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.
Waist to Hip Ratio Calculator is health calculator to find your WHR number which can help you determine which body shape category or health conditions you fit into.
$2.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Waist to Hip Ratio Calc: 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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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
Assumption to check: Limited functionality beyond calculation.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of customization options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing options.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Single measurement type.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Waist to Hip Ratio Calculator is health calculator to find your WHR number which can help you determine which body shape category or health conditions you fit into. Features: • Instant calculation • Save results to history with simple graph visualization • Built-in formula reference for easy understanding • Supports both metric and imperial units • Lightweight and optimized for everyday use Waist-hip ratio or Waist-to-hip ratio (WHR) is the ratio of the circumference of the waist to that of the hips. It is calculated by measuring the smallest circumference of the natural waist, usually just above the belly button, and dividing by the hip circumference at its widest part of the buttocks or hip. The ratio is applied both to women and men. For example, a person with a 32″ waist and 37″ hips has a waist-hip ratio of about 0.86. It's not only the amount of body fat you have, but also where in your body the fat is stored that impacts on your health. Adults who store most of their body fat around their waists have an increased risk of high blood pressure, type 2 diabetes, heart disease and stroke compared with those who have the same amount of body fat stored around their hips and thighs. Measuring your waist-to-hip ratio is an easy way to see how much weight you are carrying around your abdomen as opposed to around your hips. Measurement: - Waist measurement with stomach relaxed, measure waist at its narrowest point which normally at your navel or belly-button. - Hip measurement during standing, measure hips at widest point or around the bony prominence. WHR for Male 0.90 or lower - normal weight 0.90 to 0.99 - over-weight 1.0 or higher - obese WHR for Female 0.80 or lower - normal weight 0.81 to 0.84 - over-weight 0.85 or higher - obese The WHR has been used as an indicator or measure of health, and as a risk factor for developing serious health conditions. WHR is used as a measurement of obesity, which in turn is a possible indicator of other more serious health conditions. The WHO states that abdominal obesity is defined as a waist–hip ratio above 0.90 for males and above 0.85 for females, or a body mass index (BMI) above 30.0. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) states that "total cholesterol levels are usually higher in persons with predominant abdominal obesity, defined as a waist-to-hip circumference ratio of ≥ 0.8 for women and ≥ 1.0 for men. Waist to Hip Ratio Calculator is for informational or educational purposes only, and does not substitute professional medical advice or consultations with healthcare professionals. Please seek a doctor’s advice in addition to using this app and before making any medical decisions. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.