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
Goodreads: Book Tracker & More
Discover stories that matter to you, from readers like you
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
753,348 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 included17 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 Goodreads: Book Tracker & More: 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
Implement advanced filtering options by genre and tags.
Assumption to check: Difficult to find books in certain genres
Validate with people who use this workflow before building.
Hypothesis 2
Add features for discussions and book clubs.
Assumption to check: Limited community engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Create a more subtle, user-friendly paywall design.
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their profiles with themes and layouts.
Assumption to check: Limited customization of user profiles
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
Discover stories that matter to you, from readers like you. Goodreads is the world's largest community of readers. Find new and interesting books by browsing personalized recommendations based on books you've read and your favorite genres. See what your friends are reading, write book reviews, and keep track of what you want to read. Goodreads is a free service for book tracking, recommendations and reviews. Use our barcode scanner the next time you are in a bookstore. Add the book in your hands to your "Want To Read" shelf and browse reviews before buying. Features: • Get personalized recommendations and discover new books based on your tastes. • Goodreads Choice Awards: vote for your favorite books of the year and see the winners! • Participate in the Reading Challenge! • Book cover and barcode scanner! • Keep a want-to-read list. • See book reviews and updates from your friends. • Discover new books and explore popular book lists. • Rate and review books you read. • Share notes and progress updates as you read. • Recommend books to friends. • Join online book clubs and connect with other readers. By using this app, you agree to Goodreads’s Terms of Use (https://www.goodreads.com/about/terms) and Privacy Policy (https://www.goodreads.com/about/privacy).
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
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BUILD KIT DIFFICULTY
Expert
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.
