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
Bound - Audiobook Player
Listen to your favorite DRM-free audiobooks with Bound.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
2,013 ratings · Top 15%
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 Bound - Audiobook Player: 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
Expand library with partnerships with publishers.
Assumption to check: Limited audiobook selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Provide more granular control for playback speeds.
Assumption to check: Inconsistent playback speed options
Validate with people who use this workflow before building.
Hypothesis 3
Add features to share audiobooks with friends.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline downloads for audiobooks.
Assumption to check: No offline listening options
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
Listen to your favorite DRM-free audiobooks with Bound. Bound allows you to import audio files from various cloud services and play them back in a beautiful modern interface. Bound will automatically save your listening position so that you never lose your place. Supported Audio File Types (DRM-free only): .mp3, .m4a, .m4b, .aac Download - Dropbox and Microsoft OneDrive. - Apple Files. - Web Uploader for importing from your computer via WiFi. Manage - Move audio files between books. - Change cover art. - Sort based on author, title, recently added, and recently played. - Rename title and author. - Choose between a number of fun themes. - Dark mode support. Play - Automatically saves playback location as you progress through the book. - Independently configure seek forward and seek backward times. - Chapter support for audio files with embedded chapters (.m4a / .m4b / OverDrive .mp3). - Change playback speed from 0.5X to 3.0X. - Smart Rewind when returning to your book after a while. - Sleep Timer with configurable time or at the end of a chapter. - Manually bookmark locations that you want to return to. - CarPlay support. If you enjoy using Bound, please consider writing a review.
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-slider
BUILD KIT DIFFICULTY
Intermediate
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.
