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
Litres: Audio
Litres: Audio application is the convenient way to choose and listen to the favorite audiobooks
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
2,675 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 Litres: Audio: 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
Implement advanced filtering and sorting options for better content access.
Assumption to check: Limited search functionality often leads to poor discoverability of content.
Validate with people who use this workflow before building.
Hypothesis 2
Provide a clear, simple breakdown of subscription benefits and a comparison chart.
Assumption to check: Subscription options can be confusing, leading to user frustration.
Validate with people who use this workflow before building.
Hypothesis 3
Ensure robust error handling and playback stability.
Assumption to check: Occasional app crashes during playback.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for users to share audiobooks with friends or create groups.
Assumption to check: Lack of social features for sharing recommendations.
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
Litres: Audio application is the convenient way to choose and listen to the favorite audiobooks. With the built-in audiobook store you get the access to more than 15000 LitRes audiobook catalogue from hot new releases to all-time classics – the biggest catalogue of audiobooks in russian App Store. Features: - listen and evaluate a book fragments, before you decide to buy a full audiobook. We have the longest free samples in App Store – 10 minutes to 1 hour for selected books; - book shelf: all the audiobook purchases you’ve ever made are available on all devices and Litres website (assuming the same user account is used); - detailed book descriptions; - background audiobook playback; - possibility to read book reviews written by the customers and submit your own; - author pages with a biography, reviews, one click access to book series; - offline playback – for the books downloaded in advance. Should you have questions on how the app works, new feature suggestions, or if you faced a problem with book purchase / download – please drop us a note at [email protected]. Note that Litres app can collect anonymous usage stats. «LitRes» is the number №1 retailer of digital books in Russia. We are trusted by the leading Russian publishing houses and authors. Company «LitRes» was founded in 2006 and eventually evolved into the largest and well-known digital book retailer in Russia. Today LitRes book store contains tens thousands of books and several thousands of audiobooks.
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.
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BUILD KIT DIFFICULTY
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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.
