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
Perfect Viewer X
Perfect Viewer X is a brand new cross-platform version of the classic Perfect Viewer, a professional reader designed for image and e-book enthusiasts
$4.99 · In-app purchases
PRICE
$4.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Perfect Viewer X: 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 font styles, sizes, and background colors.
Assumption to check: Lack of customization options for reading experience
Validate with people who use this workflow before building.
Hypothesis 2
Implement better filtering and sorting options for books.
Assumption to check: Difficult navigation for large libraries
Validate with people who use this workflow before building.
Hypothesis 3
Add functionality to share book recommendations with friends.
Assumption to check: Limited social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline reading for downloaded books.
Assumption to check: No offline access to books
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
Perfect Viewer X is a brand new cross-platform version of the classic Perfect Viewer, a professional reader designed for image and e-book enthusiasts. Whether you're a comic fan, photographer, or e-book reader, Perfect Viewer X delivers the best reading experience on your iPhone, iPad, and Mac. Supports Over 20 File Formats • Images: JPEG, PNG, WebP, AVIF, JPEG XL, HEIF, TIFF, GIF, BMP, etc. • Archives: ZIP, RAR, 7Z, CBZ, CBR, CB7, TAR, LZH, etc. • E-books: EPUB, MOBI, AZW, FB2, TXT, HTML • Documents: PDF, DjVu Professional Image Processing • Automatic color correction and contrast adjustment • Hue, saturation, and brightness control • Image sharpening and edge cropping detection • Grayscale and color inversion modes • Multiple zoom and fit modes Flexible Reading Modes • Automatic single/dual page switching • Left-to-right or right-to-left reading • Vertical scrolling mode • Auto-rotation feature • Full-screen immersive reading Cloud & Network Storage Integration • iCloud Drive support — open and sync your files across all your Apple devices • Full Google Drive support • SMB/CIFS network share support • FTP/FTPS/SFTP protocol support • WebDAV server support • Browse and open remote files directly • Automatic login and authentication Highly Customizable • Customizable touch zones and gestures • Hardware key mapping • Quick action bar customization • Day/Night themes • Detailed display settings Complete File Management • Built-in file browser • Bookshelf and favorites • Reading history • Bookmark feature • Settings export/import E-book Exclusive Features • Table of contents navigation • Full-text search • Text selection • Custom fonts and sizes • Paragraph spacing adjustment Advanced Features • Slideshow auto-play • Magnifier and balloon magnifier • Quick screen brightness adjustment • Preference management • Multi-language interface
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
React Navigation
Zustand
React Native Paper
Expo File System
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.
