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
ShelfPlayer
ShelfPlayer is a powerful iOS application for listening to audiobooks and podcasts, designed for users with self-hosted Audiobookshelf libraries
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
134 ratings · Top 50%
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 included18 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 ShelfPlayer: map the core Books 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
Focus on partnerships with publishers to expand the library.
Assumption to check: Limited audiobook library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline storage for downloaded audiobooks.
Assumption to check: No offline access for audiobooks
Validate with people who use this workflow before building.
Hypothesis 3
Create a clear, user-friendly subscription overview and management section.
Assumption to check: Subscription management can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Add features for sharing favorite books and audiobooks on social media.
Assumption to check: No social sharing 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
ShelfPlayer is a powerful iOS application for listening to audiobooks and podcasts, designed for users with self-hosted Audiobookshelf libraries. Built in Swift 6 for iOS 18+, ShelfPlayer is fast, privacy-respecting, and deeply integrated with the Apple ecosystem. ShelfPlayer does not include any media content. A running Audiobookshelf instance is required to use the app. Features • Unified audiobook and podcast app: A single, native experience for audiobooks, podcasts, episodes, authors, narrators, series, collections, and playlists. • Multi-server support: Works with multiple Audiobookshelf servers and libraries at the same time. • Flexible authentication: Supports both username/password and OpenID sign-in. • Custom request headers: Additional HTTP headers can be configured for advanced setups. • Listen Now: Continue listening and discover content across connected libraries. • Global and library search: Fast search across books, podcasts, people, series, and episodes. • Playback queues: Includes both a main queue and an Up Next queue. • Chapter navigation: Chapter-level controls are available directly in playback views. • Playback speed controls: Combines quick presets with precise rate tuning. • Configurable skip intervals: Skip forward and backward durations can be tailored to personal preference. • Sleep timer: Supports both time-based and chapter-based timers, with Live Activity integration. • AirPlay and media controls: Native integration with AirPlay and Apple system media controls. • Bookmarks with notes: Save key moments with optional notes. • Progress synchronization: Listening progress and sessions stay in sync with Audiobookshelf. • Listening history: Detailed, item-level listening timelines are available. • Daily listening tracking: Tracks listening time with optional daily goals. • Offline mode and downloads: Downloaded content remains available when offline. • Automatic convenience downloads: Background downloads cover Listen Now, podcast, and series content. • Collections and playlists: Built-in tools for creating, editing, and organizing collections and playlists. • PDF viewer: Opens attached PDF documents in-app. • Home Screen widgets: Includes Start, Listen Now, and Listened Today widgets. • Live Activities and Dynamic Island: Sleep timer controls stay accessible on Lock Screen and Dynamic Island. • Siri, App Intents, and Shortcuts: Playback and automation workflows are fully integrated with Apple automation tools. • CarPlay support: Library browsing and playback controls are available in CarPlay. • Spotlight integration: Indexed content appears in system search with deep links back into the app. • Home Screen quick actions: Common playback and search actions are available from the app icon. • Native iPhone and iPad interface: Optimized layouts with customizable tabs, sorting, and filters.
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
Supabase
React Navigation
Zustand
React Native Reanimated
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.
