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 - Bookshelf
Got a growing TBR list? See great book recommendations, but forget them later? Meet TBR Bookshelf!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
4,261 ratings · Top 15%
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 TBR - Bookshelf: 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 personalized recommendations based on user reading history.
Assumption to check: Users often find it difficult to discover new books.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing capabilities to connect with friends.
Assumption to check: Limited social features for sharing books with friends.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify pricing structure and clearly explain premium features.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a more visual progress tracker for books.
Assumption to check: Some users report difficulty in tracking reading progress.
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
Got a growing TBR list? See great book recommendations, but forget them later? Meet TBR Bookshelf! Easily track books you want to read, are currently reading, or have finished with no limits. Rate and review books once you’ve read them and log your favorite moments using our quick and intuitive rating system. Browse public ratings to see a book’s POV, tropes, reread rate, and up to four genre-specific ratings. For example, Romance tracks Spice, Fluff, Humor, and Tear. All ratings are anonymous, so you can be honest with your reviews. Within our rating system, you can log: * Reading format * 5 Star Rating including half stars * Up to four genre ratings * If you would reread a book * DNF (Did Not Finish) * Favorite characters and quotes * Series and standalone books * Pro quotes and annotations (Paid Subscription Required) * Any additional thoughts about the book Celebrate your reading milestones with special book confetti and earn stickers for completing books and certain book tropes. Exclusive Pro features include: * Book tropes * Book playlists to track songs (cannot be played within the app) * POV format and amount * TV show and movie adaptation ratings * Four seasonal ratings All users can create custom yearly reading goals. When you finish a book, it is automatically added to your yearly reading goal bookshelf. Pro users can also fully customize their bookshelves with color themes, bookshelf items, and layouts. TBR Bookshelf makes managing your TBR list fun, easy, and satisfying. Track books, set reading goals, log quotes, and discover new reads all in one place. With customizable shelves, anonymous ratings, and a supportive community, staying on top of your reading has never been more enjoyable. Join TBR Bookshelf, a woman-owned and operated company, BookTok’s favorite, and trusted by millions of readers. TBR Bookshelf is free to download and use. No account or sign-up is required. TBR Bookshelf Pro includes a 7-day free trial and then options for a monthly plan ($4.99), a 6-month plan ($19.99), or a yearly plan ($29.99). All other features remain free indefinitely. A subscription will be applied to your iTunes account at the end of your free trial. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. You can cancel anytime in your iTunes account settings. Any unused portion of a free trial will be forfeited if you purchase a subscription. These prices are for United States customers. Pricing in other countries may vary. Note: This app is for tracking your reading journey. Reading is not available within the app. Privacy Policy: http://jordanpetersonstudio.com/tbr-bookshelf-privacy-policy/ Terms of Service: http://jordanpetersonstudio.com/tbr-bookshelf-terms-of-service/
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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
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Zustand
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.
