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
Tina - Calorie Tracker
Meet Tina, a simple meal tracker built to make calorie and macro tracking faster, cleaner, and easier.
$1.99 · In-app purchases
PRICE
$1.99
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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Combine features and design from your favorite apps.
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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 included16 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 Tina - 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
Integrate a comprehensive API for a wider food selection
Assumption to check: Limited food database for logging meals
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and challenges functionality
Assumption to check: No social features for accountability
Validate with people who use this workflow before building.
Hypothesis 3
Include a feature for users to log recipes and their nutritional info
Assumption to check: Lack of recipe tracking
Validate with people who use this workflow before building.
Hypothesis 4
Implement a photo logging feature for visual progress tracking
Assumption to check: No progress photos feature
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
Meet Tina, a simple meal tracker built to make calorie and macro tracking faster, cleaner, and easier. Log your meals, estimate calories, and keep track of your daily nutrition without complicated screens or unnecessary clutter. Tina helps you understand what you eat, stay consistent, and work toward your fitness goals one day at a time. Whether you want to lose weight, maintain your progress, or build better eating habits, Tina gives you a simple way to stay on track. Key Features: - Track calories, protein, carbs, and fat - Log meals manually or with Tina’s AI estimate (AI estimate only available for devices supporting Apple Intelligence) - Set daily nutrition goals - View your daily progress clearly - Edit or delete meal logs easily - Simple, clean, and beginner-friendly design - Built for everyday calorie tracking Tina is designed to be fast, minimal, and easy to use. Tracking your food feels less like a chore and more like a habit. Tina’s estimates are only guides and may not always be 100% accurate.
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
Supabase
react-navigation
@react-native-chart/line
@supabase/supabase-js
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.
