpunk brings the spirit of classic grooveboxes and pocket music devices to your phone, giving you a powerful music sketchpad wherever inspiration hits.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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BUILD KIT DIFFICULTY
Advanced
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.
