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
FitHub - AI Calorie Tracker
Crush your fitness goals with FitHub, the AI-powered calorie and macro tracker that makes nutrition effortless.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
22,109 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 included15 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 FitHub - AI Calorie Tracker: 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 a community-driven food database to improve accuracy.
Assumption to check: Users often find calorie databases incomplete or inaccurate.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the UI and provide guided onboarding for new users.
Assumption to check: Some users feel overwhelmed by too many features.
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and challenges to engage users.
Assumption to check: Limited social features for accountability.
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
Crush your fitness goals with FitHub, the AI-powered calorie and macro tracker that makes nutrition effortless. Stop guessing and start seeing real results. FitHub uses cutting-edge AI to simplify meal tracking, giving you instant insights into your diet. Effortless AI Calorie Counting - Snap a photo of your food and get instant calorie estimates. - Get detailed nutritional information, powered by AI. Comprehensive Nutritional Insights - Track proteins, carbs, fats, and fiber with ease. - Use our AI-driven Calorie Calculator to stay balanced. Daily Calorie Tracking - Monitor your daily caloric intake with an intuitive tracker. - Visualize your progress and stay within your budget. Weight Tracking - Log your daily weight. - See your progress with our weight tracking chart. Ready to take control of your nutrition? Download FitHub today! We do not offer medical advice. All recommendations are AI suggestions that aren't 100% accurate. Please consult with a professional for medical diets or medical nutritional purposes. Important Information In-App Purchases Some features and content in FitHub require an additional in-app purchase. These premium features are clearly marked within the app as “In-App Purchase Required”. This ensures you always know which features are free and which require extra purchase before you decide to upgrade. Premium Subscription Unlock the full potential of FitHub with our premium subscription! For $9.99/month, you’ll receive: Exclusive Access: Unlock advanced tools and premium content. Ad-Free Experience: Enjoy uninterrupted use of the app. Regular Updates: Get access to new features, bonus content, and improvements as they are released. Subscription Terms: Your subscription will automatically renew each month unless you cancel at least 24 hours before the end of the current subscription period. Note: AI features such as scanning a barcode or taking a picture require a subscription. TERMS: https://www.fithubtrack.com/terms-and-conditions
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.
