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
Body Stats: Body Tracking
Transform your approach to body composition tracking with Body Stats – the comprehensive measurement app designed for fitness enthusiasts, athletes, and health-conscious individuals.
$1.99 · In-app purchases
PRICE
$1.99
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.
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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Combine features and design from your favorite apps.
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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 included17 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 Body Stats: Body Tracking: 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
Integrate social features for users to share achievements and motivate each other.
Assumption to check: Lack of community features such as sharing progress with friends
Validate with people who use this workflow before building.
Hypothesis 2
Provide more chart types and insights for better tracking.
Assumption to check: Limited data visualization options
Validate with people who use this workflow before building.
Hypothesis 3
Include tailored workout plans based on user goals.
Assumption to check: No personalized workout plans or suggestions
Validate with people who use this workflow before building.
Hypothesis 4
Implement modern UI/UX design elements for a more engaging experience.
Assumption to check: Basic design can feel outdated
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
Transform your approach to body composition tracking with Body Stats – the comprehensive measurement app designed for fitness enthusiasts, athletes, and health-conscious individuals. Whether you're pursuing weight loss, muscle gain, or maintaining optimal health, BodyStats provides the tools you need to track your progress with scientific accuracy. Our intuitive interface makes it effortless to record measurements and automatically calculate essential health metrics. Key Features: Smart Measurement Tracking • Log standard measurements: weight, height, body fat, waist, chest, arms, and more • Automatic calculation and log of measurements when logging measurement that meet the requirement for another • Create custom measurements for any body part or metric you want to track • Automatic unit conversion between US and metric systems • Historical data visualization to monitor trends over time Advanced Health Calculations • BMI calculation with real-time updates • Body fat percentage using proven formula (US Navy) • Lean body mass and fat mass calculations • Automatic recalculation when measurements change Seamless HealthKit Integration • Import existing health data automatically • Sync measurements with Apple Health • Maintain consistency across all your health apps Professional-Grade Features • Multiple body fat calculation methods for enhanced accuracy • Support for both male and female body composition formulas • Comprehensive measurement history with detailed tracking • Clean, modern interface optimized for daily use Perfect For: • Fitness enthusiasts tracking body recomposition • Athletes monitoring performance metrics • Health-conscious individuals pursuing wellness goals • Anyone seeking precise body measurement tracking Why Choose BodyStats? Built by fitness professionals who understand that accurate tracking is the foundation of progress. BodyStats eliminates guesswork with scientifically-backed calculations and provides the detailed insights you need to make informed decisions about your health and fitness journey. Stop relying on unreliable methods or complicated spreadsheets. BodyStats delivers professional-quality body composition tracking in an app that's as powerful as it is easy to use. Download BodyStats today and start tracking your transformation with confidence.
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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 Native
Expo
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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.
