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
Rummikub®
the original rummikub version (not rummy nor rummy cube or okey) is one of the most popular family games in the world
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.3
741 ratings · Below Average
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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Rummikub®: map the core Games 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
Create a cleaner and more organized UI with clear navigation.
Assumption to check: User interface is cluttered and confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize game performance for smoother multiplayer experiences.
Assumption to check: Performance issues during multiplayer games.
Validate with people who use this workflow before building.
Hypothesis 3
Implement clearer in-app purchase options and better user education.
Assumption to check: In-app purchases can be confusing and not transparent.
Validate with people who use this workflow before building.
Hypothesis 4
Expand game modes and provide more customization options for players.
Assumption to check: Limited player options and modes.
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
the original rummikub version (not rummy nor rummy cube or okey) is one of the most popular family games in the world. the unique combination of tactical thinking, luck and tense competition has made this classic family game to one of the most successful games for the past 70 years! arrange the tiles to create the smartest color and numbers combinations. will you be the first player to place all tiles and win the match? * download now and play as much as you want. get free access to all game modes and features. * no ads! no commercials! * play the classic rummikub game online with your friends, family or players from all around the world. * you can choose to connect with your facebook account, game center or as a guest. single play play against computer players (also available offline). set the turn time, opponents number and difficulty level. play now play online with millions of rummikub players from all around the world and try to win as many points as you can to become the rummikub master! custom game create a public table with your own preferences; number of players, turn time and entry fee. private game invite friends and family members to play! create private tables and choose your own personal game settings. you can see which of your friends are online from your facebook's friendlist and invite them to join you to play a fun classic rummikub game. includes 10 supported languages - english, german, french, dutch, korean, chinese, spanish, polish, turkish and portuguese. experienced a problem? got a suggestion? you can reach us at [email protected]
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 Navigation
Zustand
Expo
React Native Gesture Handler
React Native Reanimated
Supabase
BUILD KIT DIFFICULTY
Expert
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.
