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
MyFitnessPal: Calorie Counter
Achieve your nutrition, calorie, macro & fitness goals with MyFitnessPal – the AI-powered food & fitness tracker with everything you need
Free · In-app purchases
OVERALL US RANK
#60
Grossing · all categories
REVENUE (Est)
$370K/mo
$208K - $531K
RATING
★ 4.7
2,357,986 ratings · Top 15%
Evidence scope: #60 is the current overall US Grossing chart position. 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
Make this idea yours
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's included19 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 MyFitnessPal: Calorie Counter: 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
Implement barcode scanning for quick food logging.
Assumption to check: Users find it tedious to log every single meal.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create and share custom food entries.
Assumption to check: Calorie counts can be inaccurate or inconsistent.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify community navigation and highlight trending posts.
Assumption to check: Social features might feel overwhelming or underutilized.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize database queries and caching for better performance.
Assumption to check: The app can be slow at times, especially with large food databases.
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
Achieve your nutrition, calorie, macro & fitness goals with MyFitnessPal – the AI-powered food & fitness tracker with everything you need. Calories, macros, food, workouts – track it all in one place with one of the most comprehensive health, nutrition & fitness tracking apps available. Now with a built-in AI nutrition Coach for personalized guidance based on your goals and history. Plus GLP-1 journey support - log doses and set reminders in the app. Create personalized fitness & nutrition goals, build better habits around food, nutrition & calorie tracking and monitor your water intake. Download the app & start your free Premium trial today. With MyFitnessPal, you get food inspiration, an intermittent fasting tracker, science backed nutrition, and powerful fitness logging tools. MyFitnessPal is the #1 nutrition, macro & calorie tracking app in the U.S. – as featured in the New York Times, Forbes, the Today Show & U.S. News & World Report. More than a calorie tracker & food journal – MyFitnessPal is an AI-powered health, nutrition & fitness platform built to help you track macros, monitor nutrition progress & crush your fitness goals. NEW FEATURE: AI COACH ■ Nutrition insights tailored to your goals, habits, and logging history ■ Guidance to find what you need in the app, faster NEW FEATURE: GLP-1 TRACKING ■ Log & track how you feel on your GLP-1 medications to spot patterns in your symptoms & side effects. ■ Stick to your schedule with custom reminders for your GLP-1 medication ■ Build healthy habits that actually stick with simple, effective nutrition & medication for tracking your GLP-1 journey TRACK FOOD, CALORIES & MACROS WITH AI ■ Log meals effortlessly from 20.5M+ foods, including restaurant dishes – nutrition & calorie tracking made simple ■ Full nutrition & macro tracker breakdown – carbs, fat & protein – with custom targets for macros, protein, sodium, fiber & more ■ Stay hydrated with the built-in water tracker FITNESS TRACKING, WORKOUTS & PROGRESS ■ Log workouts & steps to monitor health, nutrition & calorie burn ■ Track calories, macros, nutrition stats & health insights at a glance or dive deep into the details ■ See how fitness activity, nutrition & diet affect your daily calorie goals ■ Wear OS support – calorie tracker, water tracker & macro tracker on your wrist. Add complications to the home screen for faster logging and the tile for tracking nutrients at a glance PERSONALIZED FITNESS PLANS & NUTRITION TOOLS ■ Customize calorie, nutrition & fitness goals – weight loss, gain, maintenance, or performance ■ Personalized nutrition & health dashboard – stats all in one place ■ Save meals & recipes for quick calorie, nutrition & macro logging ■ Streamlined meal planner to simplify nutrition tracking & hit your calorie & macro targets ■ Connect 40+ fitness trackers, smartwatches & health apps via one unified nutrition & fitness ecosystem ■ Find friends & motivation in the MyFitnessPal community PREMIUM ■ Faster nutrition, calorie & macro tracking with barcode scan, meal scan & voice logging ■ Customized macro, calorie & nutrition goals tailored to your fitness targets ■ Ad-free logging with built-in nutrition insights & calorie & macro progress comparisons ■ Net Carbs Mode – track net carbs across all food, nutrition & macro logs for keto and low-carb diets PREMIUM PLUS ■ All Premium features, including barcode scanning, now paired with full nutrition-focused meal planning ■ Personalized meal plans, integrated grocery delivery & smart calorie, nutrition & macro tracking tools ■ 1500+ healthy recipes tailored to your calorie, macro, nutrition & fitness goals MyFitnessPal is the leading health and fitness tracking app to help you conquer your calorie, nutrition & fitness goals. Download today & start your free Premium trial. View our terms & conditions and privacy policy: https://www.myfitnesspal.com/terms-of-service https://www.myfitnesspal.com/privacy-policy
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
@supabase/supabase-js
react-native-svg
expo-router
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.
