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
Royal Match
King Robert needs your help to restore Royal Castle’s former glory
Free · In-app purchases
OVERALL US RANK
#9
Grossing · all categories
REVENUE (Est)
$3.5M/mo
$2.1M - $4.9M
RATING
★ 4.7
3,822,831 ratings · Top 15%
Evidence scope: #9 is the current overall US Grossing chart position. 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.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
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/
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.
JavaScript is required to complete mailbox verification.
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 Royal Match: map the core Games 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.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 new level types and mechanics regularly.
Assumption to check: Levels can become repetitive over time.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly ad experience.
Assumption to check: Ad frequency can disrupt gameplay.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance friend interactions and leaderboards.
Assumption to check: Limited social features for friends.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify value in purchasing options and improve transparency.
Assumption to check: In-app purchases can be misleading.
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
King Robert needs your help to restore Royal Castle’s former glory. Break the obstacles and combine amazing power-ups to beat joyful and challenging levels! Keep unlocking wonderful areas by playing fun match-3 levels! Come along now and join the fun! Once you play, you will come for Royal Match every day! Royal Match features: • A new unique taste in match-3 levels with amusing obstacles and fun levels! • Collect loads of coins in bonus levels! • Lots of powerful boosters await for you to unlock them! • Open amazing chests to win magnificent rewards! • Restore the Royal Castle into an amazing and wonderful place! • Explore the new rooms, royal chambers, splendid gardens, and many more exciting areas!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Zustand
React Navigation
Firebase
Lottie
BUILD KIT DIFFICULTY
Advanced
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.
