App Overview

KAYAK: Flights, Hotels & Cars icon

KAYAK: Flights, Hotels & Cars

KAYAK · Travel

KAYAK searches hundreds of travel sites to show you your options and let you pick what works best for your trip

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
495,928 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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for KAYAK: Flights, Hotels & Cars: 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 unified search algorithm that provides consistent results for flights, hotels, and cars.

Assumption to check: Inconsistent search results across different categories

Validate with people who use this workflow before building.

Hypothesis 2

Enhance in-app messaging to facilitate better communication between users and service providers.

Assumption to check: Limited in-app communication features

Validate with people who use this workflow before building.

Hypothesis 3

Optimize API calls and data caching to improve load times and user experience.

Assumption to check: Slow loading times for listings

Validate with people who use this workflow before building.

Hypothesis 4

Simplify onboarding and provide guided tours to help users navigate the app effectively.

Assumption to check: Confusing user interface for new users

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

KAYAK searches hundreds of travel sites to show you your options and let you pick what works best for your trip. Track prices, set a budget, build your itinerary and more. WHAT’S IN OUR APP. • Get the flight you want: Compare flight options from hundreds of sites then zero in on the best one for you by using our filters. • Hotel rates only on the app: Find mobile-only prices from select hotels. • Car sharing: Search car sharing alongside traditional agencies for more options (and maybe better prices). • Know when prices change: Track search results for your trip and get a notification when prices change. • Search on your budget: Only have $300 to spend? KAYAK Explore will show you your flight options, on any budget. ONLY ON THE KAYAK APP. • Flight tracker: Get alerts when something about your flight changes or track flights so you can see if you’ll make your connection. • Trips offline: All your ticket confirmations and reservations loaded into Trips are accessible regardless of whether or not you have Wifi. • Measure your bag: Direct your camera at your bag or carry on and we’ll let you know if it’s the right size for your flight without incurring a fee. WE LOVE FEEDBACK. Got a question and in need of support? Send us a message at https://www.kayak.com/help and we’ll help you out. MORE ON WHAT KAYAK OFFERS. Find flights, hotels, vacation rentals, rental cars and more - then filter by what matters to you most. Like a pet-friendly boutique hotel with a pool. Or a 4-door sedan with airport pick-up to get you on your way. We bring together great deals from your favorite travel sites in one place. SEARCH HUNDREDS OF FLIGHT SITES AT ONCE. With filtering and flexibility options, you can quickly search and book what works best for your trip. MORE OPTIONS, MORE SAVING. Find mobile-only rates and exclusive deals on the app. Set Price Alerts to know when prices drop on the flights, cars and hotels you’re interested in. CREATE ITINERARIES AS YOU PLAN. Our Trips tool puts all your plans in one place. Get alerted to flight and gate changes, access boarding passes both on- and offline, and share your itinerary with friends – all in one spot. You can sync your inbox or manually add any part of your trip - from tour and restaurant confirmations to notes on things to see. CAR RENTAL DEALS. Search from over 70,000 locations to find the perfect rental car. Book risk-free by filtering for free cancellation policies. GET A HOTEL… OR A HOME. See your accommodation options from major hotel chains and resorts to local boutiques to apartments, cabins, beach homes and more. Filter for free cancellation if you’re worried plans will change. Plan your next trip with KAYAK. Download now to start planning a great trip.

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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.

SUGGESTED BUILD STACK
React Navigation
Supabase
Axios
React Native Gesture Handler
Expo
Zustand
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.