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
Trains - Byron Barton
Call "All Aboard" as you interact with many different types of trains in this exciting book app for new readers! Explore pictures, learn new vocabulary, and personalize the story with your own narration
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
32 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 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 Trains - Byron Barton: 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
Incorporate animations or mini-games related to the story.
Assumption to check: Limited interactivity for children
Validate with people who use this workflow before building.
Hypothesis 2
Add a narration option for each page.
Assumption to check: No read-aloud feature
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize reading preferences (font size, background color).
Assumption to check: Lack of personalized content
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer guidance on what content is purchasable.
Assumption to check: In-app purchase confusion
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
Call "All Aboard" as you interact with many different types of trains in this exciting book app for new readers! Explore pictures, learn new vocabulary, and personalize the story with your own narration. Complete with moveable objects and brightly colored illustrations, learning is fun with Byron Barton's "Trains"! Explore the Story: - ENCOURAGE literacy skills with highlighted narration - LEARN new vocabulary with tappable words and pictures - INTERACT with animations & movable objects on every page! - RECORD your own narration & share it with others - KEEP kids in the story with parental controls Designed for children ages 2-5 ------------------------------------------------------------------------ The Reviews Are In: - Editor's Choice Award - Children's Technology Review - Selected in "Apps for Holiday Travel" - Lil Sugar - Selected in "5 Apps Your Kids will Love" - Mashable ------------------------------------------------------------------------ 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 HarperCollins licensed app: www.harpercollinschildrens.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
React Navigation
Redux
Expo-Image
React Native Sound
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.
