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 Box App
speed box free is a free speedometer, odometer and compass for the iphone
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
37,357 ratings · Top 15%
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 Speedometer Speed Box App: 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 reliable GPS algorithms and filtering.
Assumption to check: Inaccurate speed readings in certain areas
Validate with people who use this workflow before building.
Hypothesis 2
Add a detailed trip history screen for users to view past trips.
Assumption to check: Limited trip history visibility
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize display settings like color themes and units.
Assumption to check: Lack of customization options for speed display
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free experience for premium subscribers.
Assumption to check: Ads can be intrusive
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
speed box free is a free speedometer, odometer and compass for the iphone. track your speed and distance from your iphone! * mph, km/h and knots display * 5 beautiful speedometers * digital speedometer * distance * set distance to arbitrary value by tapping it * portrait and landscape mode * for iphone and ipad in addition you can get more features with the "pro pack": * 10 designs * map view * compass display * maximum speed, average speed and current altitude * track top speed * track altitude * change maximum speed of the analog speedometers * speed warning! don't get caught speeding again! * automatic distance reset (day trip meter) you can now have the accuracy of our commercial products in this free application. the application uses our long experience to calculate the speed as accurate as possible. switch between mph and km/h and select one of 3 beautiful analog or digital displays. our application even supports rotating your device.
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 Navigation
Expo Location
Axios
React Native Maps
Zustand
Shadcn/ui
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.
