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
Pregnancy Baby Tracker - WTE
Get the #1 Pregnancy & Baby Tracker App to follow your pregnancy week-by-week and log your baby’s day.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
379,251 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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.
JavaScript is required to complete mailbox verification.
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 Pregnancy Baby Tracker - WTE: map the core Medical workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Include a tailored experience based on the user's due date and preferences.
Assumption to check: Lack of personalized content for different pregnancy stages.
Validate with people who use this workflow before building.
Hypothesis 2
Add interactive features like polls, Q&A sessions, and live chats.
Assumption to check: Limited community engagement features.
Validate with people who use this workflow before building.
Hypothesis 3
Clarify subscription benefits and provide a better trial experience.
Assumption to check: In-app purchase confusion around premium content.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a step-by-step guide for first-time users.
Assumption to check: Overwhelming amount of information at once.
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
Get the #1 Pregnancy & Baby Tracker App to follow your pregnancy week-by-week and log your baby’s day. What to Expect is the world’s best-known all-in-one pregnancy and baby tracker app, trusted by more than 15 million parents. Our free app features daily pregnancy tracking and tips, a newborn and baby log, expert articles to support every stage, and connection with other parents in our Community. Pregnancy Tracker * 3D pregnancy videos showing weekly baby development from conception to birth * Themed baby size comparisons featuring fruits, sports, snacks and more * Week-by-week pregnancy tracker showing baby development, pregnancy symptoms and daily tips * Log pregnancy symptoms, weight, kick counts, medications and memories * Expert-reviewed articles for every stage of pregnancy * My Registry tool to help you choose the best products and registry * Contraction counter to track the frequency and duration of contractions * Twin mode to represent your unique pregnancy journey Newborn & Baby Log * Free Baby Tracker tool to time and log baby’s feedings, diaper changes, sleep, pump sessions, and more * Month-by-month and milestone tracker for each step of your baby’s life, from the newborn to the toddler stage, including key first year milestones * Daily tips tailored to your baby’s age, stage, your postpartum recovery, and your parenting journey * Record your postpartum symptoms and medications * Medically reviewed articles and info about baby’s health, doctor’s appointments and vaccines Family Planning Tools * Ovulation Calculator and Calendar pinpoints your most fertile days * Due Date Calculator estimates your baby’s due date * My Journal tool helps you document pregnancy symptoms, memories and notes About Us All content on the What to Expect app is accurate, up-to-date, and reviewed by medical experts, including the What to Expect Medical Review Board. It aligns with current health guidelines and Heidi Murkoff’s trusted books. Medical information comes from expert sources like ACOG, AAP, and peer-reviewed journals to ensure reliability and credibility. For more about What to Expect's medical review and editorial policy, visit: https://www.whattoexpect.com/medical-review/ Do not sell my info: https://dsar.whattoexpect.com/ Let’s connect on social media: * Instagram: @whattoexpect * X: @WhatToExpect * Facebook: facebook.com/whattoexpect * Pinterest: pinterest.com/whattoexpect * TikTok: @whattoexpect
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
@supabase/supabase-js
BUILD KIT DIFFICULTY
Expert
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.
