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
Cuspart: GPS
Cuspart transforms your iPhone into a precision driving instrument.
$0.99 · In-app purchases
PRICE
$0.99
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.
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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 included15 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 Cuspart: GPS: map the core Sports 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
Incorporate social sharing and activity challenges.
Assumption to check: Limited user engagement due to lack of social features.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to categorize and filter activities by type.
Assumption to check: Difficulties in tracking multiple sports activities.
Validate with people who use this workflow before building.
Hypothesis 3
Provide users with insights and statistics on their performance.
Assumption to check: No detailed analytics of activities.
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to customize their profiles with achievements and goals.
Assumption to check: Limited customization for user profiles.
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
Cuspart transforms your iPhone into a precision driving instrument. Built for automotive enthusiasts who demand accuracy, Cuspart combines a high-performance GPS speedometer with advanced acceleration and performance timers—designed for testing on closed tracks or controlled environments. Whether you are measuring your vehicle’s 0–60 performance on the track or using a reliable digital speedometer for everyday driving, Cuspart delivers real-time data through a refined, intuitive interface built for clarity and speed. KEY FEATURES Precision Acceleration Timer Accurately quantify your vehicle’s performance with intelligent, automated start-stop detection. Cuspart recognizes vehicle movement to capture precise sprint times—no manual input required. • Acceleration Tests: Measure 0–60 mph, 0–100 km/h, and 100–200 km/h. • Drag Performance: Track standard distances including 1/4 mile, 1/2 mile, 100 meters, and 1000 meters. • Auto-Logging: Every run is automatically saved to your history for future analysis. Dynamic Dashboard Modes Choose the display style that best fits your driving environment and personal preference: • Analog Gauge: A classic needle-style speedometer inspired by traditional performance dashboards. • Digital Dash: A large, high-contrast digital readout optimized for instant visibility at speed. • Map Integration: Monitor real-time speed while tracking your live route and location on an interactive map. Performance Analysis & History Go beyond simple timing with detailed performance insights: • Speed Graphs: Visualize acceleration curves to better understand power delivery and gear changes. • Comprehensive Records: Review all saved runs with precise date and time stamps to track progress over time. Head-Up Display (HUD) Improve night-time visibility and focus. HUD mode mirrors the speedometer onto your windshield, allowing you to monitor key metrics while keeping your attention on the road ahead. Customization • Units: Instantly switch between Imperial (mph) and Metric (km/h) systems. • Design: A carefully optimized dark theme reduces glare and ensures excellent readability in all lighting conditions. Download Cuspart today and turn your iPhone into a professional-grade performance and speed-tracking tool. *Disclaimer: Cuspart uses GPS data to calculate speed and distance. Accuracy may vary depending on device hardware, satellite signal quality, and environmental conditions. Always comply with traffic laws and use this application responsibly.
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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
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.
