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
Carnival HUB
Use the Carnival HUB app to prepare for your cruise, explore and book shore excursions, spa treatments, drink packages and more
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
448,471 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
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 Carnival HUB: map the core Travel workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 offline access to schedules and messages
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Streamline UI for better navigation and readability
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Optimize chat functionality for faster responses
Assumption to check: In-app messaging can be slow
Validate with people who use this workflow before building.
Hypothesis 4
Add a robust search and filter feature for activities
Assumption to check: Difficulty in finding specific activities
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
Use the Carnival HUB app to prepare for your cruise, explore and book shore excursions, spa treatments, drink packages and more. When the time comes, you may also check-in and obtain your boarding documents. As you board your ship, connect to Carnival’s Wi-Fi to view what’s happening, weather, dining menus and more! Onboard internet purchase is NOT required to use the Carnival HUB app. Before your cruise: • Load up on excursions, drink packages, spa treatments and more • Check-in and prepare your boarding documents • Share your cruise countdown with friends and family Once on board: • Chat to connect with family and friends on board. (Low, flat activation fee applies.) • Day-by-day schedule of hundreds of onboard events • Choose your favorite events and get reminders • Open times of food and drinks venues • Daily restaurant menus • Searchable deck plans with key areas highlighted • Itinerary details, including current ship time, arrival/departure times for upcoming ports of call • Real-time information on guests’ current Sail & Sign shipboard account balance • Weather for each day of your sailing • Find information like dining attire easily • Ability to view and purchase shore excursions • Order food and beverages for delivery almost anywhere on board (Fees apply.) • Check into a virtual queue and skip the line! We'll simply notify you when it's your turn Go ahead. Download it now. Your vacation deserves it.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Firebase
React Navigation
Redux
Axios
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.
