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
Whiteout Survival
The world's original winter-themed mobile game! Over 400M players!
Free · In-app purchases
OVERALL US RANK
#29
Grossing · all categories
REVENUE (Est)
$1.3M/mo
$749K - $1.8M
RATING
★ 4.6
461,333 ratings · Top 15%
Evidence scope: #29 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.
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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 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 Whiteout Survival: 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
Implement better sorting and filtering options in the inventory.
Assumption to check: Players report difficulty in resource management and inventory overflow.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance map usability with clear markers and tooltips.
Assumption to check: Some users find the map navigation confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce more varied challenges and events to keep gameplay fresh.
Assumption to check: Game can become repetitive after extended play.
Validate with people who use this workflow before building.
Hypothesis 4
Improve transparency and user control over in-app purchases.
Assumption to check: In-app purchases can be unclear and pushy.
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 world's original winter-themed mobile game! Over 400M players! The blizzard has reset the world, and now, a new story awaits your touch! As a rising survivor, gather your crew and team up with the free SSR hero Molly. Together, you'll set out on a joyful adventure, spark the fire of hope, and rebuild a cozy home on the frozen frontier! [Game Features] ◆Rebuild & Restore: Easy Progress Warmth begins with a single spark. Fire up the furnace to melt the snow and reclaim the land! Manage your people and resources to build a bustling, welcoming town! ◆Idle & Earn: Constant Rewards Send your heroes out with one tap, then come back to a pile of resources ready for your next big upgrade, all stress-free. ◆Tap & Play: Instant Fun Go ice fishing for rare catches or uncover hidden treasures beneath the snow. Perfect for quick, fun sessions anytime! ◆Plan & Pair: Heroic Combos All heroes share the same level, so you can upgrade and swap without the grind. Mix and match their skills for ultimate combos! ◆Unite & Triumph: Shared Success Join an alliance to heal faster, grow stronger, and explore further. Together, we share the chill and the cheer! Ready to thrive in the frost? Download Whiteout Survival now — a perfect survival experience blending teamwork, idle fun, and smart strategy! [Follow Us] Official Website: https://whiteoutsurvival.centurygames.com Facebook: https://www.facebook.com/WhiteoutSurvival Discord: https://discord.gg/whiteoutsurvival YouTube: https://www.youtube.com/@WhiteoutSurvivalOfficial TikTok: https://www.tiktok.com/@whiteoutsurvivalofficial X: https://x.com/WOS_Global Instagram: https://www.instagram.com/whiteoutsurvival Threads: https://www.threads.com/@whiteoutsurvival
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 Native
Expo
Supabase
Zustand
react-navigation
expo-location
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.
