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
Speedometer Live
Speedometer Live is a fast, accurate, and simple speed-tracking app for iPhone and iPad.
$1.99 · In-app purchases
PRICE
$1.99
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
Make this idea yours
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 included18 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 Speedometer Live: 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
Offer offline mode to download maps and use basic features.
Assumption to check: Limited offline functionality, users can't access features without internet.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize GPS and data fetching to reduce battery usage.
Assumption to check: High battery consumption during use.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to choose different themes and display configurations.
Assumption to check: Lack of customizing speed display options.
Validate with people who use this workflow before building.
Hypothesis 4
Implement CarPlay support for a better in-car experience.
Assumption to check: No integration with CarPlay or Android Auto.
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
Speedometer Live is a fast, accurate, and simple speed-tracking app for iPhone and iPad. Whether you’re driving, biking, boating, or flying, the app shows your real-time GPS speed, average speed, distance, and trip time in a clean, easy-to-read interface. Record route Start recording by tapping the record button in the top-left corner. The button blinks while recording. Tap the same button again to stop recording. Recorded journeys can be viewed from Settings (gear icon in the top-right corner). The app can continue recording your route in the background, even when the app is not visible or the phone is locked. You do not need to start recording if you only want to use the app as a speedometer. Features: - Live GPS speed (km/h or mph) - Average speed, trip distance, and time tracking - Map view with location updates - Works offline — no internet required - Themes and minimal UI - Supports iPhone and iPad - Background route recording No clutter. Just clean and accurate speed tracking. Download Speedometer Live and hit the road. The app is intended for outdoor use, where your device has good GPS reception.
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
Victory Native
React Navigation
Zustand
React Native Maps
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.
