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
Avis - Car Rental
Avis Car Rental is one of the world's best-known car rental brands with over 5,000 locations in more than 165 countries
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
459,133 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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Avis - Car Rental: map the core Travel 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 a more advanced filtering and sorting system.
Assumption to check: Difficulty in finding the best car rental deals.
Validate with people who use this workflow before building.
Hypothesis 2
Add in-app chat support for users.
Assumption to check: Limited customer service options.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the booking flow to reduce steps.
Assumption to check: Complex booking process.
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed descriptions of rental terms and conditions at every stage.
Assumption to check: Lack of clear information on rental terms.
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
Avis Car Rental is one of the world's best-known car rental brands with over 5,000 locations in more than 165 countries. Book with confidence with our Best Price Guarantee* and save on your upcoming economy or luxury rental. Save time by skipping the counter with an Avis Preferred membership in the Avis Car Rental app.** Easily book, modify, and upgrade your rental vehicle from your phone. Sign into your Avis Preferred account to earn points and save your rental preferences. Book your car rental - Find Avis locations at an airport or city near you - Filter our fleet and find the perfect rental for your needs - Book your long- or short-term car rental with a few taps Access all car rental information in one place - Search for Avis locations and view details such as business hours, address, and phone numbers - View your receipts and information for upcoming trips - Get access to exclusive offers with Avis Preferred Contact us: Phone: 1.800.398.2847 Email: [email protected] *Terms & Conditions apply. Visit avis.com/bestprice for details. **Available at select locations and identity verification required on first Preferred rental. See avis.com/preferred for details. By tapping the Install button or by downloading the Avis App published by Avis Rent A Car System LLC, you consent to the installation of the Avis App and to its future updates and upgrades. You can withdraw your consent at any time by uninstalling the app. To request assistance with the removal or disabling of the Avis App, please contact us. You acknowledge and understand and agree that the Avis App (including any updates or upgrades) may cause your device to automatically communicate with Avis’ servers to deliver the functionality described above and to record location-based information and usage metrics, (ii) affect app-related preferences or data stored in your device, and (iii) collect personal information as set out in our Privacy Notice at https://www.avis.com/privacy and in the Avis App Terms of Use at https://www.avis.com/mobiletou. The Avis App delivers push notifications. You may turn push notifications off in the “Preferences” tab.
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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.
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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.
