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
CrossPort: EPUB Reader
CrossPort is an EPUB reader built for long books: real two-page spreads, a page curl you can feel, natural voices that read to you, and a recap of the story so far when you come back
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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 CrossPort: EPUB Reader: 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
CrossPort is an EPUB reader built for long books: real two-page spreads, a page curl you can feel, natural voices that read to you, and a recap of the story so far when you come back. It also pairs with e-ink readers running CrossPoint, so your place follows you between phone and reader. READING • Paginated pages with page curl or slide, and two-page spreads in landscape • Themes, fonts, and layout settings to make every book comfortable • Bookmarks, contents, and a scrubber that shows the chapter as you drag, with undo for jumps • Show progress as a percentage or as pages • Import EPUBs from Files, AirDrop, or Share READ ALOUD • Listen to any book, with every word highlighted as it's spoken and pages that turn on their own • Natural neural voices, including 17 PocketTTS voices, or make your own from a short recording • Play from Here: select any sentence to start there • Pronounce As: fix how a name or word is said, for one book or all of them • Keeps playing in the background, with lock screen controls, and picks up where you stopped PREVIOUSLY • Coming back after a break? CrossPort recaps the story up to your place, using Apple Intelligence • Only what you've already read is used, so recaps never spoil what's ahead FIND BOOKS • Browse Project Gutenberg, Calibre content servers, and other OPDS catalogs • Book details with synopses, ratings, and page counts PAIRS WITH YOUR E-INK READER • Works with Xteink X4, X3, and other readers running CrossPoint or compatible firmware • Reading position and bookmarks sync both ways between your phone and your reader • Send books to your reader over WiFi, optimized for e-ink • Make sleep screen wallpapers from your photos, previewed as they'll look on e-ink • Browse, upload, rename, move, and delete files on your reader MORE • Home screen widget with your current book • Siri and Shortcuts: continue reading, check your progress, or send a book to your reader No e-ink reader needed. CrossPort works on its own as a reader on your iPhone. Recaps need an iPhone with Apple Intelligence. Some neural voices need iPhone 13 or later.
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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 personalized recommendations based on user reading habits.
Assumption to check: Limited discovery features for new books
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature for users to share their progress and book reviews.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline access to books and reading progress.
Assumption to check: Poor offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Provide more advanced filtering and sorting options in the library.
Assumption to check: Inadequate filtering options
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
Axios
AsyncStorage
React Navigation
TypeScript
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.
