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 of the Month
Every month, we bring you a shortlist of the best new fiction we’ve come across, with a mix of books likely to be in your sweet spot as well as intriguing outliers
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
83,327 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included20 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 of the Month: 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
Expand the library with more titles and genres.
Assumption to check: Limited selection of books each month.
Validate with people who use this workflow before building.
Hypothesis 2
Implement reminder notifications for selections.
Assumption to check: Users often forget to select books.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the checkout flow and provide clearer instructions.
Assumption to check: In-app purchase process can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance algorithm for better personalized book suggestions.
Assumption to check: Lack of personalized recommendations.
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
Every month, we bring you a shortlist of the best new fiction we’ve come across, with a mix of books likely to be in your sweet spot as well as intriguing outliers. You pick what speaks to you, we send it your way. We’ll see you again in four weeks. Happy reading :) More than just books: Get access to app exclusive content like reviewing the books you’re loving, tracking your path to rewards, and crushing digital challenges (for IRL prizes). Read with your ears: Fit curated audiobooks from every genre into your commute, errands, trips, chores, and relaxation. We make big breaks happen: We’re committed to celebrating and championing emerging authors. Listen to our authors on our podcast, Virtual Book Tour. This app was designed and developed in-house by Book of the Month in New York, NY.
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
Supabase
react-query
@supabase/supabase-js
expo-router
BUILD KIT DIFFICULTY
Advanced
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.
