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
Vox libri
Read your way: accessible, comfortable, and without barriers.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 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 Vox libri: 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 expanding partnerships with publishers or independent authors.
Assumption to check: Limited audiobook selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing features and discussion forums.
Assumption to check: Lack of social features for sharing and discussing audiobooks.
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline mode for downloaded audiobooks.
Assumption to check: No offline listening options.
Validate with people who use this workflow before building.
Hypothesis 4
Add a recommendation engine to enhance user experience.
Assumption to check: No personalized recommendations based on listening history.
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
Read your way: accessible, comfortable, and without barriers. Vox Libri is designed to help anyone read books and documents in a flexible, personalized, and fully accessible way. Whether you prefer reading on screen, using a braille display, or listening with high-quality text-to-speech, enjoying your content has never been easier. Lightweight, fast, and built for readers who want a comfortable, distraction-free, and inclusive reading experience. Key Features • High-quality text-to-speech for natural and expressive read-aloud. This application uses the voices installed on your device. • Braille reading mode, fully compatible with braille displays. • Customizable reading screen with adjustable font, size, colors, spacing, and themes. • Support for major document formats, including TXT, PDF, DOCX, RTF, HTML, Markdown, and EPUB. • Fully accessible interface, optimized for blind users, low-vision users, and people with reading difficulties. • Smart navigation through chapters, headings, pages, bookmarks, and document sections. • Hands-free reading via headphone controls. • On-device AI translation, summarization, and simplification when supported by the device. • Full Spanish, English, Italian, French and Greek support across the interface and reading experience. Vox Libri is perfect for people with dyslexia, low vision, braille users, students, professionals, or anyone who wants a more comfortable and customizable reading experience. Carry your entire library with you and read however you prefer.
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
React Navigation
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.
