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.
40+ Health and Fitness Calculators at Your Fingertips
$0.99 · 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 FitCalcPro+: 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 food database for calorie tracking
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent design elements
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of customization options for workouts
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.
40+ Health and Fitness Calculators at Your Fingertips -- FitCalcPro+ redefines health and fitness tracking with an extensive variety of 40+ calculators to cater to every aspect of your health journey. Whether you're a fitness enthusiast striving for peak performance, a health-conscious individual focusing on wellness, or a beginner embarking on a transformative lifestyle, our comprehensive collection of calculators ensures you have the precise tools to achieve your goals efficiently. -- All the Calculators You’ll Ever Need Body Metrics Gain essential insights into your body composition and health status with powerful tools designed to provide accurate and actionable data: -- BMI (Body Mass Index): Quickly calculate your weight-to-height ratio and assess your overall health. BMR (Basal Metabolic Rate): Understand the calories your body needs at rest to maintain vital functions. TDEE (Total Daily Energy Expenditure): Get a precise estimate of your daily calorie requirements based on your activity level. Body Fat Percentage: Measure your body fat for a clearer picture of your physical fitness. Waist-to-Hip Ratio: Evaluate your fat distribution to identify health risks. Lean Body Mass: Determine your muscle mass and optimize your fitness routine. Fitness Goals Stay on track to achieve your health and fitness aspirations with goal-oriented calculators: -- Calorie Deficit Calculator: Plan your weight loss journey with precise calorie targets. Weight Loss Progress Tracker: Visualize and celebrate every step of your transformation. Macro Nutrient Splitter: Customize your macronutrient intake for diets like Keto, Paleo, Vegan, and more. Protein Intake Estimator: Calculate the exact protein your body needs to build and repair muscle. Performance Tracking Monitor your physical performance and optimize your fitness routine with these advanced tools: -- VO2 Max Calculator: Measure your cardiovascular fitness and aerobic endurance. Maximum Heart Rate: Find your optimal training zones for heart-healthy workouts. Calories Burned Per Activity: Get detailed calorie data for running, yoga, swimming, and more. Specialized Health Tools Designed for unique life stages and needs, these tools go beyond the basics: -- Pregnancy Calorie Needs: Track the additional nutrients required during each trimester. Ideal Body Weight: Discover the ideal weight for your body type and height. Nutritional Insights Improve your diet with tools that focus on nutritional well-being: -- Hydration Needs Calculator: Stay hydrated with personalized daily water intake recommendations. Daily Fiber Intake: Ensure you meet your dietary fiber requirements for digestive health. Glycemic Load Calculator: Monitor the impact of carbohydrates on your blood sugar levels. With FitCalcPro+, you’ll gain confidence in your health decisions and have the insights to refine your fitness strategy anytime, anywhere. -- Why 40+ Calculators Matter FitCalcPro+ offers more than just tools—it provides an entire ecosystem for smarter, data-driven fitness. Here’s why this variety is a game-changer for your health journey: -- Set Realistic and Achievable Goals: Plan for weight loss, muscle gain, or maintenance with reliable, data-backed guidance. Simplify Complex Metrics: No more guesswork—calculate health metrics with intuitive tools that provide instant clarity. Discover Tailored Recommendations: Receive personalized insights that adapt to your body type, activity level, and goals. Stay on Track: Use detailed calculators to assess progress and ensure you’re moving in the right direction. FitCalcPro+ is designed to empower you to make smarter decisions with precision and convenience. From tracking daily meals to managing your long-term fitness journey, our calculators are indispensable companions for every health goal. -- Ready to unlock your full potential? Download FitCalcPro+ today and discover the ultimate suite of health and fitness calculators for better living!
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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.