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
AudioBooks Unlimited to Kindle
Love books? Love Kindle? You’ll love Audiobooks Unlimited to Kindle—the smart way to turn your Kindle library into endless listening.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.5
438 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 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 AudioBooks Unlimited to Kindle: 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
Enhance the library with curated selections and user-generated content.
Assumption to check: Limited audiobook selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline playback for downloaded audiobooks.
Assumption to check: No offline listening feature.
Validate with people who use this workflow before building.
Hypothesis 3
Use user data to suggest audiobooks based on listening habits.
Assumption to check: Lack of personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 4
Add advanced filters and search options for easier navigation.
Assumption to check: Inadequate search functionality.
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 books? Love Kindle? You’ll love Audiobooks Unlimited to Kindle—the smart way to turn your Kindle library into endless listening. With advanced AI text-to-speech, your Kindle books and Kindle Unlimited titles transform into natural-sounding audiobooks. Perfect for commuting, working out, cooking, or winding down before bed. Why you’ll love it: - Free Alternative to Audible - Transform any Kindle book into an audiobook with lifelike AI voices - Works with Kindle Unlimited & Amazon Kindle titles - Replace endless scrolling with endless listening - Reach your reading goals faster by listening anywhere, anytime - Customize your listening with speed controls and voice options Who is it for? Readers who love Kindle, Kindle Unlimited, Audible, and audiobooks free apps—now you can enjoy the best of both worlds. Stop choosing between reading and listening. With Audiobooks Unlimited to Kindle, your Kindle library becomes your personal audiobook collection—always with you, always ready. Kindle® is a registered trademark of Amazon Technologies, Inc. This app is not affiliated with or endorsed by Amazon. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
TypeScript
React Navigation
Zustand
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.
