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
TBR: Book List Reading Tracker
TBR is a fast, elegant and modern place to track your reading
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
6 ratings · Top 30%
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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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 TBR: Book List Reading Tracker: 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 create and customize their own status categories.
Assumption to check: Limited customization options for book status categories
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing options for users to share their reading progress.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Enhance search with filters for genre, author, and reading status.
Assumption to check: Limited search functionality
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline capabilities for users to access their lists without internet.
Assumption to check: No offline access to book lists
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
TBR is a fast, elegant and modern place to track your reading. The books you want to read (your TBR, To Be Read), the books you are reading, and the books you've read. You can also organize your books into custom lists of your own choosing. Get inspiration by reading Book News from our 1000+ curated book news sources. TBR contains a Book News browser, essentially a curated collection of RSS feeds, with links back to the original sources. Bookship will identify books in each story and easily let you save them, remembering where you found the book. TRACK BOOKS Add a book by name by searching our database, or use the easy Barcode Scanner to scan books quickly into TBR. It's great when you're in a bookstore and want to remember a book for later. Using Multi-scan lets you quickly add your entire library right into TBR. Reorder your TBR list by drag-n-drop, so you can change what's coming next. Sort and filter by author, genre, title, publication date and more. Mark books as Reading, or Read, and the books are automatically added to those lists as well, and dates are automatically tracked. Keep Notes about the books you are reading. Use our Share Extension to share pages you are reading on the web to TBR. TBR extracts the books being mentioned so you can easily browse or save them. READING IDEAS TBR’s More Like This tells you related or similar books to a book you're reading. Or get reading ideas by browsing our always-timely Book News, featuring the latest in books from around the web. BOOK NEWS We've curated over a thousand high quality book news sites, and assembled their RSS feeds into a timely, beautiful view into the world of books, with links back to the original sites. You can find news about books by genre, about the books you are reading, or just what's popular right now. Browse our feeds to see news from each source individually, or browse by Channel to see book news about a particular topic. DARK MODE We support dark mode, for a particularly striking view on the world of books. IMPORT, EXPORT, SYNC Import your books from Goodreads. Export your books to a spreadsheet (Excel, CSV). All sync'd with the cloud and with Bookship, our Social Reading app, so you can plan your reading for your reading group or Book Club.
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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
Zustand
Firebase Firestore
React Navigation
date-fns
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.
