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
Zudio music
Zudio generates music in Ambient, Chill, Kosmic and Motorik styles inspired by Brian Eno, Moby, St Germain, Kraftwerk, Jean-Michel Jarre, Tangerine Dream and The Electric Buddha Band
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
11 ratings · Top 5%
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 included14 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 Zudio music: 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
Allow users to download entire playlists for offline access.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social sharing options for playlists and songs.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Add a lyrics sync feature that shows lyrics as the song plays.
Assumption to check: No lyrics display
Validate with people who use this workflow before building.
Hypothesis 4
Implement adaptive streaming quality based on user connection.
Assumption to check: Inconsistent audio quality
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
Zudio generates music in Ambient, Chill, Kosmic and Motorik styles inspired by Brian Eno, Moby, St Germain, Kraftwerk, Jean-Michel Jarre, Tangerine Dream and The Electric Buddha Band. You can select a single style or play endless mode in all styles. There's also a sleep timer for automatic stop. The visuals are interactive and match the music. You can change the instruments by tapping or swiping. You can save songs, share them or further edit the MIDI file in any DAW. On Mac and iPad there is also a Tracks view that shows each of the 7 MIDI tracks, similar to Logic Pro. Zudio runs locally on your device without internet. No subscriptions, no add-ons, no upsells. Buy once and listen forever! -Endless and Evolve modes for continuous play -Sleep timer mode for automatic stop -Save and share songs with friends -Visualizer lets you interact with the music and change instruments -Save MIDI or Audio for use in DAWs like Logic Pro -Billions of possible songs across 4 styles
Written user reviews are not shown here. Check current App Store reviews >
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.
SUGGESTED BUILD STACK
React Navigation
Expo AV
Axios
Zustand
React Native Gesture Handler
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.
