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
CarGurus: Used & New Cars
Find your next car with confidence
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
670,070 ratings · Top 5%
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 CarGurus: Used & New 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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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 options with multi-select capability.
Assumption to check: Users report difficulty in filtering search results effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image loading with caching and placeholders.
Assumption to check: Some users find the image loading slow.
Validate with people who use this workflow before building.
Hypothesis 3
Redesign messaging UI for better usability and quicker access.
Assumption to check: In-app messaging is not user-friendly.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance car detail pages with more comprehensive data and user reviews.
Assumption to check: Limited information on some cars.
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
Find your next car with confidence. CarGurus helps you find the best cars fast, spot great deals, and understand how prices compare in the market. Discover and compare new, used, and certified pre-owned cars in one place. Search with detailed filters, set real-time price alerts, check transparent deal ratings, and verify car history. Spend less time searching across sites and have confidence in every step of the car shopping journey. KNOW YOU’RE GETTING A FAIR PRICE See deal ratings, price history, days on lot, and comparable cars so you know how a car’s price compares to the market. When you’re ready, contact the dealer to confirm availability, pricing, and next steps with a few taps. FIND THE RIGHT CARS FASTER Access powerful filters or search in your own words to get your top matches across millions of sedans, pickup trucks, SUVs, minivans, EVs, and more. Turn on real-time alerts and get price drops to get new matches while you go about your day. GET THE FULL STORY ON EVERY CAR See car history, dealer reviews, and full car details in one place so there are fewer surprises later. Need a second opinion? See your top picks side-by-side and get an expert pros and cons breakdown of each listing. NAVIGATE THE DEALERSHIP CONFIDENTLY Use Dealership Mode to pull up inventory right from the lot, double-check the details, and estimate your all-in price as you work out your offer. Discussing a trade-in? Get instant offers to see what your car is really worth before you sell your car. Download the CarGurus app and join the millions of shoppers who use CarGurus to find cars for sale and get great car deals.
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
Axios
Zustand
React Native Image Carousel
Expo
Shadcn/UI
BUILD KIT DIFFICULTY
Expert
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.
