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
Fitmeter Run - GPS Tracker
Fitmeter Run turns your iPhone into a running computer with incredible functionality
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
129 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Fitmeter Run - GPS 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
Allow users to create and save custom workout plans.
Assumption to check: Limited customization options for workouts.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear explanations and a trial for premium features.
Assumption to check: In-app purchase confusion regarding premium features.
Validate with people who use this workflow before building.
Hypothesis 3
Implement enhanced GPS tracking algorithms.
Assumption to check: GPS accuracy issues during long runs.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social challenges and community features.
Assumption to check: Lack of social features for motivation.
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
Fitmeter Run turns your iPhone into a running computer with incredible functionality. Your session is tracked GPS based and all data is presented in real-time. The app is designed for a wide user base, from amateur to professional. Features: - GPS based position and route of the session will be displayed on a map including distance markers - Distance - Duration of the session - Pause time - Auto Pause detection - Current pace - Pace of last mile - Fastest mile - Altitude tracking. Uphill / Downhill - Burned calories - Heart rate sensor support - Split times - History. All activities will be stored and can be reviewed. No session count limitation - Export all activities to a CSV file - Statistics for a session. Speed, altitude and pulse over distance - Statistics over the last 10 sessions - Records. See your all-time records and a summary over all sessions - Apple health support: Read the weight and use it calculate the burned calories Save the workout and its activity energy - Facebook support. Post sessions to your Facebook timeline - Ad free - No registration required - No annoying notifications - No marketing emails Continued use of GPS running in the background can dramatically decrease battery life.
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.
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BUILD KIT DIFFICULTY
Advanced
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.
