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
Phase 10: Casual Card Game
Start playing Phase 10 for FREE TODAY - The fun and classic mobile card game enjoyed by millions of players around the world.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
575,167 ratings · Top 5%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Phase 10: Casual Card Game: 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
Introduce more game modes for variety.
Assumption to check: Limited game modes and variations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a matchmaking system for faster game starts.
Assumption to check: Long wait times for players to join games
Validate with people who use this workflow before building.
Hypothesis 3
Add a tutorial or guide for new users.
Assumption to check: Complexity in understanding phases for new players
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free premium subscription option.
Assumption to check: Frequent ads interrupt gameplay
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
Start playing Phase 10 for FREE TODAY - The fun and classic mobile card game enjoyed by millions of players around the world. Phase 10 in the newest rummy inspired card game brought to you from the creators of UNO! bringing friends and families together for over 40 years. There's nothing more convenient and perfect for any card or party game lovers! Take 10 minutes for yourself and enjoy a quick round of Phase 10 anytime! It's always a good time to play Phase 10! HOW TO PLAY PHASE 10? Race to complete each “Phase” and stay ahead. Every Phase has its own sets of cards to match their colors and numbers. When you have your sets, throw them down for everyone to see. The round ends when one player frees their hand of all their cards. Everyone who completes the Phase moves on to the next challenge. Players who can’t finish the Phase start over and try again. DAILY CHALLENGES Train your brain daily with new puzzles on every level. Watch carefully for patterns and outwit the game. Unlock new rules to explore and solve and become a Phase 10 master! PLAY OFFLINE Take your dream vacation and travel around the world in Journey mode! Play offline and relax in zen-like solitaire challenges. Use Power-Ups to get an edge and win rewards! Phase 10 is a blast! COMPETE WITH THE COMMUNITY Compete with others online to win coins and be part of the international community. Skip the airport and explore faraway places! Phase 10 tours from the comfort of a Pacific paradise to the chilling extremes of the ice capped mountains! See if you can stand atop the world! MONTHLY EVENTS Keep things fresh by playing in a new themed event every month! Roll the dice, collect new materials, send gifts to friends, and more! There's always a new way to play. Phase 10 has fun in spades! There's always something new to explore! Don't miss out on this addictive rummy card game! DOWNLOAD NOW and start an exciting card adventure for endless fun!
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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 Native
Expo
Firebase
Redux
React Navigation
AdMob
BUILD KIT DIFFICULTY
Intermediate
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.
