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
Voxi Book Player
LOVE AUDIOBOOKS BUT FRUSTRATED WITH COMPLICATED PLAYERS?
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Voxi Book 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
Allow users to customize playback speed and audio enhancements.
Assumption to check: Limited customization options for playback settings
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline access to downloaded audiobooks.
Assumption to check: No offline listening feature
Validate with people who use this workflow before building.
Hypothesis 3
Add functionality for users to share their favorite audiobooks.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Introduce personalized audiobook recommendations.
Assumption to check: No recommendations based on listening habits
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
LOVE AUDIOBOOKS BUT FRUSTRATED WITH COMPLICATED PLAYERS? You've built your audiobook collection over the years—downloads, ripped CDs, converted ebooks. But finding a player that just works, without subscriptions, complicated syncing, or draining your battery, feels impossible. Voxi is designed for audiobook lovers who want simplicity without sacrificing power. Import your files, organize your library, and start listening in seconds. Everything stays on your device. No account required. No internet needed. SMART CHAPTER NAVIGATION Tired of hunting for chapter 15 in a 12-hour audiobook? Voxi reads CUE files to give you instant chapter access. Import the CUE file with your audio, and every chapter appears with its title and start time. Tap to jump. Navigate 50+ chapters as easily as flipping pages. BACKGROUND PLAY THAT WORKS Listen, then check email, browse, or lock your screen. Your book keeps playing. Control playback from the Control Center or Lock Screen and see chapter info—all without opening the app. NEVER LOSE YOUR PLACE Life interrupts. Your phone dies. With Voxi, it doesn't matter. Your exact position is saved automatically—down to the second. Switch books or come back days later, and you're right where you left off. FLEXIBLE PLAYBACK CONTROL Set your perfect pace with speed control from 0.5x to 2.0x. Speed up a thriller, slow down for study. Use the Jump Interval (5-60 sec) for quick rewinds. The Sleep Timer (5-90 min) lets you drift off without draining battery. SYSTEM VOLUME LIMITER (NEW!) Some headphones play too loud even at the system's lowest setting. Voxi's System Volume Limiter gives you finer control, letting you set a comfortable maximum volume for safe, enjoyable listening. PREFERENCES & CUSTOMIZATION Voxi molds to your habits. Choose your interface Language, Theme (Light/Dark/System), and Font. Adjust the Font Scale manually or use Dynamic Type. Fine-tune playback with a Volume slider (10%-100%) and decide if finished files Restart. Lock the screen in portrait with Orientation Lock, set an Auto Shutdown time, and toggle Listening Statistics. [BETA] CLOUD SYNC Keep your Settings and Listening Statistics in sync across your devices (optional Beta feature). TECHNICAL DETAILS • Formats: MP3, M4A, M4B, FLAC, WAV • Chapters: Full CUE file support • Storage & Privacy: 100% local. No tracking, no data collection. • Core Features: Auto-Play & Position Memory are always on. No subscriptions. No ads. No limits. Download Voxi and start listening today. Happy listening!
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
zustand
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.
