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.
Track your speed with GPS accuracy using the ultimate GPS Speedometer & Odometer app
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for GPS Speedometer, Speed Tracker: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Some users report GPS inaccuracies.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for tracking settings.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Ads disrupt user experience.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulty sharing trip data.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Track your speed with GPS accuracy using the ultimate GPS Speedometer & Odometer app. Whether you’re driving a car, riding a bike, or hauling with a truck, this speed tracker gives you real-time speed, distance, and trip data — all in one lightweight app. Why choose our GPS Speedometer app? • Real-time GPS speed tracking with high accuracy • Digital odometer to track trip distance • HUD mode to reflect speed on your windshield • Speed alerts with customizable warnings • Works offline — no internet needed • Supports mph, km/h, m/s, and knots • Compact app size with zero bloat Key Features: • Speed Tracker – Instantly measure your current speed in real time • Odometer – Record trip distance for car, bike, or any vehicle • HUD Display – View speed in a mirrored format for night driving • Trip History – Save and review past routes with detailed stats • Compass Mode – Always know your direction • Live Weather – See current weather while you drive or ride • Floating Window – Monitor speed over other apps like Google Maps • Battery Efficient – Optimized for low power usage Use it for: • Replacing or supplementing your vehicle’s speedometer • Testing bike or scooter speed • Measuring travel during trips, runs, or commutes • Tracking mileage and location during daily drives • Recording trip data with optional export This GPS Speedometer: Speed Tracker app is trusted by millions of users worldwide for accurate speed, distance, and travel tracking. With its clean interface and powerful tools, it’s perfect for drivers, cyclists, runners, and logistics professionals alike. Download now and experience a feature-rich GPS speedometer and odometer app that keeps you in control of your journey — on road, off-road, or in the air. Important: The app may not work in devices which don''t have GPS receiver like iPad with WiFi only.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.