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- Speed GPS Tracker
Speedometer – Speed MPH Tracker
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 1.3
6 ratings · Below Average
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's included17 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 Speedometer- Speed GPS 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 more accurate GPS tracking algorithms.
Assumption to check: Inaccurate speed readings compared to GPS standards
Validate with people who use this workflow before building.
Hypothesis 2
Add advanced analytics for speed history.
Assumption to check: Limited features for historical data analysis
Validate with people who use this workflow before building.
Hypothesis 3
Create a cleaner, more focused interface.
Assumption to check: Poor UI/UX with cluttered design
Validate with people who use this workflow before building.
Hypothesis 4
Enhance app stability and performance testing.
Assumption to check: Frequent crashes on certain devices
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 – Speed MPH Tracker Speedometer is your all-in-one GPS speedometer, trip tracker, and smart driving assistant. Whether you’re in a car, on a bike, sailing, or just curious about your speed while walking — Speedometer provides real-time data with... Real-Time GPS Speed Tracking Speedometer uses GPS technology to accurately track your current speed in mph, km/h, or knots. Trip Statistics at a Glance Track your journey with real-time updates on: - Current, Average, and Maximum Speed - Total Distance - Travel Time - Altitude & Heading - Pause & Idle Detection All stats are saved in your Trip Log, where you can view detailed charts, maps, and history of each ride. Smart Features That Make a Difference - Speed Alerts: Set custom speed limits with visual and sound warnings - Map Mode: See your live route, current position, and travel path - HUD Mode: Projects your speed on your windshield for safer night driving - Fuel Cost Estimator: Calculate estimated cost based on distance, fuel price, and consumption - Compass & Location Sharing: Share your coordinates in emergencies - Apple Watch & iPad Support: Start/stop trips and view your speed right from your wrist. Subscription Features (SpeedMaster PRO) Unlock the full potential with SpeedMaster PRO for: Unlimited Trip Log Ad-Free Experience Advanced Export & Sharing Siri Shortcuts & Background Tracking Note To ensure accurate speed readings, use the app under open sky with strong GPS signal. Continued use of GPS in the background may reduce battery life. Drive smarter. Travel safer. Track better — with Speedometer. https://www.swappyazilim.com/terms.html https://www.swappyazilim.com/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
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.
