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.
Your week-by-week pregnancy companion
Free
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Prego: Pregnancy Baby Tracker: map the core Medical workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor performance
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Your week-by-week pregnancy companion. Track your baby's growth, get personalized advice, and prepare for motherhood with confidence. Pregnancy is one of life's most beautiful journeys, and Prego is here to guide you every step of the way. From your first positive test to the moment you hold your baby, our all-in-one pregnancy tracker app makes the next 40 weeks easier, healthier, and more joyful. WHY MOMS LOVE PREGO • Accurate Due Date Calculator Calculate your due date in seconds based on your last menstrual period or conception date. Know exactly how far along you are, down to the day. • Baby Size by Fruit Watch your little one grow week by week with our adorable fruit comparisons. From a poppy seed to a watermelon, see your baby's amazing development at every stage. • Smart Pregnancy To-Do List Never miss an important milestone. Get personalized checklists for doctor appointments, prenatal vitamins, baby registry, hospital bag prep, nursery setup, and more. • Pregnancy-Safe Food Tracker Log your meals and know what's safe to eat. Get nutrition guidance tailored to each trimester to support you and your growing baby. • Prenatal Exercise Tracker Stay active safely with trimester-specific workouts. Track your steps, yoga sessions, and prenatal exercises designed for expecting moms. • Personalized Daily Advice Receive expert tips and insights customized to your data, symptoms, and current pregnancy week. No more generic advice. Get guidance that fits YOUR journey. • Pregnancy Journal & Symptom Log Document your bump growth, cravings, mood, sleep, and symptoms. Look back on your beautiful memories anytime. EVERYTHING EXPECTING MOMS NEED • Week-by-week pregnancy updates • Daily fetal development insights • Baby kick counter • Contraction timer • Weight gain tracker • Baby items checklist • Doctor appointment reminders • First, second & third trimester guides SUBSCRIPTION DETAILS Prego is a subscription app. A subscription is required to keep using the app, including: • All pregnancy tracking tools • Personalized weekly content • Expert-curated tips and advice • All future updates included Subscription length and pricing are shown in the app before purchase. Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your Apple Account Settings after purchase. Any unused portion of a free trial is forfeited when you purchase a subscription. Terms of Service - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ JOIN THOUSANDS OF HAPPY MOMS Whether you're a first-time mom or expecting again, Prego turns pregnancy tracking into a beautiful, personalized experience. Download now!
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
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.