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
Big Island Offline Guide
Tired of those clunky paper maps and ad-filled brochures from airports and rental car counters? We’ve got you covered!
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
20 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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.
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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 Big Island Offline Guide: 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
Ensure comprehensive offline access to all features.
Assumption to check: Limited offline content for some users
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly map interface.
Assumption to check: Navigation can be confusing in unfamiliar areas
Validate with people who use this workflow before building.
Hypothesis 3
Optimize image loading and caching.
Assumption to check: Occasional lag when loading images
Validate with people who use this workflow before building.
Hypothesis 4
Add a review and rating system for attractions.
Assumption to check: Lack of user-generated content
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
Tired of those clunky paper maps and ad-filled brochures from airports and rental car counters? We’ve got you covered! Introducing Big Island by I Heart Travel! Explore over 120 of our favorite Big Island, Hawaii photo spots, complete with offline maps, directions, photos, and detailed descriptions, all in the palm of your hand. Best of all, our app works without a cell signal! Simply download our offline guide to your phone and, like magic, the app will work when you don't have a cell signal. You'll be able to check in and save attractions, add new photos, and find the exact locations of all the coolest Big Island spots including Akaka Falls, Thurston Lava Tube, Rainbow Falls, Punaluu Black Sand Beach, and Waipio Valley Lookout - all without having a working internet connection. Bookable Experiences Alongside our 120+ unique photo spots, we now offer over 50 handpicked, bookable adventures right in the app. Zipline over Akaka Falls, explore Volcanoes National Park on an e-bike, take a submarine cruise from Kona Beach, swim with manta rays on a night snorkeling adventure, and so much more! Leave No Trace When visiting any attraction, whether in our app or not, please be respectful and leave it just as you found it. Take only photos and leave only footprints. To learn more, visit LNT.org. Happy exploring, The I Heart Travel Team
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 Native
Expo
React Navigation
Async Storage
Mapbox
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.
