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
Fuel Tracker: Protein & Carbs
Fuel Tracker helps you stay consistent with your nutrition without the clutter, confusion, or complexity of traditional apps.
$0.99 · In-app purchases
PRICE
$0.99
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Fuel Tracker: Protein & Carbs: 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 barcode scanner for quick food entry.
Assumption to check: Users often find it hard to log food quickly.
Validate with people who use this workflow before building.
Hypothesis 2
Add more detailed graphs and historical data.
Assumption to check: Limited insights on progress over time.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI and make premium features clear.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate social features for sharing progress and challenges.
Assumption to check: Lack of social sharing features.
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
Fuel Tracker helps you stay consistent with your nutrition without the clutter, confusion, or complexity of traditional apps. If you are focused on hitting your protein goals, managing carbs, and building better daily habits, this app keeps everything simple and structured so you can stay on track. Stop guessing and start seeing real progress. WHAT YOU CAN DO * Track protein intake and hit daily targets * Monitor carbs and stay within your limits * Log meals quickly without friction * View daily progress at a glance * Track hydration, workouts, and reflections WHY FUEL TRACKER Most nutrition apps try to do everything and end up slowing you down. Fuel Tracker focuses on what actually matters: consistency, clarity, and simplicity. No clutter. No distractions. Just a system that works. WHO IT IS FOR * High protein diets * Low carb or keto tracking * Fitness focused users * Anyone tired of overcomplicated tracking apps Take control of your nutrition and build better habits one day at a time. Disclaimer: For informational purposes only, not medical or nutritional advice. Consult a physician or registered dietitian
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
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Zustand
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BUILD KIT DIFFICULTY
Starter
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.
