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
Nutrition Complications
Nutrition Complications is a standalone Apple Watch Application.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 ratings · Below Average
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/
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 Nutrition Complications: map the core Food & Drink 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
Focus on a modern, user-friendly design.
Assumption to check: Poor user interface and design
Validate with people who use this workflow before building.
Hypothesis 2
Ensure a comprehensive database of foods and complications.
Assumption to check: Limited food database
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate articles and tips to keep users informed.
Assumption to check: Lack of engaging content
Validate with people who use this workflow before building.
Hypothesis 4
Offer a more competitive price or value through a subscription.
Assumption to check: High price for 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
Nutrition Complications is a standalone Apple Watch Application. Allows to track nutrition facts such as calories, carbs, fat, fiber, protein, cholesterol, sodium and water from Health or Nutrition+ apps integration to Health app or optional integration to Nutrition+ app via https://glucoseplusapp.com user's account, thus adding an extra colour-coded complication to track an additional nutrition fact level. Allows to add water readings quickly to Health app and to Nutrition+ app. Allows to customize nutrition facts tracking limits for both apps used by the complication and rings. The complication could display any current nutrition fact level as per user's convenience, the app automatically syncs the latest levels keeping the complication updated both the number and the colourful gauge. Apple Watch notifies accordingly high or low levels of the current nutrition fact being tracked, also advises by voice when app is active. Finally it displays all and every current nutrition fact level colour-coded rings in one shot and individually displaying its current reached level percentage.
Written user reviews are not shown here. Check current App Store reviews >
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
Axios
React Query
@react-native-async-storage/async-storage
expo-router
BUILD KIT DIFFICULTY
Intermediate
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.
