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
Protein Tracker – Protin
Protein Tracker – Protin helps you track your daily protein intake without distractions.
$2.99 · In-app purchases
PRICE
$2.99
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.
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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 Protein Tracker – Protin: 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
Integrate a comprehensive food database API for better meal logging.
Assumption to check: Limited food database for tracking meals.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social sharing and challenges among users.
Assumption to check: Lack of social features for community support.
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed macro breakdowns in the progress section.
Assumption to check: Difficulty in tracking macronutrient ratios.
Validate with people who use this workflow before building.
Hypothesis 4
Add customizable notifications for meal logging.
Assumption to check: No reminders for users to log meals or track intake.
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
Protein Tracker – Protin helps you track your daily protein intake without distractions. Built for people who care about hitting their protein goal, Protin keeps things simple: log protein in seconds, see your weekly progress at a glance, and build a consistent protein habit over time. No calories. No macros. Just protein. Why Protin? • Minimal protein tracking focused only on what matters • Daily protein counter with clear progress • Weekly overview to see your protein intake in one glance • Protein streaks to stay consistent • Simple stats to track habits over time • Fast logging with custom presets Whether you’re training at the gym, building muscle, or just trying to hit your daily protein goal, Protin helps you stay on track without clutter. Private by default • No account • No ads • No cloud • All data stays locally on your device. This also means that if you change or reset your device, you’ll need to export and re-import your data to keep it. Your protein tracking stays yours. If you’re tired of complex fitness apps and just want a simple way to track protein intake every day, Protein Tracker – Protin is built for you.
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
Victory Native
Axios
React Navigation
Expo Secure Store
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.
