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
The Wheels On The Bus - Sing Along Nursery Rhyme
**************FREE FOR LIMITED TIME ONLY*******************( REGULAR PRICE 2.99$)!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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's included17 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 The Wheels On The Bus - Sing Along Nursery Rhyme: map the core Entertainment 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
Offer a wider variety of songs and rhymes.
Assumption to check: Limited song selection
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline playback for downloaded songs.
Assumption to check: No offline access
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with better animations and graphics.
Assumption to check: Basic user interface
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share their favorite songs or moments.
Assumption to check: No social sharing 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
**************FREE FOR LIMITED TIME ONLY*******************( REGULAR PRICE 2.99$)! **************FREE FOR LIMITED TIME ONLY******************* ( REGULAR PRICE 2.99$)! -> 4 fabulous games including the full interactive sing along "The wheels on the bus" -> Adorable HD graphics and sounds -> Top selling education app worldwide The perfect game for little kids that love to sing! Wheels on the bus is a beautiful and fun, sing along and interactive counting game bundle based on the popular rhyme we all know and love. Toddlers, preschool and kindergarten kids will love this app- All in one bundle fun for 2-6 year old kids. Come and enjoy the classic song with your little ones A highly engaging and beautiful graphic games pack that will keep your kids entertained for hours. It is the perfect game for little kids that love to sing! This so cute, HD graphics, activity center pack includes 4 different fun learning activities to play with: ** SING ALONG with wheels on the bus – The classic song comes alive with beautiful animation and funny interactions. Tap on different items and interact with the song ** JOIN THE DOTS with wheels on the bus – Join dots, explore and learn to count with amazing illustrations to color later on ** JIGSAW PUZZLES with wheels on the bus - High quality, colorful and fabulous jigsaw puzzles to help practice fine motor skills and shape recognition. ** MEMORY MATCHING GAME wheels on the bus -Match the pairs to improve visual memory. Complete all pairs to move to the next level. Wheels on the bus activity bundle for toddlers, preschool and kindergarten kids is a colorful, fun educational experience. Easy for little fingers to play. **************************************** Privacy disclosure: • Does not collect or share any location and/or personal data • Does not contain any ads • Does not contain In-App Purchases • Does not contain Social Network Integration • Does not contain web browser links • The app contains “more apps” external links on a separate page accessible through a "press and hold" button. ********** ## Contact us! ## NOTE: Please don't include bug reports in your app reviews. We can't respond to you directly, so it can be difficult for us to offer help or properly debug the situation. Have questions, suggestions, or concerns? Please email us at [email protected] and we’ll be happy to help!
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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
Zustand
React Navigation
expo-av
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.
