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
Phonolyth Cascade
Cascade is a versatile reverb and diffusion processor with an experimental edge
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
30 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 included15 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 Phonolyth Cascade: 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
Implement a robust offline mode with full library access.
Assumption to check: Limited offline access to music
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the subscription model and enhance user onboarding.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Add sharing options and collaborative playlists.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search with filters and recommendations.
Assumption to check: Search functionality may lack depth
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
Cascade is a versatile reverb and diffusion processor with an experimental edge. Designed first and foremost with expansive modulated supernatural spaces in mind, it features an extensive set of controls to explore other sonic territories such as stereo widening, transient smearing, hybrid delay/reverb and chorus/flanger/resonator-like effects. Features: - Wide range of diffusion textures spanning from subtle smearing and widening to otherworldly reverberation - Lush randomized modulation - Infinity and Freeze buttons for never-ending reverb bliss - Mix Lock for switching presets while keeping the dry/wet mix constant - Freely resizable UI with light and dark color schemes - Cross-platform preset format for sharing across plugin formats and OSes - 30 factory presets to get you started - Includes an AudioUnit v3 plugin for use in host apps such as GarageBand and AUM, and a standalone app
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 Native
Expo
Zustand
Axios
React Navigation
expo-av
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.
