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.
Buy, sell or trade your car 100% online
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Carvana: Buy/Sell Used Cars: map the core Shopping workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited car selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent image quality.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Slow customer service response times.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Complex selling process.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Buy, sell or trade your car 100% online. With the Carvana app, you can shop where you want, when you want, wearing whatever you want. Search over 45,000 Carvana used cars for sale, get instant, personalized financing terms, and find a car that fits your budget. Buy online and then track your delivery, all in one place. Plus, you can choose to get your vehicle delivered to your door or pick it up at a Car Vending Machine. Have questions? No problem! Our friendly and knowledgeable Customer Advocates are here to support you every step of the way so you can shop with confidence. Plus, all purchases are protected by our 7-Day Money Back Guarantee. That means you have 7 days to make sure your new ride fits your life. If you don’t love it, we'll pick it up and bring you a different one, or provide a full refund. You decide. With the Carvana app, you can: Buy a Car - Search over 45,000 vehicles - Check out the vehicle interior and exterior with our 360-degree spinner - View financing terms as you search - Get a free CARFAX™ report for every vehicle - Track your delivery all the way to your door Sell and Trade Cars - Get an instant and custom appraisal offer on your car - Tell us how you want to get paid - Schedule an appointment to sell your car - Get a trade-in offer in less than 3 minutes, with no inspection required - Apply your trade-in toward the purchase of your next car for a lower monthly payment Get Financing - Get instant and personalized financing terms without impacting your credit in just minutes - Find a car that fits your budget - Make auto loan payments—manual and autopay options are available - View your auto loan details Stay Connected - Save your favorite vehicles - Get new inventory and price drop alerts - Learn about any recalls on your car Buy online. Get it delivered. Love it or return it within 7 days. Download the Carvana app now and discover all the ways We’ll Drive You Happy®.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.