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
Goodnight, Construction Site
** The #1 New York Times bestseller! **
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
113 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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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.
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/
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 Goodnight, Construction Site: 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
Add engaging animations and interactive elements to enhance storytelling.
Assumption to check: Limited interactivity or animations in stories.
Validate with people who use this workflow before building.
Hypothesis 2
Offer bundled purchases or subscription model for better value.
Assumption to check: High price point for single book purchase.
Validate with people who use this workflow before building.
Hypothesis 3
Improve library organization with tags and search functionality.
Assumption to check: Difficulty in managing library and downloads.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for smoother experience across all devices.
Assumption to check: Inconsistent performance on older devices.
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
** The #1 New York Times bestseller! ** As the sun sets behind the big construction site, all the hardworking trucks get ready to say goodnight. One by one, Crane Truck, Cement Mixer, Dump Truck, Bulldozer, and Excavator finish their work and lie down to rest— so they'll be ready for another day of rough and tough construction play! Explore animated pictures, learn new vocabulary, and personalize the story with your own narration. With irresistible artwork by best-selling illustrator Tom Lichtenheld and sweet, rhyming text, this book will have truck lovers of all ages begging for more. Explore the Story: - ENCOURAGE literacy skills with highlighted narration - LEARN new words by tapping pictures - RECORD your own narration & share it with others - SELECT a scene with easy-to-use navigation - KEEP kids in the story with parental controls Designed for children ages 4-8 - Children's Technology Review Editor's Choice Award Winner! "This is one of those deceiving apps that will exceed expectations, delivering the entertainment goods each time." Kirkus Reviews "This will be a treasured app for many a truck loving kid!" - TeachersWithApps ---------------------- We'd Love To Hear From You! - Please share your thoughts in a review! Your experience matters to us. - Need tech support? Contact us at [email protected] - Say hello to us on FB! facebook.com/oceanhousemedia Official Chronicle Books LLC licensed App: www.chroniclebooks.com
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
TypeScript
React Navigation
react-native-reanimated
BUILD KIT DIFFICULTY
Starter
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.
