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
iPeriod Period Tracker +
Take Control of Your Health with iPeriod® – TRUSTED BY MILLIONS FOR 17 YEARS
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
2,694 ratings · Top 30%
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 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 iPeriod Period Tracker +: 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
Implement reminders and an easy logging interface.
Assumption to check: Users find it difficult to log symptoms consistently.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more flexible tracking options and user-defined settings.
Assumption to check: Limited customization for cycle tracking.
Validate with people who use this workflow before building.
Hypothesis 3
Add social features for users to connect and share experiences.
Assumption to check: Lack of community engagement features.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance notification settings for better user control.
Assumption to check: Inconsistent notifications for period reminders.
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
Take Control of Your Health with iPeriod® – TRUSTED BY MILLIONS FOR 17 YEARS "A must-have Personal Assistant" – GLO.MSN.COM "Top iPhone App for Busy Women" – FORBES "Simple yet ingenious" – POPULAR SCIENCE "What's Hot" – APP STORE Classy. Elegant. Discreet. We never share your data and keep period tracking simple, uncluttered, and stress-free. Celebrating 17 Years as a top Healthcare & Fitness app! iPeriod® is your ALL-IN-ONE FERTILITY, OVULATION, AND PERIOD TRACKER designed to empower women at every stage – whether you're tracking for PREGNANCY PLANNING, managing IRREGULAR PERIODS, or simply staying informed. Why Choose iPeriod? • TRUSTED for 17 years with millions of downloads • Track more than 80+ SYMPTOMS for personalized insights • More CUSTOMIZATION than any other tracker • 100% PRIVATE – no data sharing, no ads • BEAUTIFUL, INTUITIVE VISUAL CALENDAR for easy cycle tracking • Automatic SYNCING ACROSS iOS DEVICES with Apple sign-in Features You'll Love: PRIVACY YOU CAN TRUST • Your data is NEVER SHARED – your health is your business. • Secure with PASSWORD PROTECTION and automatic cloud backup. COMPREHENSIVE TRACKING & INSIGHTS • Track your PERIODS, OVULATION, FERTILITY, MOODS, WEIGHT, and more! • Advanced predictions for PERIODS AND FERTILE WINDOWS. • Export and print reports for DOCTOR APPOINTMENTS. SMART NOTIFICATIONS & REMINDERS • Custom reminders for BREAST EXAMS, CYCLE ALERTS, AND MEDICATIONS. • Receive alerts for upcoming periods and fertile windows – great for TRIP PLANNING! PERSONALIZED EXPERIENCE • Track what matters most to you with EXTENSIVE CUSTOMIZATION OPTIONS. • View GRAPHS to spot trends and patterns. • Discreet app icon "iP" for privacy. APPLE HEALTH INTEGRATION • Sync STEPS, CALORIES, WEIGHT, and menstrual data for a complete wellness view. COMMUNITY & SUPPORT • Connect with others through our COMMUNITY FORUMS and share experiences. -------------------------------------------------------------------------------------- iPeriod SUBSCRIPTIONS At iPeriod, your privacy isn't just important—it's personal. Since we created iPeriod in 2008, our small family-owned business has been dedicated to empowering women with essential health tracking services while keeping your data completely confidential. We've never sold or shared your information, and we never will. By subscribing, you're not only helping us maintain our servers but also supporting our mission to promote women's health and well-being. Please consider supporting us—your subscription truly makes a difference. Support our SMALL FAMILY-RUN BUSINESS and gain exclusive benefits: • UNLIMITED SYMPTOM TRACKING for deeper health insights • DETAILED FERTILITY & BBT ANALYSIS • AD-FREE EXPERIENCE • UNLIMITED PDF REPORTS for easy sharing Choose Your Plan: • 1-MONTH PREMIUM SUBSCRIPTION • 12-MONTH PREMIUM SUBSCRIPTION (BEST VALUE!) Privacy Policy and End User License Agreement: https://iperiod.net/PrivacyPolicyiPeriod.html https://iperiod.net/iPeriodEULA.html JOIN MILLIONS of women who trust iPeriod® for better health tracking. Download now and take charge of your cycle today!
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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
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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.
