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
SpeedGunner
SpeedGunner uses your iPhone's camera, lidar and computer vision to measure vehicle speeds in your neighborhood.
$1.99 · In-app purchases
PRICE
$1.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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 SpeedGunner: map the core Utilities 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 calibration options and user guidelines for optimal sensor usage.
Assumption to check: Users often find measurement accuracy inconsistent.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the history feature to allow filtering and sorting by date or speed.
Assumption to check: Limited history tracking options.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize themes and layouts.
Assumption to check: No customization options for the user interface.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify benefits of in-app purchases and make trial features more accessible.
Assumption to check: In-app purchases may confuse users.
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
SpeedGunner uses your iPhone's camera, lidar and computer vision to measure vehicle speeds in your neighborhood. FEATURES: • Real-time speed detection using advanced computer vision • Two measurement modes: Vehicle Tracking (side profile) and License Plate (approaching) • Automatic LiDAR distance calibration on supported devices • Auto-capture with photo evidence when speed threshold is triggered • Seven-segment LCD-style speed display • Encrypted local data storage with CSV export • Thermal throttling management for sustained use • Camera shake compensation HOW IT WORKS: Point your iPhone at a road from a fixed position. SpeedGunner detects passing vehicles using advanced computer vision. Results are displayed in a classic digital readout style. IMPORTANT: SpeedGunner is a consumer tool for neighborhood safety awareness. Speed measurements are estimates and are not suitable for law enforcement or legal proceedings. Do not use while driving.
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
React Native
Expo
Redux
expo-sensors
react-navigation
axios
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.
