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
My Baby Charts
Track your baby's growth with confidence using WHO and CDC growth charts.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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'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 My Baby Charts: map the core Health & Fitness 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 features like nutrition tracking and reminders.
Assumption to check: Limited features compared to comprehensive health apps
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate interactive charts and progress animations.
Assumption to check: Data visualization may not be engaging
Validate with people who use this workflow before building.
Hypothesis 3
Create a guided onboarding experience to explain features.
Assumption to check: User onboarding may be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Clearly outline premium features and benefits in the app.
Assumption to check: In-app purchases not clearly defined
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
Track your baby's growth with confidence using WHO and CDC growth charts. MyBabyCharts helps parents monitor their baby's complete growth development against World Health Organization (WHO) and CDC growth percentiles. Beautiful visualizations make it easy to see how your baby is growing over time. FEATURES: • Track multiple babies with individual profiles • Record weight, length, head circumference, and BMI • Visualize growth against WHO and CDC percentile curves • Support for both metric and imperial units • Beautiful Swift Charts for data visualization • iCloud sync across all your devices • Available in 11 languages • Dark mode support • Privacy-focused - your data stays on your devices GROWTH CHARTS: • Weight-for-age charts • Length/Height-for-age charts • Weight-for-length charts • BMI-for-age charts • Head circumference-for-age charts • WHO and CDC percentile curves (3rd, 15th, 50th, 85th, 97th) GROWTH STANDARDS: Choose between WHO 2006 Child Growth Standards and CDC 2000 Growth Charts to match your pediatrician's recommendations. WHO standards are ideal for breastfed infants, while CDC charts provide US population reference data. PERFECT FOR: Parents who want to track their baby's growth and development with professional medical standards. Keep all your baby's measurements in one place and see their growth trends at a glance. CLOUD SYNC: Seamlessly sync your data across iPhone, iPad, and Mac with iCloud. Your data is always up-to-date and available wherever you need it. MULTILINGUAL: Available in English, German, Dutch, French, Italian, Spanish, Portuguese, Japanese, and Chinese (Simplified & Traditional). ACCESSIBILITY: Designed with accessibility in mind, MyBabyCharts works great with VoiceOver, Dynamic Type, and other assistive technologies. PRIVACY: Your data is yours. All information stays on your devices and iCloud account. We never collect, sell, or share your personal data. Download MyBabyCharts today and start tracking your baby's growth journey!
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
axios
victory-native
react-native-paper
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.
