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
Blood Pressure Log Feeltracker
Feeltracker: Rated 4.8 with 20,500+ ratings • 60,000+ users • 1M+ downloads • 96% satisfaction
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
3,163 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 Blood Pressure Log Feeltracker: 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 interactive charts for better data visualization.
Assumption to check: Users find it hard to visualize long-term data trends
Validate with people who use this workflow before building.
Hypothesis 2
Add gamification elements to encourage regular logging.
Assumption to check: The app lacks motivation features
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription management and provide clear information on tiers.
Assumption to check: Users report difficulty managing subscriptions
Validate with people who use this workflow before building.
Hypothesis 4
Optimize data storage and loading for faster access.
Assumption to check: Performance issues with large data sets
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
Feeltracker: Rated 4.8 with 20,500+ ratings • 60,000+ users • 1M+ downloads • 96% satisfaction Simply point your camera at your blood pressure monitor and let AI instantly capture and analyze your readings. Feeltracker BP combines cutting-edge scanning technology with AI-powered health insights to make cardiovascular tracking effortless—and help you understand what your numbers really mean. Whether you're managing hypertension or maintaining heart health, get instant clarity you can trust. COMPREHENSIVE HEART HEALTH TRACKING: • Log systolic, diastolic, and pulse readings with ease • Scan blood pressure monitors with your camera for instant, accurate entry • AI-powered scanning technology works with Omron and other BP monitor brands • Track multiple daily readings for accurate averages • Categorize readings by arm, position, and time of day • Monitor medication effects on your blood pressure • Add notes about activities, stress, or symptoms • AI chat, voice feedback, and pattern insights for your heart health YOUR PRIVACY, PROTECTED: • No account required—start tracking immediately • Face ID/Touch ID protection for your health data • Automatic iCloud sync keeps readings secure across devices • Export reports in PDF, CSV, Excel, or JSON formats DESIGNED FOR DAILY MONITORING: • Beautiful Liquid Glass design • Eye-friendly Dark Mode for comfortable tracking any time of day • Color-coded readings show normal, elevated, or high ranges • Quick-entry widgets for logging from home screen • Smart reminders for consistent monitoring schedule • Full integration with Apple Health UNDERSTAND YOUR HEART HEALTH: • Detailed trends reveal blood pressure patterns • Interactive charts—tap any point to view detailed readings instantly • Weekly and monthly averages for doctor visits • Identify triggers that affect your readings • Track improvements from lifestyle changes • Generate professional reports for healthcare providers AI-POWERED FEATURES: • Ask a Question: Instant answers about your blood pressure data • Chat: Interactive cardiovascular health conversations • Voice Summary: Audio summaries of your blood pressure trends • Pattern Detective: Discover hidden correlations affecting your readings • Goal Assistant: Personalized blood pressure goals • Doctor Summary: Professional summaries for doctor visits • Tailored Health Report: Comprehensive personal health document • Deep Research Report: In-depth cardiovascular pattern analysis • Sick Note: Documentation based on your health records • Personalized Quiz: Test your knowledge about blood pressure health • Make Me Laugh & Calm Me Down: Humor and guided breathing FREE WITH PREMIUM OPTIONS: • All core tracking features completely free • Upgrade to Premium for extended AI features and 10x daily AI quota • Affordable pricing for lifelong heart health management IMPORTANT HEALTH DISCLAIMER: This app is for personal tracking and informational purposes only. AI insights and recommendations do not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making health decisions. In a medical emergency, contact emergency services immediately. Privacy Policy: https://feeltracker.com/privacy.html Terms of Use: https://feeltracker.com/terms.html
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.
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BUILD KIT DIFFICULTY
Advanced
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.
