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
Infant Zoo: Sounds For Baby
WIth simple, high-contrast illustrations, engaging animal sounds, animations, and stimulating 'bubbles', Infant Zoo is designed specifically for newborns and young babies
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
4,188 ratings · Top 30%
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.
Build your own version
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 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 Infant Zoo: Sounds For Baby: map the core Education 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 more sounds in the free tier or as part of a subscription.
Assumption to check: Limited animal sounds available in the free version
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided tutorial for first-time users.
Assumption to check: Navigation can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate games or quizzes related to animal sounds.
Assumption to check: Lack of interactive elements for engagement
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
WIth simple, high-contrast illustrations, engaging animal sounds, animations, and stimulating 'bubbles', Infant Zoo is designed specifically for newborns and young babies. Infant stimulation can help improve your baby's attention span, memory and curiosity, while research has shown that the secret to infant visual stimulation lies in high-contrast colors. Use Infant Zoo and its high-contrast visuals to help calm and soothe your baby as well as increase concentration skills, enhance natural curiosity, and stimulate the creation of brain cell connections. Features: • 16 high-contrast animals with sound and animation • 2 modes of play - 'watch' mode for newborns and 'play' mode for older babies • A 'watch mode' that allows your infant watch Infant Zoo like a movie • A 'play mode' that encourages interaction for when your infant is able to grasp • 'Bubbles' when you shake the iPhone/iPad • Vibrations when the animal animates • Support for Retina iPad and iPhone Disclosures: • This app DOES NOT feature in-app purchases • This app DOES NOT contain any 3rd party advertising • This app DOES contain an external link back to our other age appropriate apps. • This app DOES NOT report any personally identifiable user data
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
Zustand
React Navigation
expo-av
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.
