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
Double Tile!
Welcome to Double Tile! Start your brain puzzles journey in this relaxing mahjong match solitaire game.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.8
63,460 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Add to a Remix
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.
What's included16 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 Double Tile!: 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
Offer affordable ad-free tier ($2.99)
Assumption to check: Too many intrusive ads
Validate with people who use this workflow before building.
Hypothesis 2
Cosmetic-only purchases, skill-based progression
Assumption to check: Pay-to-win mechanics
Validate with people who use this workflow before building.
Hypothesis 3
Add battery saver mode, optimize rendering
Assumption to check: Battery drain
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
Welcome to Double Tile! Start your brain puzzles journey in this relaxing mahjong match solitaire game. Double Tile! is a classic mahjong matching puzzle game with large tiles which blends mindful strategy with calming, healing atmosphere. It transforms the classic Mahjong experience into a relax puzzle retreat, inviting players to unwind, refocus, and find peace every mahjong match they make. How to Play Double Tile! · Objective: Clear the board by matching identical tiles. A tile is matchable when free on one side, and not covered by another tile. · Gameplay: Tap two matching tiles to remove them. As the obvious tiles disappear, mahjong match will become more challenging. Planning ahead is a good approach to avoid dead ends. · Helpful Tools: Click limited power-ups like ‘Hints’. It helps to reveal available mahjong match or Shuffles to rearrange tiles. Block game can be both puzzle and relaxing. Unique Features of Double Tile! · Modern & Clear Design: Enjoy extra-large, high-contrast tiles that are easy to read and satisfying to pop. The free mahjong games create a soft, inviting mahjong solitaire world. · Soothing Audio: Gentle melodies and nature sounds—rainfall, rustling leaves, or distant streams—accompanying you to achieve every mahjong match in this puzzle blast game—immerse players in tranquility with relaxing puzzles. Ready to Relax? Whether you’re seeking a mindful break or a moment of quiet focus, Double Tile! offers an uplifting way to relax and recharge through the mahjong solitaire journey. Download now to discover the joy of unwinding with Double Tile! We hope every puzzle lover enjoys this Zen mahjong experience.
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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
Unity
Firebase
AdMob
RevenueCat
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.
