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
Baby Gender Predictor-boy girl
- The most valuable app for pregnancy mothers to find out conception date, delivery date and baby gender
$1.99 · In-app purchases
PRICE
$1.99
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.
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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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Baby Gender Predictor-boy girl: 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
Use a more scientifically-backed algorithm for predicting gender.
Assumption to check: Inaccurate predictions based on arbitrary inputs
Validate with people who use this workflow before building.
Hypothesis 2
Add features such as baby name suggestions or parenting tips.
Assumption to check: Limited functionality beyond predictions
Validate with people who use this workflow before building.
Hypothesis 3
Implement user accounts and social sharing for predictions.
Assumption to check: No user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Introduce dynamic pricing and promotions for premium features.
Assumption to check: Static pricing model
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
- The most valuable app for pregnancy mothers to find out conception date, delivery date and baby gender. Further more you will have a baby gender prediction based on your age, if you are planing to have a baby in the future. This is the simplest app and the one you are looking to calculate and find the conception date, delivery date and the gender of your baby. Recommends for all the mothers-to-be. This app calculates estimated conception date, estimated due date and estimated fetal age. You will be very happy to find out these days. Also we have add a most awaited feature which you were looking for. Now this app can predict the gender of your unborn baby. This app will show you whether you are going to have a baby boy or baby girl. This prediction is based on the ancient Chinese prediction methodology which is known for it's accuracy. This app provides details of * conception date, * estimated due date, * estimated fetal age, * baby gender (baby girl or baby boy)
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-native-picker
react-native-async-storage
expo-router
Zustand
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.
