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.
Mahjong is an enjoyable game, played around the world
$0.99 · 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.
Kit ready. Verify your email to download it.
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.
JavaScript is required to complete mailbox verification.
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Mahjong Helper & Calculator: map the core Entertainment workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Affiliate link: CloneChart may earn a commission at no extra cost
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 features for advanced scoring calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance on older devices
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.
Mahjong is an enjoyable game, played around the world. However, for beginners (and even more experienced players!), calculating the value of a hand can be confusing. On top of that, payments between players after the value of each hand is calculated can also be tricky. Mahjong Helper aims to simplify the tasks of scoring and payments between games. It can also be used to keep a history of matches played, and to easily experiment with different methods of scoring. Features: * Multiple Matches * Beautiful, easy-to-read tiles. * Hand Scorer with intuitive tile/set-type selector (press, slide, and release to choose a tile) * Supports European Classical, Hong Kong, Japanese Modern / EMF Riichi (with Dora tiles and Red Fives), and Chinese Official (MCR / Competition) scoring * 4, 3, and 2 player scoring modes * Send scores from Hand Scorer to Score Sheet, or enter scores manually. * Score Sheet calculates payments between players, supports "Ready" declarations and counters in Japanese Mahjong. * see how the score is calculated on the "Scoring" panel - great for those learning the game, or just to double-check! * Supports seat rotation between rounds, or groups that prefer keeping the same positions throughout. * Share matches across devices - other players can keep a record of the match & contribute to scoring from their own devices. Requires a data connection. * Print score sheets to your AirPrint-enabled printer! I hope you like it!
Written user reviews are not shown here. Check current App Store reviews >
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.