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.
Japanese Mahjong (Riichi Mahjong) is a popular tabletop game, but its complex rules make it difficult for many players to accurately calculate the number of han and scores
$4.99 · 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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Generating… usually about a minute.
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 Mahjong Win!: map the core Entertainment 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: Limited game modes compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Slow loading times for game assets
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features like chat
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulty in navigating between game modes
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.
Japanese Mahjong (Riichi Mahjong) is a popular tabletop game, but its complex rules make it difficult for many players to accurately calculate the number of han and scores. To solve this problem, we have developed "Mahjong Win! - Smart Japanese Mahjong Helper" to help everyone play face-to-face with friends. Mahjong Win! is a powerful and practical Mahjong assistant app, whose main function is to quickly and accurately calculate the number of han, fu, and scores for players based on photos taken of the playing table. Whether you are a beginner or an experienced player, after using our application, you will be able to enjoy the fun of Japanese Mahjong more conveniently. [Features] • Tile recognition: Using artificial intelligence technology, our app can intelligently recognize the tiles on the photos, including numbers, suits, and wind directions, to ensure accurate display. • Yaku identification: Yaku is an important indicator for calculating scores in Japanese Mahjong. Our application can automatically analyze the player's hand tiles and melds, and quickly identify yakuman based on the rules, allowing you to focus on the game itself. • Number of han and fu: Our application can automatically calculate the number of han and fu based on factors such as tile patterns and yaku, avoiding tedious manual calculations and saving time and effort. • Score calculation: Score calculation in Japanese Mahjong is extremely complicated. Our app can accurately calculate the score for you, making game settlement easier and allowing you to enjoy the joy of winning. [Highlights] • User-friendly interface: Our application has a simple and intuitive user interface, making operations easier and more natural. No need for complicated settings, just take photos to enjoy the convenient services of calculating number of han, fu, and scores. • Powerful tile recognition: Our AI algorithm has been carefully trained to efficiently and accurately recognize common Mahjong tiles. • Extraordinary calculation efficiency: With the built-in efficient AI recognition and calculation engine, our software can run locally quickly, saving a lot of time and allowing you to focus more on the game experience. • Timely updates: Our team will continue to improve and enhance the functionality of the application, adding more auxiliary functions. If you have any suggestions, welcome to communicate with us through the in-app feedback. After using the "Mahjong Win!" assistant, we hope you will experience the great convenience brought by the powerful features of this application. Whether you are a beginner or an expert in Japanese Mahjong, we sincerely hope that "Mahjong Win!" can bring you fun and the joy of success in your game journey, and enjoy pleasant matches with friends!
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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.