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
Period.App
Understand her cycle
$7.99 · In-app purchases
PRICE
$7.99
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's included16 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 Period.App: 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 add custom symptoms and categories.
Assumption to check: Limited customization options for tracking different symptoms
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social features to connect users.
Assumption to check: Lack of community features for user support
Validate with people who use this workflow before building.
Hypothesis 3
Add customizable reminders for periods and ovulation.
Assumption to check: No reminders for cycle events
Validate with people who use this workflow before building.
Hypothesis 4
Provide deeper analytics and tailored recommendations.
Assumption to check: Insufficient insights based on logged data
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
Understand her cycle. Show up better. Period. helps you understand your partner and/or daughter's menstrual cycle, predict what’s coming, and know exactly how to support her—every day. No more guessing. No more confusion. Just clear, daily insights that help you build a stronger relationship. WHAT YOU GET Daily Cycle Insights Get simple, easy-to-understand updates based on where she is in her cycle—so you always know what to expect. Phase-Based Guidance Learn how mood, energy, and emotions may shift throughout the cycle, and how to respond in a supportive way. Smart Predictions Anticipate upcoming phases, including period start, ovulation, and hormonal changes—before they happen. Relationship-Focused Tips Get actionable suggestions on what to say, what to avoid, and how to show up better in each phase. BUILT FOR REAL LIFE Period. is designed for partners who want to: Understand mood and behavior changes Communicate better Reduce conflict and confusion Strengthen emotional connection Whether you’re in a relationship, married, or navigating parenthood, Period. gives you the awareness you’ve been missing. STAY AHEAD WITH DAILY UPDATES Get ongoing insights so you’re never caught off guard. Know when to: Lean in Give space Offer support Plan ahead WHY IT WORKS Her cycle impacts more than just a few days—it affects the entire month. Period. helps you understand the full picture so you can show up with confidence. SUBSCRIPTION Period. offers a subscription for full access to all insights, predictions, and guidance. Monthly subscription 7-day free trial Cancel anytime PRIVATE & SECURE Your data is private and secure. We do not share personal information. START TODAY Download Period. and start showing up better—every day. Privacy Policy: https://app.periodbycycleaware.com/privacy Terms of Service: https://app.periodbycycleaware.com/terms
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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
@supabase/supabase-js
Victory
Formik
React Native Reanimated
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.
