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
Beby – Baby Gender Predictor
Predict or plan your baby’s gender using ancient calendar traditions!
$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.
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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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 included14 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 Beby – Baby Gender Predictor: map the core Lifestyle 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
Introduce community features or social sharing to enhance user interaction.
Assumption to check: Limited engagement after predictions are made
Validate with people who use this workflow before building.
Hypothesis 2
Add informative articles or videos related to baby gender prediction.
Assumption to check: No educational content about gender prediction
Validate with people who use this workflow before building.
Hypothesis 3
Implement a freemium model with additional features for paid users.
Assumption to check: High price for a simple app
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their profiles and preferences.
Assumption to check: Lack of personalization options
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
Predict or plan your baby’s gender using ancient calendar traditions! Beby is a fun, beautifully designed app that lets you explore baby gender predictions and planning using the Chinese and Mayan calendars. Whether you’re already expecting or just planning ahead, Beby makes the experience simple, playful, and easy to understand. With Beby, you can: • Predict baby gender using mom’s age and conception month • Plan the best conception month for a desired gender • Compare results from Chinese and Mayan calendar traditions • Enjoy a clean, intuitive design in English and Spanish • Keep it light and fun—results are just for entertainment (50/50 odds!) Everything is wrapped in a cute, easy-to-use interface that makes exploring these traditions enjoyable and stress-free. Disclaimer: Beby is intended for entertainment purposes only. Gender predictions based on ancient calendars are not scientifically proven.
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
TypeScript
Axios
React Navigation
@react-native-async-storage/async-storage
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.
