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
Hearthstone
Battle as legendary Warcraft heroes in Hearthstone®, Blizzard Entertainment's award-winning free-to-play* strategy card game
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
122,580 ratings · Top 30%
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 included18 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 Hearthstone: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Battle as legendary Warcraft heroes in Hearthstone®, Blizzard Entertainment's award-winning free-to-play* strategy card game. Build powerful decks, collect iconic cards, discover game-changing combos, and outsmart opponents in epic card battles! ONE GAME. COUNTLESS WAYS TO PLAY. Whether you're new to collectible card games (CCG) or a seasoned strategist, Hearthstone offers an experience for every kind of player. Challenge friends, test your skills against opponents from around the world, or enjoy solo adventures at your own pace. Every match is packed with opportunities to learn, experiment, and sharpen your skills. Develop strategies that fit your playstyle, craft Legendary cards, and discover new possibilities as your collection grows. Easy to learn and rewarding to master, Hearthstone offers fresh challenges with every game. Play online across mobile and PC with your Hearthstone collection and progress synced between devices. Whether you have a few minutes for a quick match or you're ready to climb the competitive ladder, your next match is always within reach. Collect. Build. Play. CLIMB TO LEGEND • Battle players from around the world in strategic online PvP duels. • Build winning decks, evolve your strategy, and climb all the way to Legend. • Earn seasonal rewards and prove your mastery every month. HONE YOUR CRAFT • Take on solo adventures, complete quests, and discover new mechanics at your own pace. • Draft a unique deck in Arena from a changing selection of cards, then test your strategy against other players. • Returning player? Wild mode lets you play with all your cards! OUTSMART RIVALS • Recruit powerful minions, build your warband, and compete against seven other players in Hearthstone's signature Battlegrounds auto-battler mode. • Adapt every turn, discover powerful synergies, and be the last player standing. • No two matches play the same. EMBRACE THE CHAOS • Jump into Tavern Brawl, where unique rules, unexpected twists, and special rewards keep every Brawl fresh. CHOOSE YOUR HERO • Battle as legendary Warcraft heroes across 11 distinct classes. • Each class features its own Hero Power, signature mechanics, and unique strategies. • Whether you prefer aggressive attacks, careful planning, or clever combos, there's a class for you. Complete quests, earn rewards, and discover new cards with every expansion. Regular balance updates, seasonal events, major expansions, and limited-time experiences keep Hearthstone fresh for newcomers and veterans alike. Experience the magic, mischief, and mayhem in this epic fantasy CCG. Battle friends, challenge online opponents, and join millions of players around the hearth. Play Hearthstone today! *In-game purchases are optional. ©/TM/® 2026 Blizzard Entertainment, Inc
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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
Implement a community feedback system for card adjustments.
Assumption to check: Balancing issues in card strength and strategy
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free rewards and in-game events.
Assumption to check: Monetization pressure can discourage casual players
Validate with people who use this workflow before building.
Hypothesis 3
Create a streamlined onboarding experience.
Assumption to check: Complex tutorial for new players
Validate with people who use this workflow before building.
Hypothesis 4
Improve server infrastructure and matchmaking algorithms.
Assumption to check: Long matchmaking times
Validate with people who use this workflow before building.
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
Supabase
Zustand
React Navigation
React Native Reanimated
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.
