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
MyBook: books and audiobooks
– E-books and audiobooks, including free books
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
3,801 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 MyBook: books and audiobooks: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
– E-books and audiobooks, including free books – Catalog updated daily – Save books and read offline – Personalized recommendations – Full synchronization between iPhone and iPad – Citations, notes, and reviews – We recommend the best books in search results – Completely legal catalog – all the books' authors receive royalties *Activate your free trial period When you first subscribe, you get a free 14 day trial period. If you agree to sign up for the trial period, we will automatically renew your subscription for one month 24 hours before the trial period ends. In this case, the payment method linked to your iTunes account will be charged the monthly price of your selected subscription. If you do not want to pay for a subscription, you can disable auto-renewal at least 24 hours before the trial period ends. You can disable auto-renewal in your iTunes account settings at any time. If you purchase a subscription during the trial period, the unused time from the trial period will be lost. By signing up for a subscription, you agree to the terms of use and privacy policy. Please familiarize yourself with the following information: https://mybook.me/offer/ https://mybook.me/privacy_policy/ * * * Keep in mind that our app supports iOS 12.0 and all later versions. Check and see if you need to update your operating system. * * * We want to make MyBook the most convenient book app, so we're always glad to hear about your ideas and suggestions. If something isn't working for you, contact us at [email protected] See you in MyBook!
Written user reviews are not shown here. Check current App Store reviews >
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
Offer more free content or an ad-supported model.
Assumption to check: Limited free content compared to paid subscriptions.
Validate with people who use this workflow before building.
Hypothesis 2
Implement better algorithms for search optimization.
Assumption to check: Search functionality can be slow and inaccurate.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription options with clearer descriptions.
Assumption to check: Subscription plans can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Streamline the UI for a more focused experience.
Assumption to check: User interface may feel cluttered with too many options.
Validate with people who use this workflow before building.
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
Axios
Native Base
React Navigation
React Query
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.
