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.
GPS Speedometer is a comprehensive speed measurement application that integrates vehicle, bicycle, and running speed measurement
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 HUD - SpeedAce: 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: Inaccurate speed readings in certain areas
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for UI
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Ads interrupt user experience
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of offline functionality
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.
GPS Speedometer is a comprehensive speed measurement application that integrates vehicle, bicycle, and running speed measurement. It aims to provide you with accurate real-time speed, distance, average speed, maximum speed and other key data. Whether you are commuting, long-distance travel, cycling adventure, or running exercise, GPS Speedometer can be your indispensable partner. Why choose GPS Speedometer? Real-time speed display: Through GPS positioning technology, the current speed is displayed in real time, so that you can always understand the driving or running status and ensure safety. Trip tracking: Automatically record your driving or running track, including total distance, average speed, maximum speed, etc., so that you can easily review the detailed data of each trip or exercise. Multiple sports modes: Support multiple sports modes such as vehicle, bicycle, running, etc. to meet the speed measurement needs of different users. Smart Pedometer: Track your steps in real time, so that every exercise is clearly visible. The application provides detailed historical data statistics to witness your persistence and progress. Even when running in the background, it can accurately record steps in low power mode to provide you with a seamless experience. Picture-in-Picture: With our new picture-in-picture feature, you can always check your current speed while using other applications. Whether you are on a call, in a meeting, or listening to music, the current speed will be displayed in a small floating window. Speed limit alarm: Set a safe speed limit. When it exceeds the set value, the app will issue a warning to remind you to slow down or adjust the speed to ensure safety. History: Save detailed data of each trip or exercise, so that you can compare the performance of different trips or exercises, analyze habits, and improve efficiency. More power saving: Optimize battery use to ensure long-term operation without affecting daily use. GPS speedometer can be used in the following scenarios: Daily commuting, understand commuting time, and plan the best route. Long-distance travel, record trip details, and share travel stories. Cycling adventure, track cycling tracks, and improve cycling skills. Running exercise, analyze running data, and improve running results. Download GPS speedometer to make every trip or exercise a wonderful journey! Note: Features you can use for free: GPS speedometer, real-time speed display, smart pedometer, speed limit alarm, music player, compass, distance measurement, LED banner. And you can view a limited number of historical trip tracking records and a limited number of historical data details. Features that require the purchase of a subscription service: view unlimited historical trip records, unlimited historical data details, head-up display function, picture-in-picture function, and switch dashboard skin. If you subscribe through Apple, the fee will be deducted from the App Store account when the purchase is confirmed. Subscriptions will automatically renew unless auto-renewal is turned off at least 24 hours before the end of the current period. The account will be charged for renewal at the rate of the selected plan within 24 hours before the end of the current period. After purchase, you can go to the App Store account settings to manage subscriptions and auto-renewal. Privacy Policy: https://speedometerapp.net/privacy Terms: https://speedometerapp.net/terms
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.