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.
Goodreads is the free book tracker and reading community for everyone who loves books
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Goodreads is the free book tracker and reading community for everyone who loves books. With more than 150 million members, it is the world's largest community of readers. Keep track of everything you've read, discover your next favorite book, save it to your Want to Read shelf, and update your reading progress as you go. Then share your shelves and progress with friends who love books as much as you do. Rate and review books, read honest reviews from other readers, join book club groups, and talk about the stories you can't stop thinking about. Behind all those conversations is a book tracker that makes staying organized easy. Add a book in seconds by scanning the cover or searching by title, author, or ISBN. Add it to your Want to Read, Currently Reading, Read, or Did Not Finish (DNF) shelf, or create your own book lists for beach reads, favorite series, or the books your friends keep recommending. Want to read more this year? Set a personal goal with the Reading Challenge, adjust it anytime, and follow along as friends work toward theirs. Take on seasonal challenges and watch your reading tracker fill up as you go. When the year ends, Year in Books recaps every page you read. Reading is better with company. Follow friends to discover what they're reading and find more books to read, rate the books you finish, and check reviews from millions of readers before you pick your next one. Join a book club through Goodreads groups to read along and share your thoughts, or recommend a favorite to a friend who needs it. You can even vote for your favorite books of the year in the Goodreads Choice Awards. GOODREADS FEATURES FREE BOOK TRACKER, LOG & LISTS • Rate books with half, quarter or whole stars, share your review, and like or comment on reviews from other readers. • Book Scanner: Scan a cover or search by title, author, or ISBN to add any book to your book tracker in seconds. • Reading tracker: Organize your Read, Currently Reading, and Want to Read shelves, plus custom book lists for any genre or mood. • Did Not Finish shelf: Keep track of the books you set aside, so your reading history tells the whole story. • Update your progress by page or percentage and keep a book log of every title you finish. • Set a yearly reading goal with the Reading Challenge and earn achievements in seasonal challenges. • Look back on your Year in Books, a recap of every book from your reading tracker. DISCOVER NEW BOOKS TO READ • Get personalized recommendations based on the books you've read and loved. With millions of ratings and reviews, discover what's trending this week in your favorite genres, from romance to historical fiction, and find new books to read. • Get ahead of the next big release with our Most Anticipated Books lists, based on what readers are adding to their Want to Read shelves, plus author interviews and featured lists. • Use the Book Scanner at the bookstore or library to pull up ratings and reviews instantly and decide if it's your next read. READING COMMUNITY & BOOK CLUBS • Connect with a reading community of more than 150 million members. • Join book club groups to start discussions and meet readers who share your taste. • Keep up with what friends add to their shelves and how their reading goals are going. • Recommend books to friends and vote for your favorites in the Goodreads Choice Awards. Whether you're logging your latest read or discovering your next obsession, Goodreads is the free reading tracker made for readers like you. Join the community and start building your shelves today. 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 >
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
Assumption to check: Difficult to find books in certain genres
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited community engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited customization of user profiles
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.