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
XLR8
Wish you owned an exotic supercar? Now you can with XLR8!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.0
168 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 XLR8: map the core Entertainment 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 extensive customization features and upgrades.
Assumption to check: Limited car customization options
Validate with people who use this workflow before building.
Hypothesis 2
Focus on improving user feedback and app performance.
Assumption to check: Poor user ratings and reviews
Validate with people who use this workflow before building.
Hypothesis 3
Introduce diverse race types and challenges.
Assumption to check: Lack of variety in race types
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and enhance user onboarding.
Assumption to check: Confusing navigation
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
Wish you owned an exotic supercar? Now you can with XLR8! XLR8 (pronounced accelerate) is an exciting new app from 2XL Games that makes your car sound like an exotic supercar as you drive! Connect your iPhone, iPod or iPad to your car stereo and you are off and running. Once secured inside your vehicle, XLR8 uses the accelerometers of your device to realistically respond to acceleration, braking and cornering forces. Select from one of five exciting engines: - Classic V8 muscle car - NASCAR engine - Ford GT40 - Ferrari sports car - Lamborghini Supercar Dazzle your friends when you roll into the parking lot with the sound of a lumbering muscle car. Each engine realistically delivers the thrill of driving a different type of supercar. Uses Hollywood quality recordings of the real engines to sound totally authentic. Tune the performance of your engines by adjusting the shift point and gear ratios. Sound like you are burning out your tires and drifting without driving recklessly. Supports both cabled and wireless Bluetooth audio connections to your car stereo. Some vehicle Bluetooth connections can experience a slight delay. Automatic Mode measures the acceleration of your car and Manual Mode lets you control the engine by hand. XLR8 works well with any device, but works best with a GPS. Drive the car of your dreams – XLR8
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
Axios
React Navigation
Shadcn/UI
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.
