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.
Japan Travel by NAVITIME is a Japan transit and trip-planning app that helps international visitors navigate Japan stress-free — by train, shinkansen, bus, taxi, ferry and on foot
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Japan Travel - Smart Transit: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Japan Travel by NAVITIME is a Japan transit and trip-planning app that helps international visitors navigate Japan stress-free — by train, shinkansen, bus, taxi, ferry and on foot. Pass-aware route search (incl. the JR Pass), 100% bus route coverage including rural areas, travel guides, itineraries that auto-calculate travel times, and shinkansen ticket booking — all in one app, trusted for over 10 years. Key Features [Route Search] Find the best route anywhere in Japan in seconds — shinkansen, JR, subways, local trains, buses, taxis, ferries and flights. Choose from 50+ rail and unlimited-ride passes such as the Japan Rail Pass, JR TOKYO Wide Pass and Tokyo Subway Ticket, and see which legs your pass covers, which cost extra, and what you actually pay. See which car to board and which platform, whether to board a bus at the front or rear and pay when boarding or getting off, a 6-level crowding forecast per leg, and less crowded trains just before or after. Searches factor in real-time train and shinkansen delays and show detours around them. You can also set a slower walking speed for large luggage, or search for routes with fewer stairs, staying dry in the rain, or step-free access. Hold your IC card (Suica, PASMO and more) to your phone to check its balance, and find luggage storage along your route. [AI Camera Guide "Check & Ride"] Not sure the train or bus in front of you is the right one? Photograph the platform departure board or bus destination sign. AI reads the Japanese display instantly and tells you whether it matches the route you searched — no Japanese language skills needed. [Travel Guides & Itineraries] Articles on Tokyo, shinkansen tips, Japan wifi, food and culture by international writers living in Japan — save every spot mentioned with one tap. Pick an itinerary from NAVITIME or other app users, or build your own day-by-day plan by placing spots on the map. Whenever you add or reorder spots, transport, travel and waiting times update automatically, with a running total cost. Invite companions to edit with you. Available in 13 languages, with map labels in 5. [Local Support & Booking] Where or when trains don't run, book a taxi from the map or route details. Check the fare estimate and license plate, and send your driver a preset message — no Japanese needed. Pay in the app and see the amount in your home currency. Get earthquake, tsunami, weather and volcano alerts with shelter search, and buy shinkansen tickets and the NAVITIME eSIM in-app. Hotels, passes and activities are bookable too. [Who It's For] - First-time visitors and solo travelers unsure about Japanese station signs and transfers - Pass holders wanting full value from their rail pass - Travelers with heavy luggage, avoiding stairs, or using a wheelchair - Anyone planning a multi-city or rural trip by train, bus and subway [What You Get] - One photo of a departure board confirms you're on the right train — no Japanese reading needed - 100% bus route coverage reaches rural Japan where trains don't go - Know what your pass covers and what costs extra before you board - Which car, which platform, how crowded — stress-free travel days - Find stations, Japan wifi spots, ATMs, currency exchange and rail maps offline - After the last train, call a taxi and identify it by its license plate [Premium] Upgrade via in-app purchase. - Alternative routes during delays - Voice navigation - Timetables and stop lists - Real-time bus location In short: Japan Travel by NAVITIME is a public transport navigation and trip planning app for visitors to Japan, available in 13 languages. Its AI camera feature, Check & Ride, reads a photo of a platform departure board or bus destination sign and tells you whether the train or bus matches your searched route. Free to download, with an optional premium upgrade.
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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
Assumption to check: Complex navigation options can confuse users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Ads can disrupt user experience
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of personalization in recommendations
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.