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
Japan Travel: Offline Guide
Navigate Japan with confidence — even without internet.
$1.99
PRICE
$1.99
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.
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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 included15 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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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 Japan Travel: 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 maps and guides for all attractions.
Assumption to check: Limited offline content can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a robust review system for user contributions.
Assumption to check: Lack of user reviews affects trust.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the search feature with filters and categories.
Assumption to check: Limited search functionality may hinder user experience.
Validate with people who use this workflow before building.
Hypothesis 4
Add a help section or FAQ for user assistance.
Assumption to check: No in-app support for 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
Navigate Japan with confidence — even without internet. The First Japan is a premium offline travel companion built for first-time visitors. Everything works without Wi-Fi or mobile data, so you are covered from the moment you land. OFFLINE DICTIONARY & PHRASEBOOK • 7,000+ entries covering stations, restaurants, shops, phrases, food vocabulary, and daily essentials • Lightning-fast search in English, Japanese, and Romaji • Tap any entry to see the kanji in large text — show it to locals for instant communication • Text-to-speech reads Japanese words aloud so you can learn pronunciation CULTURE & MANNERS GUIDES • 32 illustrated how-to guides: ride trains, use Japanese toilets, visit shrines, order ramen, and more • 20 etiquette guides so you never accidentally offend anyone • Bilingual content in English and Japanese KANJI ART • Discover your name or favorite words in beautiful Japanese calligraphy • Top 50 kanji that travelers love, displayed in dramatic brush-style lettering INTERACTIVE MAPS • Browse sights, castles, shrines, temples, onsen, and ski resorts by prefecture • Find nearby toilets and hospitals with one tap • GPS-powered map with search JAPANESE SHOPS DIRECTORY • Retail chains, restaurant chains, and hotel brands with Japanese names and descriptions • Know exactly what to expect at convenience stores, drugstores, and electronics shops BUILT FOR REAL TRAVEL • Works 100% offline — no Wi-Fi needed • 14 languages supported • Lightweight and fast on any device Download The First Japan and explore with peace of mind.
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
react-native-maps
react-native-image-gallery
react-native-async-storage
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.
