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
Kalories
Looking up nutritional values and calculating down to the individual calorie takes time and effort
$1.99
PRICE
$1.99
No 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 included
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 Kalories: 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 comprehensive food database with barcode scanning and custom food entry.
Assumption to check: Limited food database for tracking meals
Validate with people who use this workflow before building.
Hypothesis 2
Add social features like sharing progress and challenges with friends.
Assumption to check: Lack of social features for accountability
Validate with people who use this workflow before building.
Hypothesis 3
Integrate with HealthKit/Google Fit for automatic calorie adjustments based on activity.
Assumption to check: No integration with fitness trackers
Validate with people who use this workflow before building.
Hypothesis 4
Enhance visual graphs and charts to track progress over time.
Assumption to check: Insufficient visual progress tracking
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
Looking up nutritional values and calculating down to the individual calorie takes time and effort. Kalories helps you roughly estimate calories instead. Just drag and release to add in steps of 50. Follow your 7 and 30 day average to stay motivated. Here are some foods that might be useful as reference points: A fruit: 100 calories An egg: 100 calories Milk 1dl / 0,45 cups: 100 calories Soup 1dl / 0,45 cups: 100 calories Pasta 100g / 3.5oz: 150 calories Rice 100g / 3.5oz: 150 calories Potato 100g / 3.5oz: 100 calories Broccoli & carrot 100g / 3.5oz: 50 calories Chocolate & candy 100g / 3.5oz: 550 calories Chips/crisps 100g / 3.5oz: 500 calories McDonalds Big Mac: 500 calories McDonalds cheeseburger: 300 calories McDonalds small fries: 250 calories (All calories in kcal) Happy estimating!
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
zustand
react-navigation
react-native-svg
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
