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
GPS Speedometer: MPH Tracker
Turn your iPhone into a professional Speedometer: Speedometer GPS with real-time precision and a futuristic interface
$24.99 · In-app purchases
PRICE
$24.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 ratings · Top 5%
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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Combine features and design from your favorite apps.
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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/
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 GPS Speedometer: MPH 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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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
Implement offline maps and speed tracking.
Assumption to check: Apps often lack offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Enhance GPS accuracy with frequent location updates.
Assumption to check: Accuracy issues with GPS tracking
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize display settings.
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 4
Offer more flexible pricing tiers or one-time purchase options.
Assumption to check: High subscription costs
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
Turn your iPhone into a professional Speedometer: Speedometer GPS with real-time precision and a futuristic interface. Speedometer: Speedometer GPS is built for drivers, cyclists, and runners who want total control and accuracy. With Accurate GPS Speedometer readings and a customizable dashboard, it transforms every trip into a smooth, modern experience. Unlike other apps, Speedometer: Speedometer GPS is more than a simple tracker—it’s an Accurate GPS Speedometer designed to deliver reliability, speed, and beautiful design in one app. Whether you’re driving through the city, cycling in nature, or tracking your runs, Speedometer: Speedometer GPS adapts perfectly to you. Main Features — Built for Accuracy and Style Accurate GPS Speedometer: Instant, stable, and precise readings in mph or km/h powered by advanced GPS calibration. HUD Speed Mode: Project the Accurate GPS Speedometer directly onto your windshield for safer night driving. Trip Recorder: Record distance, duration, max speed, and average speed automatically with Speedometer: Speedometer GPS. Multiple Designs: Switch between elegant speedometer styles—Odometer, Dual Ring, Neon Halo, Tilt 3D, Half Glass, and more. Custom Colors: Personalize your Accurate GPS Speedometer with your favorite RGB combinations. Free Speedometer App: Get the essential tools of Speedometer: Speedometer GPS completely free. Premium Upgrade: Unlock exclusive HUD designs, precision stats, and extra themes for your Accurate GPS Speedometer. Designed for Everyone — A Speedometer That Feels Perfect From minimalist dashboards to glowing neon dials, Speedometer: Speedometer GPS gives you total creative freedom. The Accurate GPS Speedometer layout is made for clarity at a glance—no distractions, no clutter. Speedometer: Speedometer GPS is ideal for: • Drivers who want a fast, reliable Accurate GPS Speedometer for safer journeys. • Cyclists who need to monitor speed and distance in real time. • Runners who prefer a precision Speedometer: Speedometer GPS app that adapts to their pace. • Travelers who value accurate data and a clean interface. Why Choose Speedometer: Speedometer GPS • Precision first — every Accurate GPS Speedometer reading is GPS-calibrated for stability. • Beautiful and legible — the Speedometer: Speedometer GPS interface is designed for instant readability. • Always evolving — continuous updates keep your Accurate GPS Speedometer ahead of the curve. • Simple setup — open, drive, and see your live speed in seconds. Experience the future of driving tools with Speedometer: Speedometer GPS — the only Accurate GPS Speedometer you’ll ever need. Reliable, elegant, and built for performance. Download Speedometer: Speedometer GPS today and take control of your trips with the most Accurate GPS Speedometer available on iPhone. Drive smarter, go faster, stay informed. Main page and contact: https://leonapps.netlify.app/pspeed/index.html Terms of service: https://leonapps.netlify.app/pspeed/terms.html Privacy policy: https://leonapps.netlify.app/pspeed/privacy.html
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
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BUILD KIT DIFFICULTY
Starter
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.
