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
Migraine Buddy: Track Headache
Curious about why 4 million migraine sufferers trust Migraine Buddy?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
41,746 ratings · Top 5%
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 included17 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 Migraine Buddy: Track Headache: 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 a more detailed trigger logging system with suggestions.
Assumption to check: Users report difficulty tracking triggers accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance insights with more visualizations and detailed reports.
Assumption to check: Limited insights and analytics provided.
Validate with people who use this workflow before building.
Hypothesis 3
Create a transparent subscription page with clear benefits.
Assumption to check: Subscription options are not clearly communicated.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI by reducing clutter and improving navigation.
Assumption to check: Some users find the interface cluttered.
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
Curious about why 4 million migraine sufferers trust Migraine Buddy? Migraine Buddy is your ultimate companion to: - Pinpoint and decipher patterns quicker than ever before - Maximize your medical consultations with comprehensive reports crafted by top specialists - Share experiences, gain insights, and even chat with fellow users in our thriving community - [Premium] Turn your tracked data into personalized insights that help you stay one step ahead, and get access to an action plan you can adjust to your routine. - [Premium] Personalized coaching plans developed by experts to ensure progress at your pace Discover Migraine Buddy's Features: Customizable Attack Recording How does it assist you? Glean insights from shared triggers, symptoms, medications, and relief methods. Customize the tool to record your unique migraine attributes. Exports for Doctors - Diary export: Comprehensive reports you can share with your healthcare professional to support their clinical assessment of your headache history. - MIR export: Share structured reports with your neurologist to support your discussions about migraine management. AI features - [Premium] Attack Duration: Based on your recorded attacks, see how long your current attack may last. - Smart Symptoms & Trigger Suggestions: Get suggestions while recording your attack to help you identify relevant symptoms and potential triggers. - 7 days Weather Forecast: Pressure and temperature fluctuations can trigger your migraine. While you can't control the weather, you can strategize. Stay alert to weather changes, such as variations in atmospheric pressure, which some users associate with their migraine attacks. Migraine Insights & News In-app updates with the latest information and research on migraines. Stay informed about the latest developments in the migraine world. Participate in questionnaires and gain insights from other users' experiences. An Active Community Join our vibrant community of 3.5 million users who are there to offer support, share experiences, and provide advice. Automatic Sleep Recording Uncover potential links between your sleep patterns and the onset of migraines. Why is this crucial? Migraines can feel isolating. Receiving support from those who understand and sharing unique experiences can provide new perspectives on your journey. Want more? Upgrade to MBplus, Migraine Buddy's premium suite. Take your migraine management to the next level with the world's most advanced tools at your fingertips. With MBplus, gain access to: Advanced Features Detailed Reports Actionable Programs *Migraine Buddy optionally integrates with the Health app for a holistic health view. Disclaimer: Migraine Buddy is a self-management tool and should not replace professional medical advice; always consult a healthcare provider for diagnosis and treatment. Migraine Buddy Terms of Use: https://migrainebuddy.com/terms-of-use
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
Zustand
@react-navigation/native
react-native-chart-kit
expo-linear-gradient
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.
