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
Monthly Cycles
Track, monitor, and understand your menstrual cycle with an app that truly gets you
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
70 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.
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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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.
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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 Monthly Cycles: map the core Health & Fitness 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
Allow users to create custom symptoms and tracking categories.
Assumption to check: Limited customization options for tracking different symptoms.
Validate with people who use this workflow before building.
Hypothesis 2
Implement health data integration for better insights.
Assumption to check: No integration with health data from Apple Health or Google Fit.
Validate with people who use this workflow before building.
Hypothesis 3
Provide visual charts and trends based on the user's data.
Assumption to check: Limited analytics and insights on cycle patterns.
Validate with people who use this workflow before building.
Hypothesis 4
Offer clearer explanations of premium benefits and a better trial experience.
Assumption to check: In-app purchase for premium features can be confusing.
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
Track, monitor, and understand your menstrual cycle with an app that truly gets you. Monthly Cycles was lovingly designed to be both fun and beautiful. See fertile days and variations in your cycle at a glance. It even has fun features like the most auspicious days for conceiving a boy or a girl! Monthly Cycles makes it possible to plan the next chapter in your life, or avoid unwanted pregnancy, putting you back in control. BEAUTIFUL INTERFACE – Calendar view shows your cycle at a glance – Color-coded icons for special days – Diary to keep track of symptoms, flow and more TAKE CONTROL OF YOUR CYCLE – Period calculations take account of your personal fluctuations – Detailed graphs to watch for changes – Instantly see your fertile days to help manage pregnancy – Pregnancy mode to count down the days ALL YOUR INFO – Track your weight and temperature changes – Medical reports for temperature, acne, cramps, headaches, nausea, tenderness – Logged and ready for you, or your doctor – Export data quickly via email – Sync your data with Apple Health App QUESTIONS? We want you to make the most of Monthly Cycles. Email our support team with questions and suggestions at: [email protected]
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 Navigation
React Native Paper
Async Storage
Expo Calendar
Redux
BUILD KIT DIFFICULTY
Intermediate
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.
