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
Speedo GPS Speed Tracker, Car Speedometer, Cycle Computer, Trip Computer, Route Tracking, HUD
Speedo GPS is a fancy and unique combination of GPS Speedometer and Trip computer in one application.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
3 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/
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 Speedo GPS Speed Tracker, Car Speedometer, Cycle Computer, Trip Computer, Route : 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 advanced filtering algorithms for better accuracy
Assumption to check: Inaccurate speed readings in poor GPS conditions
Validate with people who use this workflow before building.
Hypothesis 2
Add features like trip sharing and analytics
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Simplify UI with clearer navigation and icons
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate offline maps and trip recording capabilities
Assumption to check: Lack of offline functionality
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
Speedo GPS is a fancy and unique combination of GPS Speedometer and Trip computer in one application. What you get when buying Speedo GPS A lot of great features built-in. Speedo GPS gather all the necessary trip/route statistics. Just start the application and Speedo GPS will automatically record your geo data (longitude latitude), speed, average speed, start time, elapsed time, distance, altidute and many more. Use the Speedometer App in your car, on your bicycle, in the train or airplane or when you are walking or wander. The app will help you to log all the nessecary data of your trips. NO ADS no advertising in the app, that i guaranteed!!! Universal App Buy once and use it on your iPhone and iPad. High resolution graphics for Retina Display (iPhone4, iPhone 5 (s) and new iPads. HUD Head-up display – this cool feature is also available. Just enable HUD and put your iPhone or iPad under the windshield. The device projects the current speed to the windshield. So you are no longer distracted from looking ahead and have everything in sight. Orientation The view adapts to the orientation of the iPhone. GPS Navigation with map display You ever have the possibility to switch to the map (satellite or hybrid view), so you see where you are or where you will go. Real Time Statistics Get graphical statistics about speed, average speed, altitude, average altitude. Export data Export all the recorded data via email or iTunes file sharing. (CSV, XML, KML, GPX) and analyse the data on your mac or pc. Please NOTE: GPS usage will dramatically reduce device battery life. Its recommend to use a charger. GPS isn't always accurate due to device hardware sensor limitations. To see the map a data connection is required. Make sure that you have location services enabled for the application. Enable it in - Settings> General> Location Services Videos: iPhone: http://youtu.be/YdOuA482SyQ iPad: http://youtu.be/It5axbiohTs HUD: http://youtu.be/xniJyVQFmSQ
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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
Supabase
Victory Native
react-navigation
expo-location
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.
