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
Maybe Baby™ Fertility Tracker
MUST HAVE APP #1 FOR EVERY WOMAN!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
1,033 ratings · Top 15%
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's included13 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 Maybe Baby™ Fertility 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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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
Implement smarter algorithms to predict cycles based on user data.
Assumption to check: Users report difficulty in tracking irregular cycles.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the subscription model and make it clearer.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the insights engine to provide personalized health tips.
Assumption to check: Limited insights based on user data.
Validate with people who use this workflow before building.
Hypothesis 4
Build an in-app support feature for user queries.
Assumption to check: Poor customer support response times.
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
MUST HAVE APP #1 FOR EVERY WOMAN! -it shows if you could get pregnant today -if it would be a boy or a girl and -when your next period & ovulation. -it supports the following languages: English (US), English (UK), French, German, Italian, Japanese, Russian and Spanish ~more than 4,500,000 people use it already~ ~Constant FREE updates~ Dedicated to My Wife and my Baby With Love. This App Helped my Wife and Me to Conceive our Baby on October 2009 :) I Hope it Will Help You Too. For more information or support, please visit http://www.bazilsoft.com Best Cool & Funny Games For Girls & Kids! Touch Top Fun! _____________________________________________ ** DON'T MISS OUR OTHER EXCITING APPS! ** Abby Ball™, Attack Balls™, Bubble Burst™, Alison Baby Monitor, Take Pills Pill Reminder GIFT THIS APP: Click the “Buy App” arrow on the iTunes® App Store Copyright 2024 Bazilsoft
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
Supabase
Zustand
react-native-chart-kit
@react-navigation/native
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.
