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
Book Preview
Preview and manage your ebooks from the Files app on iPhone and iPad, with support for the most common ebook and comic formats, including EPUB, MOBI, FB2, DJVU, CBZ, CBR and CB7.
$7.99
PRICE
$7.99
No 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 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 Book Preview: 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
Offer a wider selection of book previews or user-generated previews.
Assumption to check: Limited book previews available
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline functionality for previously viewed previews.
Assumption to check: No offline access to book previews
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a recommendation engine based on user preferences.
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to leave reviews and ratings for books.
Assumption to check: No user reviews or ratings
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
Preview and manage your ebooks from the Files app on iPhone and iPad, with support for the most common ebook and comic formats, including EPUB, MOBI, FB2, DJVU, CBZ, CBR and CB7. Designed as a companion app to the macOS version, it makes it easy to open, inspect and preview your ebook files on iOS and iPadOS. • Supported Formats: EPUB/KEPUB, MOBI, DJVU, FB2, CBZ/CBR/CB7 • EPUB and MOBI: View cover, metadata, full text and embedded images • DJVU: Browse all pages • FB2: View cover and full text • CBZ/CBR/CB7: Browse all images • Quick Look support from the Files app • Open files directly using “Open With” • Works great alongside the macOS Quick Look extension • Conveniently preview ebook files on the go, without needing your Mac Thumbnails and previews are generated for most supported files where possible. Note: Some files may fail to load or preview for various reasons. If you can, send us the file that doesn’t work and we’ll try to investigate the problem. DRM-protected books are not supported.
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
Axios
Zustand
React Navigation
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.
