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 Tracker: Lexi
A calm, nocturne-themed companion for the books you read before bed.
$0.99 · In-app purchases
PRICE
$0.99
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'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 Tracker: Lexi: 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
Incorporate social sharing features to enhance user engagement.
Assumption to check: Limited social features for sharing book lists and reviews
Validate with people who use this workflow before building.
Hypothesis 2
Add insights based on user reading history to encourage more usage.
Assumption to check: No advanced analytics on reading habits
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline access to reading lists and book details.
Assumption to check: Lacks offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with APIs like Google Books for comprehensive book data.
Assumption to check: No integration with external book databases
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
A calm, nocturne-themed companion for the books you read before bed. Build a personal library, track your progress page by page, and keep your thoughts close with notes tied to a book, a chapter, or a single page. Every reading night is gathered into a quiet journal and calendar so you can watch your habit take shape over time. FEATURES - Personal library: add books with title, author, page count, and cover - Snap a cover photo and let the app read the title and author for you - Track reading status: To Read, Reading, and Finished - Log the pages you read each night and watch your progress grow - Notes by scope: attach thoughts to a whole book, a chapter, or an exact page - Reading journal: every logged day, gathered book by book - Calendar view: see the nights you read at a glance - Favorites and flexible sorting: order your shelves by pages read, favorites, or most notes - A deep, moonlit dark interface designed to be easy on nighttime eyes Everything stays on your device. No account, no sign-up: just you and your books.
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
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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.
