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
Epub Reader -read epub,chm,txt
Epub Reader: Ultimate Ebook & Comic Viewer
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
11,445 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 included16 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 Epub Reader -read epub,chm,txt: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Epub Reader: Ultimate Ebook & Comic Viewer Experience seamless reading with a powerful, all-in-one document viewer designed for iOS. Now fully compatible with Kindle and Amazon ebook formats! All-in-One Format Support • Kindle Formats: MOBI, AZW, AZW3, AZW4, PRC • Ebooks & Docs: EPUB, PDF, CHM, RTF • Comics & Archives: CBZ, CBR, ZIP, RAR, 7Z, GZIP, TAR Key Features: • Smart Navigation: Effortlessly browse and skip chapters with the interactive Table of Contents. • Personalized Reading: Highlight text, take inline notes, and save your favorite pages with bookmarks. • Fully Customizable: Adjust font sizes and layouts to read comfortably, day or night. • Easy File Transfer: Instantly import books via Wi-Fi (desktop browser) or iTunes File Sharing. #Permanent professional version: * Make a one-time purchase and resume purchases anytime, anywhere. #Annual professional version: * Annual auto-renewable subscription, automatic renewal upon expiration. * Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's iTunes Account Settings after purchase. Privacy Policy: https://junjie-5cfc2.web.app/epubreader/privacypolicy.html Terms of Use: https://junjie-5cfc2.web.app/epubreader/terms.html Contact us: [email protected]
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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 to support more formats like PDF and DOCX.
Assumption to check: Limited file format support compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Improve memory management and error handling.
Assumption to check: Occasional crashes during file loading
Validate with people who use this workflow before building.
Hypothesis 3
Implement a modern UI with updated design patterns.
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 4
Add features for highlighting and note-taking.
Assumption to check: Lack of advanced reading features like annotations
Validate with people who use this workflow before building.
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
Zustand
react-navigation
expo-file-system
react-native-paper
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.
