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.
・GO is most used Taxi App(Taxi booking app)in Japan
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 GO / Taxi app for Japan: 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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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: Users experience long wait times for rides during peak hours.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited payment options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app navigation can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Customer support response times are slow.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
・GO is most used Taxi App(Taxi booking app)in Japan GO is Japan's No.1 App (cab app) with the most extensive service coverage, available in all 47 prefectures across Japan! Coverage extends to all major tourist areas, such as Hokkaido, Tokyo, Kyoto, Osaka, Fukuoka, and Okinawa. * Sourced from data.ai by Sensor Tower - Number of Taxi App(cab app) downloads in Japan - Survey period: October 1, 2020 - Mar 31, 2026 - Among the top 5 Taxi Apps in Japan, GO has an 80% market share of total usage time. - Survey period: January 1, 2021 - Mar 31, 2026 *Actual app screen may differ. ・Travel around Japan easily with GO Use GO to hail the nearest Taxi(cab) to get to your destination easily. No more having to stand on the side of the road waiting for one to go by! - Go easy anywhere on time - Stress-free Taxi(cab) experience - Best Taxi(cab) type selection ・From hail to payment in one app by using GO Do everything from hailing a Taxi(cab), to confirming your ride and paying your fare in the GO app, and go easy anywhere in Japan. ・GO PREMIUM: Request a large luxury van With the GO app you can easily request a professional, highly-rated driver to pick you up in a luxury van with seating for up to six. This service is currently available in the following 15 wards of Tokyo: Chiyoda-ku, Chuo-ku, Minato-ku, Shinjuku-ku, Bunkyo-ku, Taito-ku, Sumida-ku, Koto-ku, Shinagawa-ku, Meguro-ku, Ota-ku, Setagaya-ku, Shibuya-ku, Nakano-ku, Toshima-ku *Not available in portions of Taito-ku, Sumida-ku, Koto-ku, Shinagawa-ku, Ota-ku, Setagaya-ku, Nakano-ku and Toshima-ku. Visit the webpage below for details. https://go.goinc.jp/en/premium ・Reservation Service: Reserve a Taxi for a specific date and time Our Reservation Service automatically hails a Taxi for you on the date and time you specify. Reservations can be made from 15 minutes to 7 days in advance. A service charge will apply in addition to the Taxi fare at the time of payment. *While limited to certain urban areas, new areas being added all the time. ・Airport Flat-rate Get flat-rate fares from a location you specify, such as your home, hotel, a train station or travel destination to select airports. With GO there is no need to make reservations in advance: you can take advantage of this flat-rate even if you want to hail a Taxi right away. Currently available for: boarding from Tokyo - Haneda/ Narita Airport (Tokyo - Narita is only transfer to the airport). ・Pay your fare cashlessly with GO Pay while you ride Pay for your fare automatically by adding your credit card in the app and choosing GO Pay in the Taxi. When you arrive at your destination just get out. No more time wasted dealing with change or credit cards. *Not available in all Taxis ・Advance Destination Setting With this feature, you can hail a Taxi and set your destination ahead of time. This eliminates having to explain your destination to the driver, so there is no need to worry if you cannot communicate in Japanese. ・Confirmation Number Give this number to the driver when your Taxi arrives, then get in. You no longer have to worry about finding your Taxi and being sure you are getting in the right one. ・Tipping Feature Show your appreciation to your driver by giving them a tip. You can give tips at the end of the ride from the rating screen or from "Usage History / Receipt" in the GO app's menu. *Tips are optional. [Notes for using GO] - If there are no available cars nearby, we may not be able to dispatch a car. - In addition to fare and pickup fee, GO App charge will apply in some areas. - Credit cards accepted: Visa / Mastercard / JCB / American Express / Diners Club - Estimated arrival time is based on current conditions and these may change depending on traffic and other factors. - Please note that the car request may be cancelled after it has been accepted due to traffic or other reasons. - Location and push notification permission must be turned on when using this service.
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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.