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 Level Checker
** Over 180k+ AR books and 1 million+ ISBN! **
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.6
14 ratings · Top 50%
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 included16 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 Level Checker: 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 a more advanced recommendation algorithm.
Assumption to check: Limited book recommendations after scanning.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance scanning reliability with better error handling.
Assumption to check: Inaccurate barcode scanning results.
Validate with people who use this workflow before building.
Hypothesis 3
Redesign UI for a more modern look and feel.
Assumption to check: User interface feels outdated.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing and user reviews to improve engagement.
Assumption to check: Lack of social features.
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
** Over 180k+ AR books and 1 million+ ISBN! ** ** Cost of one cup of coffee for lifetime usage. ** Teachers, parents, students, and librarians: are you tired of manually searching AR level, AR points, and AR quiz numbers for books which are AR leveled but not labeled? This is the app for you! This Book Level Checker App provides accurate AR level information. Super fast ISBN barcode scanner! Easily share and print your scan list in PDF format. This Book Level Checker App even provides a reading list tracking feature. As time goes, you will be amazed by how many books your kids/students have read. Key benefits you can get: * Fast ISBN barcode scan. Save your valuable time. * Accurate AR book information. * Large database. 180k+ AR books and 1 million+ ISBN. * Don’t have the barcode? Use the manual option to key in the ISBN. * Don't have a book in hand? Search by title and author. * Similar books suggestion. You don't need to manually search by title and author. * Easy-to-manage scan history. * Easy sharing and printing in the way you want. * Reading list management. Easily add or remove books and share list to others. * No ads. Perfect for: * Choosing books with the right reading level for your kids. * Students who can pick AR books by themselves * School/classroom library management to assist with correct AR level labeling. Note: * AR and Accelerated Reader are registered trademarks of Renaissance Learning. Book Level Checker App and Apuck LLC are not affiliated with Renaissance Learning, Inc.
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-navigation
expo-camera
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.
