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
Deck-Man: Cassette Player
Deck-Man (formerly referred to as "duo-man") is a playful music player that brings the look, feel, and simplicity of classic portable cassette players to your iPhone Duo.
$4.99 · In-app purchases
OVERALL US RANK
#24
Paid · all categories
REVENUE (Est)
$252K/mo
$147K - $356K
RATING
★ 4.6
168 ratings · Top 15%
Evidence scope: #24 is the current overall US Paid chart position. 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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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.
What's included
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 Deck-Man: Cassette Player: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Deck-Man (formerly referred to as "duo-man") is a playful music player that brings the look, feel, and simplicity of classic portable cassette players to your iPhone Duo. Turn your phone into a retro cassette player. No ads, no subscriptions, no in-app purchases. Just your music, with a little nostalgia. A Cassette Player Reimagined: Open your phone, browse your favorite albums as cassette tapes, insert one into the player, and close it to start listening. The Little Details make that make it fun: Browse your albums as cassette tapes and load them into your player. Enjoy familiar play, pause, fast-forward, and rewind controls. Hear authentic mechanical clicks and cassette sounds recorded from a real portable cassette player. Enjoy playful interactions inspired by the original cassette-playing experience. Your Music Your Way Listen to your favorite albums with support for Apple Music and local music files. Buy Once. No ads. No Upsells. No subscriptions. No in-app purchases. No interruptions. Deck-Man has been featured by TechCrunch, 9to5Mac, MacRumors, and TechRadar for its imaginative take on the classic portable cassette player.
Written user reviews are not shown here. Check current App Store reviews >
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
Generous offline download limits
Assumption to check: Can't play offline
Validate with people who use this workflow before building.
Hypothesis 2
Better personalization with explicit feedback
Assumption to check: Algorithm doesn't understand taste
Validate with people who use this workflow before building.
Hypothesis 3
Limited on-demand plays for free users
Assumption to check: Shuffle-only on free tier
Validate with people who use this workflow before building.
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 AV
Supabase
RevenueCat
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
