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
Winter Sports: Track Calories
“Winter Sports: Track My Calories” will help your Apple Watch counting how many calories did you burn during your winter sports activity.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
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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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 Winter Sports: Track Calories: 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
Expand the list of sports and allow user submissions.
Assumption to check: Limited sports activities available
Validate with people who use this workflow before building.
Hypothesis 2
Enhance graphs with more detailed insights and interactive features.
Assumption to check: Basic visualizations
Validate with people who use this workflow before building.
Hypothesis 3
Add social features for sharing workouts and challenges.
Assumption to check: No community features
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more reliable syncing mechanism with HealthKit or Google Fit.
Assumption to check: Inconsistent data syncing
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
“Winter Sports: Track My Calories” will help your Apple Watch counting how many calories did you burn during your winter sports activity. ACTIVITY Track your calories, save results to your history of Activities and then view detailed summary per minute! App can count your calories during the next activities: • Cross Country Skiing; • Curling; • Downhill Skiing; • Hockey; • Ice Skating; • Sledding; • Snowmobiling; • Other. SUMMARY You can view the overall summary from all "Track My" series apps you have installed on your iPhone. Find out total steps, distance and calories recorded during the all your Activities. Also you can view the summary per each app separately. MORE View the list of all existing “Track My“ series apps. Easily navigate between them or install them directly from the App Store. Also you will few great suggestions how to improve your fitness experience. HEATLH INTEGRATION App has integration with Health app, so all your progress is also will be stored in there. Check out more apps from “Track My” series!
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
Axios
react-navigation
react-native-charts-wrapper
expo-secure-store
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.
