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
Vellumi: Cruise Journal
Your cruise is more than an itinerary.
$3.99
PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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
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Combine features and design from your favorite apps.
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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 included17 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.
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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.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Your cruise is more than an itinerary. It is the first glimpse of the ship from the terminal. The view from your balcony. A meal you still talk about. A perfect sea day. A new port. A show you loved. Someone you met along the way. Hundreds of moments you do not want to forget. Vellumi: Cruise Journal gives those moments a private place to live. Create a voyage and keep the people, places, and details that made it yours—even when ship Wi‑Fi is unavailable. CAPTURE THE WHOLE VOYAGE • Write journal entries for the moments you want to remember • Add photos and videos from your library or camera • Record private voice notes • Remember meals, restaurants, shows, excursions, and other experiences • Keep private notes, contact details, and a photo for people you meet • Choose a private cover photo for each voyage YOUR VOYAGE, DAY BY DAY Build an itinerary around your sailing, including ports, sea days, arrival and departure times, all-aboard times, and time zones. Keep memories connected to their cruise day. Search your journal, revisit completed voyages, and rediscover favorite moments whenever you want. PRIVATE, ON YOUR DEVICE Vellumi encrypts your local journal and its app-managed media copies on your device. Create a device-local passcode when you begin, then enable biometric unlock on supported devices if you choose. No account is required, and core journaling works without a continuous internet connection. Vellumi requests camera, photo-library, microphone, speech-recognition, or location access only when you choose a feature that needs it. Location is optional and can be attached to a memory as a readable place label when available. SHARE ON YOUR TERMS Choose a memory to share its story text or one selected photo, video, or voice note. Share an itinerary only when you choose to. Vellumi opens your device's normal share sheet; it never posts, sends, or uploads your journal automatically. Review the selected text or attachment before sharing: the destination you choose handles it under its own privacy practices, and media may retain metadata from its original file. OPTIONAL LIVE SHIP TRACKING If you add a valid ship IMO number, Track My Ship Live can open the corresponding public CruiseMapper page. Live tracking needs an internet connection. CruiseMapper is an independent third-party service and is not affiliated with Vellumi. Your voyage deserves more than a camera roll. Remember what it felt like to be there.
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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.
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
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.
